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super sequencer with margining control a nd non-volatile fault recording preliminary technical data adm1169 rev. pr. a information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2010 analog devices, inc. all rights reserved. features complete supervisory and sequencing solution for up to 8 supplies 16 event deep black box nonvolatile fault recording 8 supply fault detectors enable supervision of supplies to <0.5% accuracy at all voltages at 25c <1.0% accuracy across all voltages and temperatures 4 selectable input attenuators allow supervision of supplies to 14.4 v on vh 6 v on vp1 to vp3 (vpx) 4 dual-function inputs, vx1 to vx4 (vxx) high impedance input to supply fault detector with thresholds between 0.573 v and 1.375 v general-purpose logic input 8 programmable driver outputs, pdo1 to pdo8 (pdox) open-collector with external pull-up push/pull output, driven to vddcap or vpx open-collector with weak pull-up to vddcap or vpx internally charge-pumped high drive for use with external n-fet (pdo1 to pdo6 only) sequencing engine (se) implements state machine control of pdo outputs state changes conditional on input events enables complex control of boards power-up and power-down sequence control fault event handling interrupt generation on warnings watchdog function can be integrated in se program software control of sequencing through smbus complete voltage margining solution for 4 voltage rails 4 voltage output 8-bit dacs (0.300 v to 1.551 v) allow voltage adjustment via dc-to-dc converter trim/feedback node 12-bit adc for readback of all supervised voltages reference input (refin) has 2 input options driven directly from 2.048 v (0.25%) refout pin more accurate external reference for improved adc performance device powered by the highest of vpx, vh for improved redundancy user eeprom: 256 bytes industry-standard 2-wire bus interface (smbus) guaranteed pdo low with vh, vpx = 1.2 v available in 32-lead, 7 mm 7 mm lqfp and 40-lead, 6 mm 6 mm lfcsp packages for more information about the adm1169 register map, refer to the an-721 application note at www.analog.com functional block diagram 04735-001 pdo7 pdo8 pdognd vddcap vdd arbitrator dac1 v out dac dac2 v out dac dac3 v out dac dac4 v out dac gnd vccp vx1 vx2 vp1 vp2 vp3 vh a gnd programmable reset generators (sfds) configurable output drivers (lv capable of driving logic signals) pdo1 pdo2 pdo3 pdo4 pdo5 pdo6 vx3 vx4 sda scl a1 a0 smbus interface refin refout refgnd vref 12-bit sar adc mux eeprom closed-loop margining system adm1169 dual- function inputs (logic inputs or sfds) sequencing engine configurable output drivers (hv capable of driving gates of n-fet) fault recording figure 1. applications central office systems s ervers/routers multivoltage system line cards dsp/fpga supply sequencing in-circuit testing of margined supplies general description the adm1169 super sequencer? is a configurable supervisory/ s equencing device that offers a single-chip solution for supply monitoring and sequencing in multiple supply systems. in addition to these functions, the adm1169 integrates a 12-bit adc and four 8-bit voltage output dacs. these circuits can be used to implement a closed-loop margining system that enables supply adjustment by altering either the feedback node or reference of a dc-to-dc converter using the dac outputs.
adm1169 preliminary technical data rev. pr. a | page 2 of 37 table of contents features .............................................................................................. 1 functional block diagram .............................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 revision history ............................................................................... 2 detailed block diagram .................................................................. 3 specifications ..................................................................................... 4 absolute maximum ratings ............................................................ 7 thermal resistance ...................................................................... 7 esd caution .................................................................................. 7 pin configurations and function descriptions ........................... 8 typical performance characteristics ........................................... 10 powering the adm1169................................................................. 13 inputs ................................................................................................ 14 supply supervision ..................................................................... 14 programming the supply fault detectors ............................... 14 input comparator hysteresis .................................................... 15 input glitch filtering ................................................................. 15 supply supervision with vxx inputs ....................................... 15 vxx pins as digital inputs ........................................................ 16 outputs ............................................................................................ 17 supply sequencing through configurable output drivers . 17 default output configuration .................................................. 17 sequencing engine ......................................................................... 19 overview ...................................................................................... 19 warnings ...................................................................................... 19 smbus jump (unconditional jump) ........................................ 19 sequencing engine application example ............................... 20 fault and status reporting ........................................................ 21 nonvolatile black box fault recording................................... 22 black box writes with no external supply ............................ 22 voltage readback ........................................................................... 23 supply supervision with the adc ........................................... 23 supply margining ........................................................................... 24 overview ..................................................................................... 24 open-loop supply margining ................................................. 24 closed-loop supply margining ............................................... 24 writing to the dacs .................................................................. 25 choosing the size of the attenuation resistor ....................... 25 dac limiting and other safety features ............................... 26 applications diagram .................................................................... 27 communicating with the adm1169 ........................................... 28 configuration download at power-up ................................... 28 updating the configuration ..................................................... 28 updating the sequencing engine ............................................. 29 internal registers ........................................................................ 29 eeprom ..................................................................................... 29 serial bus interface..................................................................... 30 smbus protocols for ram and eeprom .............................. 33 write operations ........................................................................ 33 read operations ......................................................................... 35 outline dimensions ....................................................................... 36 ordering guide .......................................................................... 36 revision history 11/10revision pra.: preliminary version
preliminary technical data adm1169 rev. pr. a | page 3 of 37 supply margining can be performed with a minimum of external c omponents. the margining loop can be used for in-circuit testing of a board during production (for example, to verify board functionality at ?5% of nominal supplies), or it can be used dynamically to accurately control the output voltage of a dc-to-dc converter. the device also provides up to eight programmable inputs for monitoring undervoltage faults, overvoltage faults, or out-of- window faults on up to eight supplies. in addition, there are eight programmable outputs that can be used as logic enables. six of these programmable outputs can also provide up to a 12 v output for driving the gate of an n-fet that can be placed in the path of a supply. the logical core of the device is a sequencing engine (se). this state machine-based construction provides up to 63 different states. this design enables very flexible sequencing of the outputs, based on the condition of the inputs. a block of nonvolatile eeprom is available that can be used to store user-defined information and may also be used to hold a number of fault records that are written by the sequencing engine defined by the user when a particular fault or sequence occurs. the adm1169 is controlled via configuration data that can be programmed into an eeprom. the entire configuration can be programmed using an intuitive gui-based software package provided by analog devices, inc. detailed block diagram 04735-002 gpi signal conditioning sfd gpi signal conditioning sfd sfd sfd selectable attenuator selectable attenuator device controller osc eeprom sda scl a1 a0 smbus interface refout refin refgnd vref 12-bit sar adc adm1169 configurable output driver (hv) pdo1 pdo2 pdognd pdo3 vccp gnd pdo4 pdo5 configurable output driver (hv) pdo6 configurable output driver (lv) pdo7 configurable output driver (lv) pdo8 sequencing engine vx2 vx3 vp2 vp3 vh vp1 vx1 agnd vx4 vdd arbitrator reg 5.25v charge pump dac1 v out dac d ac4 v out dac d ac2 dac3 v ddcap figure 2. detailed block diagram
adm1169 preliminary technical data rev. pr. a | page 4 of 37 specifications vh = 3.0 v to 14.4 v, 1 vpx = 3.0 v to 6.0 v, 1 t a = ?40c to +85c, unless otherwise noted. table 1. parameter m in typ max unit test conditions/comments power supply arbitration vh, vpx 3.0 v minimum supply required on one of vh, vpx vpx 6.0 v maximum vddcap = 5.1 v, typical vh 14.4 v vddcap = 4.75 v vddcap 2.7 4.75 5.4 v regulated ldo output c vddcap 10 f minimum recommended decoupling capacitance power supply supply current, i vh , i vpx 4.2 6 ma vddcap = 4.75 v, pdo1 to pdo8 off, dacs off, adc off additional currents all pdox fet drivers on 1 ma vddcap = 4.75 v, pdo1 to pdo6 loaded with 1 a each, pdo7 to pdo8 off current available from vddcap 2 ma maximum additional load that can be drawn from all pdo pull-ups to vddcap dac supply currents 2.2 ma four dacs on with 100 a maximum load on each adc supply current 1 ma running round-robin loop eeprom erase current 10 ma 1 ms duration only, vddcap = 3 v supply fault detectors vh pin input impedance 52 k input attenuator error 0.05 % midrange and high range detection ranges high range 6 14.4 v midrange 2.5 6 v vpx pins input impedance 52 k input attenuator error 0.05 % low range and midrange detection ranges midrange 2.5 6 v low range 1.25 3 v ultralow range 0.573 1.375 v no input attenuation error vxx pins input impedance 1 m detection ranges ultralow range 0.573 1.375 v no input attenuation error absolute accuracy 1 % vref error + dac nonlinearity + comparator offset error threshold resolution 8 bits digital glitch filter 0 s minimum programmable filter length 100 s maximum programmable filter length
preliminary technical data adm1169 rev. pr. a | page 5 of 37 parameter m in typ max unit test conditions/comments analog-to-digital converter signal range 0 v refin v the adc can convert signals presented to the vh, vpx, and vxx pins; vpx and vh input signals are attenuated depending on the selected range; a signal at the pin corresponding to the selected range is from 0.573 v to 1.375 v at the adc input input reference voltage on refin pin, v refin 2.048 v resolution 12 bits inl 2.5 lsb endpoint corrected, v refin = 2.048 v gain error 0.05 % v refin = 2.048 v conversion time 0.44 ms one conversion on one channel 84 ms all eight channels selected, averaging enabled offset error 2 lsb v refin = 2.048 v input noise 0.25 lsb rms direct input (no attenuator) buffered voltage output dacs resolution 8 bits code 0x80 output voltage four dacs are individually selectable for centering on one of four output voltage ranges range 1 0.592 0.6 0.603 v range 2 0.796 0.8 0.803 v range 3 0.996 1 1.003 v range 4 1.246 1.25 1.253 v output voltage range 601.25 mv same range, independent of center point lsb step size 2.36 mv inl 0.75 lsb endpoint corrected dnl 0.4 lsb gain error 1 % maximum load current (source) 100 a maximum load current (sink) 100 a maximum load capacitance 50 pf settling time into 50 pf load 2 s load regulation 2.5 mv per ma psrr 60 db dc 40 db 100 mv step in 20 ns with 50 pf load reference output reference output voltage 2.043 2.048 2.053 v no load load regulation ?0.25 mv sourcing current, i dacxmax = ?100 a +0.25 mv sinking current, i dacxmax = +100 a minimum load capacitance 1 f capacitor required for decoupling, stability psrr 60 db dc programmable driver outputs high voltage (charge pump) mode (pdo1 to pdo6) output impedance 500 k v oh 11 12.5 14 v i oh = 0 a 10.5 12 13.5 v i oh = 1 a i outavg 20 a 2 v < v oh < 7 v
adm1169 preliminary technical data rev. pr. a | page 6 of 37 parameter m in typ max unit test conditions/comments standard (digital output) mode (pdo1 to pdo8) v oh 2.4 v v pu (pull-up to vddcap or vpx) = 2.7 v, i oh = 0.5 ma 4.5 v v pu to vpx = 6.0 v, i oh = 0 ma v pu ? 0.3 v v pu 2.7 v, i oh = 0.5 ma v ol 0 0.50 v i ol = 20 ma i ol 2 20 ma maximum sink current per pdox pin i sink 2 60 ma maximum total sink for all pdox pins r pull-up 16 20 29 k internal pull-up i source (vpx) 2 2 ma current load on any vpx pull-ups, that is, total source current available through any number of pdo pull-up switches configured onto any one vpx pin three-state output leakage current 10 a v pdo = 14.4 v oscillator frequency 90 100 110 khz all on-chip time delays derived from this clock digital inputs (vxx, a0, a1) input high voltage, v ih 2.0 v maximum v in = 5.5 v input low voltage, v il 0.8 v maximum v in = 5.5 v input high current, i ih ?1 a v in = 5.5 v input low current, i il 1 a v in = 0 v input capacitance 5 pf programmable pull-down current, i pull-down 20 a vddcap = 4.75 v, t a = 25c, if known logic state is required serial bus digital inputs (sda, scl) input high voltage, v ih 2.0 v input low voltage, v il 0.8 v output low voltage, v ol 2 0.4 v i out = ?3.0 ma serial bus timing clock frequency, f sclk 400 khz bus free time, t buf 1.3 s start setup time, t su;sta 0.6 s stop setup time, t su;sto 0.6 s start hold time, t hd;sta 0.6 s scl low time, t low 1.3 s scl high time, t high 0.6 s scl, sda rise time, t r 300 s scl, sda fall time, t f 300 s data setup time, t su;dat 100 ns data hold time, t hd;dat 250 ns input low current, i il 1 a v in = 0 v sequencing engine timing state change time 10 s 1 at least one of the vh, vpx pins must be 3.0 v to maintain the device supply on vddcap. 2 specification is not production tested but is supported by characterization data at initial product release.
preliminary technical data adm1169 rev. pr. a | page 7 of 37 absolute maximum ratings table 2. parameter r ating voltage on vh pin 16 v voltage on vpx pins 7 v voltage on vxx pins ?0.3 v to +6.5 v voltage on a0, a1 pins ?0.3 v to +7 v voltage on refin, refout pins 5 v voltage on vddcap, vccp pins 6.5 v voltage on dacx pins 6.5 v voltage on pdox pins 16 v voltage on sda, scl pins 7 v voltage on gnd, agnd, pdognd, refgnd pins ?0.3 v to +0.3 v input current at any pin 5 ma package input current 20 ma maximum junction temperature (t j max) 150c storage temperature range ?65c to +150c lead temperature soldering vapor phase, 60 sec 215c esd rating, all pins 2000 v stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 3. thermal resistance package type ja unit 32-lead lqfp 54 c/w 40-lead lfcsp 26.5 c/w esd caution
adm1169 preliminary technical data rev. pr. a | page 8 of 37 pin configurations and function descriptions 04735-003 1 24 25 32 8 9 17 16 v x1 v x2 v x3 v x4 v p1 v p2 v p3 vh pdo1 pdo2 pdo3 pdo4 pdo5 pdo6 pdo7 pdo8 gnd vddcap sda scl a1 a0 vccp pdogn d agnd refgnd refin refout dac1 dac2 dac3 dac4 pin 1 indicator adm1169 top view ( not to scale) 04735-004 agnd r efgnd refin refout nc nc dac1 dac2 dac3 dac4 nc vx1 vx2 vx3 vx4 nc vp1 vp2 vp3 vh pdo1 pdo2 pdo3 pdo4 pdo5 pdo6 pdo7 pdo8 nc nc pin 1 indicator notes 1. nc = no connect. 2. the lfcsp has an exposed pad on the bottom. this pad is a no connect (nc). if possible, this pad should be soldered to the board for improved mechanical stability. 1 2 3 4 5 6 7 8 9 10 23 24 25 26 27 28 29 30 22 21 1 1 1 2 1 3 1 5 1 7 1 6 1 8 1 9 2 0 1 4 3 3 a 0 3 4 a 1 3 5 s c l 3 6 s d a 3 7 n c 3 8 n c 3 9 v d d c a p 4 0 g n d 3 2 v c c p 3 1 p d o g n d top view (not to scale) adm1169 figure 3. 32-lead lqfp pin configuration figure 4. 40-lead lfcsp pin configuration table 4. pin function descriptions e.ord:py/vr q o/p o.3r 2/l3v.4a. orr gh5er g58fe d r 1, 6, 15, 16, 21, 22, 37, 38 nc no connect. 1 to 4 2 to 5 vx1 to vx4 (vxx) high impedance inputs to supply fault detectors. fault thresholds can be set from 0.573 v to 1.375 v. alternatively, these pins can be used as general-purpose digital inputs. 5 to 7 7 to 9 vp1 to vp3 (vpx) low voltage inputs to supply fault detectors. three input ranges can be set by altering the input attenuation on a potential divider connected to these pins, the output of which connects to a supply fault detector. these pins allow thresholds from 2.5 v to 6.0 v, from 1.25 v to 3.00 v, and from 0.573 v to 1.375 v. 8 10 vh high voltage input to supply fault detectors. three input ranges can be set by altering the input attenuation on a potential divider connected to this pin, the output of which connects to a supply fault detector. this pin allows thresholds from 6.0 v to 14.4 v and from 2.5 v to 6.0 v. 9 11 agnd 2 ground return for input attenuators. 10 12 refgnd 2 ground return for on-chip reference circuits. 11 13 refin reference input for adc. nominally, 2.048 v. this pin must be driven by a reference voltage. the on-board reference can be used by connecting the refout pin to the refin pin. this is the normal configuration. 12 14 refout 2.048 v reference output. a reservoir capacitor must be connected between this pin and gnd. a 10 f capacitor is recommended for this purpose. 13 to 16 17 to 20 dac1 to dac4 voltage output dacs. these pins default to high impedance at power-up. 17 to 24 23 to 30 pdo8 to pdo1 programmable output drivers. 25 31 pdognd 2 ground return for output drivers. 26 32 vccp central charge-pump voltage of 5.25 v. a reservoir capacitor must be connected between this pin and gnd. a 10 f capacitor is recommended for this purpose. 27 33 a0 logic input. this pin sets the seventh bit of the smbus interface address. 28 34 a1 logic input. this pin sets the sixth bit of the smbus interface address.
preliminary technical data adm1169 rev. pr. a | page 9 of 37 pin number m nemonic description lqfp lfcsp 1 29 35 scl smbus clock pin. bidirectional open drain requires external resistive pull-up. 30 36 sda smbus data pin. bidirectional open drain requires external resistive pull-up. 31 39 vddcap device supply voltage. linearly regulated from the highest of the vpx and vh pins to a typical of 4.75 v. note that a capacitor must be connected between this pin and gnd. a 10 f capacitor is recommended for this purpose. 32 40 gnd 2 supply ground. n/a epad exposed pad. this pad is a no connect (nc). if possible, this pad should be soldered to the board for improved mechanical stability. 1 the lfcsp has an exposed pad on the bottom. this pad is a no connect (nc). if possible, this pad should be soldered to the board for improved mechanical stability. 2 in a typical application, all ground pins are connected together.
adm1169 preliminary technical data rev. pr. a | page 10 of 37 typical performance characteristics 6 0 1 2 3 4 5 0 6 5 4 3 2 1 04735-050 v vp1 (v) v vddcap (v) figure 5. v vddcap vs. v vp1 6 0 1 2 3 4 5 0 161412108642 04735-051 v vh (v) v vddcap (v) figure 6. v vddcap vs. v vh 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 3 4 5 6 04735-052 v vp1 (v) i vp1 (ma) figure 7. i vp1 vs. v vp1 (vp1 as supply) 180 160 140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 04735-053 v vp1 (v) i vp1 (a) figure 8. i vp1 vs. v vp1 (vp1 not as supply) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 161412108642 04735-054 v vh (v) i vh (ma) figure 9. i vh vs. v vh (vh as supply) 350 300 250 200 150 100 50 0 0 6 5 4 3 2 1 04735-055 v vh (v) i vh (a) figure 10. i vh vs. v vh (vh not as supply)
preliminary technical data adm1169 rev. pr. a | page 11 of 37 14 12 10 8 6 4 2 0 0 15.0 12.5 10.0 7.5 5.0 2.5 04735-056 i load (a) charge-pumped v pdo1 (v) figure 11. charge-pumped v pdo1 (fet drive mode) vs. i load 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 6 5 4 3 2 1 04735-057 i load (ma) v pdo1 (v) vp1 = 5v vp1 = 3v figure 12. v pdo1 (strong pull-up to vpx) vs. i load 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 60 50 40 30 20 10 04735-058 i load (a) v pdo1 (v) vp1 = 5v vp1 = 3v figure 13. v pdo1 (weak pull-up to vpx) vs. i load 1.0 ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 4000 1000 2000 3000 0 04735-066 code dnl (lsb) figure 14. dnl for adc 1.0 ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 0 4000 3000 2000 1000 04735-063 code inl (lsb) figure 15. inl for adc 12000 10000 8000 6000 4000 2000 0 2049 2048 2047 04735-064 code hits per code 81 9894 25 figure 16. adc noise, midcode input, 10,000 reads
adm1169 preliminary technical data rev. pr. a | page 12 of 37 04735-059 ch1 200mv m1.00s ch1 756mv 1 dac buffer output probe point 47pf 20k figure 17. transient response of dac code change into typical load 04735-060 ch1 200mv m1.00s ch1 944mv 1 dac buffer output 1v probe point 100k figure 18. transient response of dac to turn-on from high-z state 1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 ?40 ?20 0 20 40 60 100 80 04735-065 temperature ( c) dac output vp1 = 3.0v vp1 = 4.75v figure 19. dac output vs. temperature 2.058 2.038 2.043 2.048 2.053 ?40 ?20 0 20 40 60 100 80 04735-061 temperature ( c) refout (v) vp1 = 3.0v vp1 = 4.75v figure 20. refout vs. temperature
preliminary technical data adm1169 rev. pr. a | page 13 of 37 powering the adm1169 the adm1169 is powered from the highest voltage input on e ither the positive-only supply inputs (vpx) or the high voltage supply input (vh). this technique offers improved redundancy because the device is not dependent on any particular voltage rail to keep it operational. the same pins are used for supply fault detection (see the supply supervision section). a v dd arbitrator on the device chooses which supply to use. the arbitrator can be considered an oring of four low dropout regulators (ldos) together. a supply comparator chooses the highest input to provide the on-chip supply. there is minimal switching loss with this architecture (~0.2 v), resulting in the ability to power the adm1169 from a supply as low as 3.0 v. note that the supply on the vxx pins cannot be used to power the device. an external capacitor to gnd is required to decouple the on- chip supply from noise. this capacitor should be connected to the vddcap pin, as shown in figure 21. the capacitor has another use during brownouts (momentary loss of power). under these conditions, when the input supply (vpx or vh) dips transiently below v dd , the synchronous rectifier switch immediately turns off so that it does not pull v dd down. the v dd capacitor can then act as a reservoir to keep the device active until the next highest supply takes over the powering of the device. a 10 f capacitor is recommended for this reservoir/decoupling function. the vh input pin can accommodate supplies up to 14.4 v, which allows the adm1169 to be powered using a 12 v backplane supply. in cases where this 12 v supply is hot swapped, it is recommended that the adm1169 not be connected directly to the supply. suitable precautions, such as the use of a hot swap controller, or rc filter network, should be taken to protect the device from transients that could cause damage during hot swap events. when two or more supplies are within 100 mv of each other, the supply that first takes control of v dd keeps control. for example, if vp1 is connected to a 3.3 v supply, v dd powers up to approximately 3.1 v through vp1. if vp2 is then connected to another 3.3 v supply, vp1 still powers the device unless vp2 goes 100 mv higher than vp1. supply comparator in en out 4.75v ldo in en out 4.75v ldo in en out 4.75v ldo in en out 4.75v ldo vh vp3 vp2 vp1 vddcap internal device supply 04735-022 figure 21. v dd arbitrator operation
adm1169 preliminary technical data rev. pr. a | page 14 of 37 inputs supply supervision the adm1169 has eight programmable inputs. four of these a re dedicated supply fault detectors (sfds). these dedicated inputs are called vh and vpx (vp1 to vp3) by default. the other four inputs are labeled vxx (vx1 to vx4) and have dual functionality. they can be used either as sfds, with functionality similar to the vh and vpx, or as cmos-/ttl-compatible logic inputs to the device. therefore, the adm1169 can have up to eight analog inputs, a minimum of four analog inputs and four digital inputs, or a combination thereof. if an input is used as an analog input, it cannot be used as a digital input. therefore, a configuration requiring eight analog inputs has no available digital inputs. table 6 shows the details of each input. programming the supply fault detectors the adm1169 can have up to eight sfds on its eight input c hannels. these highly programmable reset generators enable the supervision of up to eight supply voltages. the supplies can be as low as 0.573 v and as high as 14.4 v. the inputs can be configured to detect an undervoltage fault (the input voltage drops below a preprogrammed value), an overvoltage fault (the input voltage rises above a preprogrammed value), or an out-of- window fault (the input voltage is outside a preprogrammed range). the thresholds can be programmed to an 8-bit resolution in registers provided in the adm1169. this translates to a voltage resolution that is dependent on the range selected. the resolution is given by step size = threshold range /255 therefore, if the high range is selected on vh, the step size can be calculated as follows: (14.4 v ? 6.0 v)/255 = 32.9 mv table 5 lists the upper and lower limits of each available range, the bottom of each range (v b ), and the range itself (v r ). table 5. voltage range limits voltage range (v) v b (v) v r (v) 0.573 to 1.375 0.573 0.802 1.25 to 3.00 1.25 1.75 2.5 to 6.0 2.5 3.5 6.0 to 14.4 6.0 8.4 the threshold value required is given by v t = ( v r n )/255 + v b where: v t is the desired threshold voltage (undervoltage or overvoltage). v r is the voltage range. n is the decimal value of the 8-bit code. v b is the bottom of the range. reversing the equation, the code for a desired threshold is given by n = 255 ( v t ? v b )/ v r for example, if the user wants to set a 5 v overvoltage threshold on vp1, the code to be programmed in the ps1ovth register (as discussed in the an-721 application note) is given by n = 255 (5 ? 2.5)/3.5 therefore, n = 182 (1011 0110 or 0xb6).
preliminary technical data adm1169 rev. pr. a | page 15 of 37 input comparator hysteresis the uv and ov comparators shown in figure 22 are always m onitoring vpx. to avoid chatter (multiple transitions when the input is very close to the set threshold level), these compara- tors have digitally programmable hysteresis. the hysteresis can be programmed up to the values shown in table 6. 04735-023 + ? + ? uv comparator vref fault type select ov comparator fault output glitch filter vpx mid low range select ultra low figure 22. supply fault detector block the hysteresis is added after a supply voltage goes out of t olerance. therefore, the user can program the amount above the undervoltage threshold to which the input must rise before an undervoltage fault is deasserted. similarly, the user can program the amount below the overvoltage threshold to which an input must fall before an overvoltage fault is deasserted. fsg?ducnu8s.-yut-s/y19s6jufvrd6v9?k6jusskuass,d6u input function v oltage range (v) maximum hysteresis voltage resolution (mv) glitch filter (s) vh high voltage analog input 2.5 to 6.0 425 mv 13.7 0 to 100 6.0 to 14.4 1.02 v 32.9 0 to 100 vpx positive analog input 0.573 to 1.375 97.5 mv 3.14 0 to 100 1.25 to 3.00 212 mv 6.8 0 to 100 2.5 to 6.0 425 mv 13.7 0 to 100 vxx high-z analog input 0.573 to 1.375 97.5 mv 3.14 0 to 100 digital input 0 to 5.0 not applicable not applicable 0 to 100 the hysteresis value is given by i oft1 = i q s 1oqgto /255 where: i oft1 is the desired hysteresis voltage. s 1oqgto is the decimal value of the 5-bit hysteresis code. note that n thresh has a maximum value of 31. the maximum hysteresis for the ranges is listed in table 6. input glitch filtering the final stage of the sfds is a glitch filter. this block provides t ime-domain filtering on the output of the sfd comparators, which allows the user to remove any spurious transitions such as supply bounce at turn-on. the glitch filter function is in addition to the digitally programmable hysteresis of the sfd comparators. the glitch filter timeout is programmable up to 100 s. for example, when the glitch filter timeout is 100 s, any pulse appearing on the input of the glitch filter block that is less than 100 s in duration is prevented from appearing on the output of the glitch filter block. any input pulse that is longer than 100 s appears on the output of the glitch filter block. the output is delayed with respect to the input by 100 s. the filtering process is shown in figure 23. 04735-024 t 0 t gf t 0 t gf t 0 t gf t 0 t gf input input pulse shorter than glitch filter timeout input pulse longer than glitch filter timeout output programmed timeout programmed timeout input output figure 23. input glitch filter function supply supervision with vxx inputs the vxx inputs have two functions. they can be used as either s upply fault detectors or digital logic inputs. when selected as analog (sfd) inputs, the vxx pins have functionality that is very similar to the vh and vpx pins. the primary difference is that the vxx pins have only one input range: 0.573 v to 1.375 v. therefore, these inputs can directly supervise only the very low supplies. however, the input impedance of the vxx pins is high, allowing
adm1169 preliminary technical data rev. pr. a | page 16 of 37 an external resistor divide network to be connected to the pin. t hus, potentially any supply can be divided down into the input range of the vxx pin and supervised. this enables the adm1169 to monitor other supplies, such as +24 v, +48 v, and ?5 v. an additional supply supervision function is available when the vxx pins are selected as digital inputs. in this case, the analog function is available as a second detector on each of the dedi- cated analog inputs, vpx and vh. the analog function of vx1 is mapped to vp1, vx2 is mapped to vp2, and so on. vx4 is mapped to vh. in this case, these sfds can be viewed as secondary or warning sfds. the secondary sfds are fixed to the same input range as the primary sfds. they are used to indicate warning levels rather than failure levels. this allows faults and warnings to be gener- ated on a single supply using only one pin. for example, if vp1 is set to output a fault when a 3.3 v supply drops to 3.0 v, vx1 can be set to output a warning at 3.1 v. warning outputs are available for readback from the status registers. they are also ored together and fed into the se, allowing warnings to generate interrupts on the pdos. therefore, in this example, if the supply drops to 3.1 v, a warning is generated, and remedial action can be taken before the supply drops out of tolerance. vxx pins as digital inputs as discussed in the supply supervision with vxx inputs s ection, the vxx input pins on the adm1169 have dual functionality. the second function is as a digital logic input to the device. therefore, the adm1169 can be configured for up to four digital inputs. these inputs are ttl-/cmos-compatible inputs. standard logic signals can be applied to the pins: reset from reset generators, pwrgd signals, fault flags, manual resets, and so on. these signals are available as inputs to the se and, therefore, can be used to control the status of the pdos. the inputs can be configured to detect either a change in level or an edge. when configured for level detection, the output of the digital block is a buffered version of the input. when configured for edge detection, a pulse of programmable width is output from the digital block once the logic transition is detected. the width is programmable from 0 s to 100 s. the digital blocks feature the same glitch filter function that is available on the sfds. this enables the user to ignore spurious transitions on the inputs. for example, the filter can be used to debounce a manual reset switch. when configured as digital inputs, each vxx pin has a weak (10 a) pull-down current source available for placing the input into a known condition, even if left floating. the current source, if selected, weakly pulls the input to gnd. 04735-027 detector vxx (digi tal input) glitch filter vref = 1.4v to sequencing engine + ? figure 24. vxx digital input function
preliminary technical data adm1169 rev. pr. a | page 17 of 37 outputs supply sequencing through c onfigurable output drivers supply sequencing is achieved with the adm1169 using the p rogrammable driver outputs (pdos) on the device as control signals for supplies. the output drivers can be used as logic enables or as fet drivers. the sequence in which the pdos are asserted (and, therefore, the supplies are turned on) is controlled by the sequencing engine (se). the se determines what action is taken with the pdos based on the condition of the adm1169 inputs. therefore, the pdos can be set up to assert when the sfds are in tolerance, the correct input signals are received on the vxx digital pins, and no warnings are received from any of the inputs of the devices. the pdos can be used for a variety of functions. the primary function is to provide enable signals for ldos or dc-to-dc converters that generate supplies locally on a board. the pdos can also be used to provide a pwrgd signal, when all the sfds are in tolerance, or a reset output if one of the sfds goes out of specification (this can be used as a status signal for a dsp, fpga, or other microcontroller). the pdos can be programmed to pull up to a number of different options. the outputs can be programmed as follows: ? open-drain (allowing the user to connect an external pull- up resistor). ? open-drain with weak pull-up to v dd . ? open-drain with strong pull-up to v dd . ? open-drain with weak pull-up to vpx. ? open-drain with strong pull-up to vpx. ? strong pull-down to gnd. ? internally charge-pumped high drive (12 v, pdo1 to pdo6 only) . the last option (available only on pdo1 to pdo6) allows the user to directly drive a voltage high enough to fully enhance an external n-fet, which is used to isolate, for example, a card- side voltage from a backplane supply (a pdo can sustain greater than 10.5 v into a 1 a load). the pull-down switches can also be used to drive status leds directly. the data driving each of the pdos can come from one of three sources. the source can be enabled in the pdoxcfg configuration register (see the an-721 application note for details). t h e data sources are as follows: ? output from the se. ? directly from the smbus. a pdo can be configured so that the smbus has direct control over it. this enables software control of the pdos. therefore, a microcontroller can be used to initiate a software power-up/power-down sequence. ? on-chip clock. a 100 khz clock is generated on the device. this clock can be made available on any of the pdos. it can be used, for example, to clock an external device such as an led. default output configuration all of the internal registers in an unprogrammed adm1169 device f rom the factory are set to 0. because of this, the pdox pins are pulled to gnd by a weak (20 k) on-chip pull-down resistor. as the input supply to the adm1169 ramps up on vpx or vh, all pdox pins behave as follows: ? input supply = 0 v to 1.2 v. the pdos are high impedance. ? input supply = 1.2 v to 2.7 v. the pdos are pulled to gnd by a weak (20 k) on-chip pull-down resistor. ? supply > 2.7 v. factory programmed devices continue to pull all pdos to gnd by a weak (20 k) on-chip pull-down resistor. programmed devices download current eeprom configuration data, and the programmed setup is latched. the pdo then goes to the state demanded by the configuration. this provides a known condition for the pdos during power-up. the internal pull-down can be overdriven with an external pull-up of suitable value tied from the pdox pin to the required pull-up voltage. the 20 k resistor must be accounted for in calculating a suitable value. for example, if pdox must be pulled up to 3.3 v, and 5 v is available as an external supply, the pull-up resistor value is given by 3.3 v = 5 v 20 k/( r up + 20 k) therefore, r up = (100 k ? 66 k)/3.3 v = 10 k
preliminary technical data adm1169 rev. pr. a | page 18 of 37 04735-028 pdo se data cfg4 cfg5 cfg6 smbus data clk data 10 20k 10 20k vp1 sel vp4 10 20k v dd vfet (pdo1 to pdo6 only) 20k figure 25. programmable driver output
preliminary technical data adm1169 rev. pr. a | page 19 of 37 sequencing engine overview the adm1169 sequencing engine (se) provides the user with p owerful and flexible control of sequencing. the se implements a state machine control of the pdo outputs, with state changes conditional on input events. se programs can enable complex control of boards such as power-up and power-down sequence control, fault event handling, and interrupt generation on warnings. a watchdog function that verifies the continued operation of a processor clock can be integrated into the se program. the se can also be controlled via the smbus, giving software or firmware control of the board sequencing. the se state machine comprises 63 state cells. each state has the following attributes: ? monitors signals indicating the status of the eight input pins, vp1 to vp3, vh, and vx1 to vx4. ? can be entered from any other state. ? three exit routes move the state machine onto a next state: sequence detection, fault monitoring, and timeout. ? delay timers for the sequence and timeout blocks can be programmed independently, and changed with each state change. the range of timeouts is from 0 ms to 400 ms. ? output condition of the eight pdo pins is defined and fixed within a state. ? transition from one state to the next is made in less than 20 s, which is the time needed to download a state definition from eeprom to the se. ? can trigger a write of the black box fault and status registers into the black box section of eeprom. 04735-029 sequence timeout monitor fault state
% the adm1169 offers up to 63 state definitions. the signals m onitored to indicate the status of the input pins are the outputs of the sfds. warnings the se also monitors warnings. these warnings can be generated w hen the adc readings violate their limit register value or when the secondary voltage monitors on vpx and vh are triggered. the warnings are ored together and are available as a single warning input to each of the three blocks that enable exiting a state. smbus jump (unconditional jump) the se can be forced to advance to the next state uncondition- a lly. this enables the user to force the se to advance. examples of the use of this feature include moving to a margining state or debugging a sequence. the smbus jump or go-to command can be seen as another input to sequence and timeout blocks to provide an exit from each state. fsg?dufnubsi.?dubdg-ds/dubysydursyr1d6u state sequence t imeout monitor idle1 if vx1 is low, go to state idle2. idle2 if vp1 is okay, go to state en3v3. en3v3 if vp2 is okay, go to state en2v5. if vp2 is not okay after 10 ms, go to state dis3v3. if vp1 is not okay, go to state idle1. dis3v3 if vx1 is high, go to state idle1. en2v5 if vp3 is okay, go to state pwrgd. if vp3 is not okay after 20 ms, go to state dis2v5. if vp1 or vp2 is not okay, go to state fsel2. dis2v5 if vx1 is high, go to state idle1. fsel1 if vp3 is not okay, go to state dis2v5. if vp1 or vp2 is not okay, go to state fsel2. fsel2 if vp2 is not okay, go to state dis3v3. if vp1 is not okay, go to state idle1. pwrgd if vx1 is high, go to state dis2v5. if vp1, vp2, or vp3 is not okay, go to state fsel1.
adm1169 preliminary technical data rev. pr. a | page 20 of 37 sequencing engine application example the application in this section demonstrates the operation of t he se. figure 28 shows how the simple building block of a single se state can be used to build a power-up sequence for a three-supply system. table 8 lists the pdo outputs for each state in the same se implementation. in this system, a good 5 v supply on the vp1 pin and the vx1 pin held low are the triggers required to start a power-up sequence. the sequence next turns on the 3.3 v supply, then the 2.5 v supply (assuming successful turn- on of the 3.3 v supply). when all three supplies have turned on correctly, the pwrgd state is entered, where the se remains until a fault occurs on one of the three supplies, or until it is instructed to go through a power-down sequence by vx1 going high. faults are dealt with throughout the power-up sequence on a case-by-case basis. the following three sections (the sequence detector section, the monitoring fault detector section, and the timeout detector section) describe the individual blocks and use the sample application shown in figure 28 to demonstrate the actions of the state machine. sequence detector the sequence detector block is used to detect when a step in a s equence has been completed. it looks for one of the se inputs to change state, and is most often used as the gate for successful progress through a power-up or power-down sequence. a timer block that is included in this detector can insert delays into a power-up or power-down sequence, if required. timer delays can be set from 10 s to 400 ms. figure 27 is a block diagram of the sequence detector. 04735-032 supply fault detection logic input change or fault detection warnings force flow (unconditional jump) vp1 vx4 invert sequence detector select timer
' > if a timer delay is specified, the input to the sequence detector m ust remain in the defined state for the duration of the timer delay. if the input changes state during the delay, the timer is reset. the sequence detector can also help to identify monitoring faults. in the sample application shown in figure 28, the fsel1 and fsel2 states first identify which of the vp1, vp2, or vp3 pins has faulted, and then they take appropriate action. 04735-030 idle1 idle2 en3v3 dis3v3 dis2v5 pwrgd fsel1 fsel2 sequence states monitor fault states timeout states vx1 = 0 vp1 = 1 vp1 = 0 (vp1 + vp2) = 0 (vp1 + vp2 + vp3) = 0 (vp1 + vp2) = 0 vp2 = 1 vp3 = 1 vp2 = 0 vx1 = 1 vp3 = 0 vp2 = 0 vp1 = 0 vx1 = 1 vx1 = 1 10ms 20ms en2v5
- *"** ? . !// " 0
-+ pdo outputs idle1 idle2 en3v3 en2v5 dis3v3 dis2v5 pwrgd fsel1 fsel2 pdo1 = 3v3on 0 0 1 1 0 1 1 1 1 pdo2 = 2v5on 0 0 0 1 1 0 1 1 1 pdo3 = fault 0 0 0 0 1 1 0 1 1
preliminary technical data adm1169 rev. pr. a | page 21 of 37 monitoring fault detector the monitoring fault detector block is used to detect a failure on an i nput. the logical function implementing this is a wide or gate that can detect when an input deviates from its expected condition. the clearest demonstration of the use of this block is in the pwrgd state, where the monitor block indicates that a failure on one or more of the vpx, vxx, or vh inputs has occurred. no programmable delay is available in this block because the triggering of a fault condition is likely to be caused by a supply falling out of tolerance. in this situation, the device needs to react as quickly as possible. some latency occurs when moving out of this state because it takes a finite amount of time (~20 s) for the state configuration to download from eeprom into the se. figure 29 is a block diagram of the monitoring fault detector. 04735-033 supply fault detection logic input change or fault detection vp1 vx4 monitoring fault detector mask sense 1-bit fault detector fault warnings mask 1-bit fault detector fault mask sense 1-bit fault detector fault figure 29. monitoring fault detect or block diagram timeout detector the timeout detector allows the user to trap a failure to ensure p roper progress through a power-up or power-down sequence. in the sample application shown in figure 28, the timeout next- state transition is from the en3v3 and en2v5 states. for the en3v3 state, the signal 3v3on is asserted on the pdo1 output pin upon entry to this state to turn on a 3.3 v supply. this supply rail is connected to the vp2 pin, and the sequence detector looks for the vp2 pin to go above its undervoltage threshold, which is set in the supply fault detector (sfd) attached to that pin. the power-up sequence progresses when this change is detected. if, however, the supply fails (perhaps due to a short circuit over- loading this supply), the timeout block traps the problem. in this example, if the 3.3 v supply fails within 10 ms, the se moves to the dis3v3 state and turns off this supply by bringing pdo1 low. it also indicates that a fault has occurred by taking pdo3 high. timeout delays of 100 s to 400 ms can be programmed. 013+.a1mbat.1.3tat5d,t.6mza the adm1169 has a fault latch for recording faults. two registers, f stat1 and fstat2, are set aside for this purpose. a single bit is assigned to each input of the device, and a fault on that input sets the relevant bit. the contents of the fault register can be read out over the smbus to determine which input(s) faulted. the fault register can be enabled/disabled in each state. to latch data from one state, ensure that the fault latch is disabled in the following state. this ensures that only real faults are captured and not, for example, undervoltage conditions that may be present during a power-up or power-down sequence. the adm1169 also has a number of status registers. these include more detailed information, such as whether an under- voltage or overvoltage fault is present on a particular input. the status registers also include information on adc limit faults. there are two sets of these registers with different behaviors. the first set of status registers is not latched in any way and, therefore, can change at any time in response to changes on the inputs. these registers provide information as the uv and ov state of the inputs, the digital state of the gpi vxx inputs, and also the adc warning limit status. the second set of registers update each time the sequence engine changes state and are latched until the next state change. the second set of registers provides the same information as the first set, but in a more compact form. the reason for this is because these registers are used by the black box feature when writing status information for the previous state into eeprom. see the an-721 application note at www.analog.com for full d e tails about the adm1169 registers.
adm1169 preliminary technical data rev. pr. a | page 22 of 37 n onvolatile black box fault recording a section of eeprom, from address 0xf900 to address 0xf9ff, is p rovided that by default can be used to store user-defined settings and information. part of this section of eeprom, address 0xf980 to address 0xf9ff, can instead be used to store up to 16 fault records. any sequencing engine state can be designated as a black box write state. each time the sequence engine enters that state, a fault record is written into eeprom. the fault record provides a snapshot of the entire adm1166 state at the point in time when the last state was exited, just prior to entering the designated black box write state. a fault record contains the following information: ? a flag bit set to 0 after the fault record has been written. ? the state number of the previous state prior to the fault record write state. ? did a sequence/timeout/monitor condition cause the previous state to exit? ? uvstatx and ovstatx input comparator status. ? vxx gpistat status. ? limstatx status. ? a checksum byte. each fault record contains eight bytes, with each byte taking typically about 250 s to write to eeprom, for a total write time of about 2 ms. once the black box begins to write a fault record into eeprom, the adm1166 ensures that is complete before attempting to write any additional fault records. this means that if consecutive sequencing engine states are designated as black box write states, then a time delay must be used in the first state to ensure that the fault record is written before moving to the next state. when the adm1166 powers on initially, it performs a search to find the first fault record that has not been written to. it does this by checking the flag bit in each fault record until it finds one where the flag bit is 1. the first fault record is stored at address 0xf980, and at multiples of eight bytes after that, with the last record stored at address 0xf9f8. the fault recorder is only able to write in the eeprom. it is not able to erase the eeprom prior to writing the fault record. therefore, to ensure correct operation, it is important that the fault record eeprom is erased prior to use. once all the eeprom locations for the fault records are used, no more fault records are written. this ensures that the first fault in any cascading fault is stored and not overwritten and lost. to avoid the fault recorder filling up and fault records being lost, an application can periodically poll the adm1166 to determine if there are fault records to be read. alternatively, one of the pdox outputs can be used to generate an interrupt for a processor in the fault record write state to signal the need to come and read one or more fault records. after reading fault records during normal operation, two things must be done before the fault recorder will be able to reuse the eeprom locations. first, the eeprom section must be erased. the fault recorder must then be reset so that it performs its search again for the first unused location of eeprom that is available to store a fault record. black box writes with no external supply in cases where all the input supplies fail, for example, if the card h as been removed from a powered backplane, the state machine can be programmed to trigger a write into the black box eeprom. the decoupling capacitors on the rail that power the adm1166 and other loads on the board form an energy reservoir. depending on the other loads on the board and their behavior as the supply rails drop, there may be sufficient energy in the decoupling capacitors to allow the adm1166 to write a complete fault record (8 bytes of data). typically, it takes 2 ms to write to the eight bytes of a fault record. if the adm1166 is powered using a 12 v supply on the vh pin, then a uv threshold at 6 v could be set and used as the state machine trigger to start writing a fault record to eeprom. the higher the threshold, the earlier the black box write begins, and the more energy available in the decoupling capacitors to ensure it completes successfully. provided the vh supply, or another supply connected to a vpx pin, remains above 3.0 v during the time to write, the entire fault record would always be written to eeprom. in many cases, there should be sufficient decoupling capacitors on a board to power the adm1166 as it writes into eeprom. in cases where the decoupling capacitors are not able to supply sufficient energy after the board is removed to ensure a complete fault record is written, the value of the capacitor on vddcap may be increased. in the worst case, assuming that no energy is supplied to the adm1166 by the external decoupling capacitors, but that vddcap has 4.75 v on it, then a 47 f is sufficient to guarantee a single complete black box record can be written to eeprom.
preliminary technical data adm1169 rev. pr. a | page 23 of 37 voltage readback the adm1169 has an on-board, 12-bit, accurate adc for voltage r eadback over the smbus. the adc has an 8-channel analog mux on the front end. the eight channels consist of the eight sfd inputs (vh, vpx, and vxx). any or all of these inputs can be selected to be read, in turn, by the adc. the circuit controlling this operation is called the round-robin circuit. this circuit can be selected to run through its loop of conversions once or conti- nuously. averaging is also provided for each channel. in this case, the round-robin circuit runs through its loop of conversions 16 times before returning a result for each channel. at the end of this cycle, the results are written to the output registers. the adc samples single-sided inputs with respect to the agnd pin. a 0 v input gives out code 0, and an input equal to the voltage on refin gives out full code (4095 decimal). the inputs to the adc come directly from the vxx pins and from the back of the input attenuators on the vpx and vh pins, as shown in figure 30 and figure 31. 04735-025 vxx 2.048v vref no attenuation 12-bit adc digitized voltage reading figure 30. adc reading on vxx pins 04735-026 2.048v vref a ttenu a tion network (depends on range selected) 12-bit adc digitized voltage reading vpx/vh figure 31. adc reading on vpx/vh pins the voltage at the input pin can be derived from the following e quation: v = 4095 codeadc a ttenuation factor v refin where v refin = 2.048 v when the internal reference is used (that is, the refin pin is connected to the refout pin). the adc input voltage ranges for the sfd input ranges are listed in table 9. fsg?duxnuqm7u8s.-yuo9?ys,duass,d6uu t0ba69dcqa 1qqh9crqnu9a 1bva69dcqauufqrgha tr9gha)una 0rlquma tr9gha)una 0.573 to 1.375 1 0 to 2.048 1.25 to 3.00 2.181 0 to 4.46 2.5 to 6.0 4.363 0 to 6.0 1 6.0 to 14.4 10.472 0 to 14.4 1 1 the upper limit is the absolute maximum allowed voltage on the vpx and v h pins. the typical way to supply the reference to the adc on the re fin pin is to connect the refout pin to the refin pin. refout provides a 2.048 v reference. as such, the supervising range covers less than half the normal adc range. it is possible, however, to provide the adc with a more accurate external reference for improved readback accuracy. supplies can also be connected to the input pins purely for adc readback, even though these pins may go above the expected supervisory range limits (but not above the absolute maximum ratings on these pins). for example, a 1.5 v supply connected to the vx1 pin can be correctly read out as an adc code of approxi- mately 3/4 full scale, but it always sits above any supervisory limits that can be set on that pin. the maximum setting for the refin pin is 2.048 v. t3dd+at3d5tu6t6,ma26.va.v5a1bva in addition to the readback capability, another level of supervision i s provided by the on-chip 12-bit adc. the adm1169 has limit registers with which the user can program a maximum or mini- mum allowable threshold. exceeding the threshold generates a warning that can either be read back from the status registers or input into the se to determine what sequencing action the adm1169 should take. only one register is provided for each input channel. therefore, either an undervoltage threshold or overvoltage threshold (but not both) can be set for a given channel. the round-robin circuit can be enabled via an smbus write, or it can be programmed to turn on in any state in the se program. for example, it can be set to start after a power-up sequence is complete, and all supplies are known to be within expected tolerance limits. note that a latency is built into this supervision, dictated by the conversion time of the adc. with all 12 channels selected, the total time for the round-robin operation (averaging off) is approx- imately 6 ms (500 s per channel selected). supervision using the adc, therefore, does not provide the same real-time response as the sfds.
adm1169 preliminary technical data rev. pr. a | page 24 of 37 supply margining overview it is often necessary for the system designer to adjust supplies, e ither to optimize their level or force them away from nominal values to characterize the system performance under these conditions. this is a function typically performed during an in-circuit test (ict), such as when a manufacturer wants to guarantee that a product under test functions correctly at nominal supplies minus 10%. open-loop supply margining the simplest method of margining a supply is to implement a n open-loop technique (see figure 32). a popular way to do this is to switch extra resistors into the feedback node of a power module, such as a dc-to-dc converter or low dropout regulator (ldo). the extra resistor alters the voltage at the feedback or trim node and forces the output voltage to margin up or down by a certain amount. the adm1169 can perform open-loop margining for up to four supplies. the four on-board voltage dacs (dac1 to dac4) can drive into the feedback pins of the power modules to be margined. the simplest circuit to implement this function is an attenuation resistor that connects the dacx pin to the feedback node of a dc-to-dc converter. when the dacx output voltage is set equal to the feedback voltage, no current flows into the attenuation resistor, and the dc-to-dc converter output voltage does not change. taking dacx above the feedback voltage forces current into the feedback node, and the output of the dc-to-dc converter is forced to fall to compensate for this. the dc-to-dc converter output can be forced high by setting the dacx output voltage lower than the feedback node voltage. the series resistor can be split in two, and the node between them can be decoupled with a capacitor to ground. this can help to decouple any noise picked up from the board. decoupling to a ground local to the dc-to-dc converter is recommended. the adm1169 can be commanded to margin a supply up or down over the smbus by updating the values on the relevant dac output. closed-loop supply margining a more accurate and comprehensive method of margining is to i mplement a closed-loop system (see figure 33). the voltage on the rail to be margined can be read back to accurately margin the rail to the target voltage. the adm1169 incorporates all the circuits required to do this, with the 12-bit successive approximation adc used to read back the level of the supervised voltages, and the six voltage output dacs, implemented as described in the open- loop supply margining section, used to adjust supply levels. these circuits can be used along with other intelligence, such as a microcontroller, to implement a closed-loop margining system that allows any dc-to-dc converter or ldo supply to be set to any voltage, accurate to within 0.5% of the target. to implement closed-loop margining, 1. disable the four dacx outputs. 2. set the dac output voltage equal to the voltage on the feedback node. 3. enable the dac. 4. read the voltage at the dc-to-dc converter output that is connected to one of the vpx, vh, or vxx pins. 5. if necessary, modify the dacx output code up or down to adjust the dc-to-dc converter output voltage. otherwise, stop because the target voltage has been reached. 6. set the dac output voltage to a value that alters the supply output by the required amount (for example, 5%). 7. repeat step 4 through step 6 until the measured supply reaches the target voltage. step 1 to step 3 ensures that when the dacx output buffer is turned on, it has little effect on the dc-to-dc converter output. the dac output buffer is designed to power up without glitching by first powering up the buffer to follow the pin voltage. it does not drive out onto the pin at this time. once the output buffer is properly enabled, the buffer input is switched over to the dac, and the output stage of the buffer is turned on. output glitching is negligible.
preliminary technical data adm1169 rev. pr. a | page 25 of 37 04735-067 output dc-to-dc converter feedback gnd attenuation resistor, r3 pcb trace noise decoupling capacitor adm1169 dacx v out dac microcontroller vin device controller (smbus) r1 r2 figure 32. open-loop margining system using the adm1169 04735-034 output dc-to-dc converter feedback gnd attenuation resistor pcb trace noise decoupling capacitor vh/vpx/vxx adm1169 dacx mux adc dac device controller (smbus) microcontroller vin figure 33. closed-loop margining system using the adm1169 writing to the dacs four dac ranges are offered. they can be placed with midcode ( code 0x7f) at 0.6 v, 0.8 v, 1.0 v, and 1.25 v. these voltages are placed to correspond to the most common feedback voltages. centering the dac outputs in this way provides the best use of the dac resolution. for most supplies, it is possible to place the dac midcode at the point where the dc-to-dc converter output is not modified, thereby giving half of the dac range to margin up and the other half to margin down. the dac output voltage is set by the code written to the dacx register. the voltage is linear with the unsigned binary number in this register. code 0x7f is placed at the midcode voltage, as described previously. the output voltage is given by /yva.dh dh = ( /yvi ? 0x7f)/255 0.6015 + i .tt where i .tt is one of the four offset voltages. there are 256 dac settings available. the midcode value is located at dac code 0x7f, as close as possible to the middle of the 256 code range. the full output swing of the dacs is +302 mv (+128 codes) and ?300 mv (?127 codes) around the selected midcode voltage. the voltage range for each midcode voltage is shown in table 10. fsg?dutenuass,d6u49rue1k/9kduo9?ys,d6u midcode v oltage (v) minimum voltage output (v) maximum voltage output (v) 0.6 0.300 0.902 0.8 0.500 1.102 1.0 0.700 1.302 1.25 0.950 1.552 choosing the size of the attenuation r esistor the size of the attenuation resistor, r3, determines how much t he dac voltage swing affects the output voltage of the dc-to-dc converter that is being margined (see figure 33). because the voltage at the feedback pin remains constant, the current flowing from the feedback node to gnd through r2 is a constant. in addition, the feedback node itself is high impedance. this means that the current flowing through r1 is the same as the current flowing through r3. therefore, a direct relationship exists between the extra voltage drop across r1 during margining and the voltage drop across r3. this relationship is given by the following equation:
adm1169 preliminary technical data rev. pr. a | page 26 of 37 ? v out = r3 r1 ( v fb ? v dacout ) where: ? v out is the change in v out . v fb is the voltage at the feedback node of the dc-to-dc converter. v dacout is the voltage output of the margining dac. this equation demonstrates that if the user wants the output voltage to change by 300 mv, then r1 = r3. if the user wants the output voltage to change by 600 mv, r1 = 2 r3, and so on. it is best to use the full dac output range to margin a supply. choosing the attenuation resistor in this way provides the most resolution from the dac, meaning that with one dac code change, the smallest effect on the dc-to-dc converter output voltage is induced. if the resistor is sized up to use a code such as 27 decimal to 227 decimal to move the dc-to-dc converter output by 5%, it takes 100 codes to move 5% (each code moves the output by 0.05%). this is beyond the readback accuracy of the adc, but it should not prevent the user from building a circuit to use the most resolution. dac limiting and other safety features limit registers (called dplimx and dnlimx) on the device o ffer the user some protection from firmware bugs that can cause catastrophic board problems by forcing supplies beyond their allowable output ranges. essentially, the dac code written into the dacx register is clipped such that the code used to set the dac voltage is given by dac code = dacx, dacx dnlimx and dacx dplimx = dnlimx, dacx < dnlimx = dplimx, dacx > dplimx in addition, the dac output buffer is three-stated if dnlimx > d plimx. by programming the limit registers this way, the user can make it very difficult for the dac output buffers to be turned on during normal system operation. the limit registers are among the registers downloaded from eeprom at startup.
preliminary technical data adm1169 rev. pr. a | page 27 of 37 applications diagram 04735-068 3.3v out vh pdo8 pdo7 system reset pdo6 pwrgd pdo2 dac1 pdo1 pdo5 pdo4 pdo3 en out dc-to-dc1 in 3.3v out 3v out 5v out 12v out en out dc-to-dc2 in 1.25v out en out dc-to-dc3 in 1.2v out 0.9v out 5v out 1 2 v i n 5v in 3v in vp1 3v out vp2 3.3v out vp3 1.25v out vx1 1.2v out vx2 0.9v out vx3 refout powron vx4 10f 10f 10f refin vccp vddcap gnd en trim out dc-to-dc4 in adm1169 *only one margining circuit shown for clarity. dac1 to dac4 allow margining for up to four voltage rails. figure 34. applications diagram
adm1169 preliminary technical data rev. pr. a | page 28 of 37 communicating with the adm1169 configuration download at power-up the configuration of the adm1169 (undervoltage/overvoltage t hresholds, glitch filter timeouts, and pdo configurations) is dictated by the contents of the ram. the ram comprises digital latches that are local to each of the functions on the device. the latches are double-buffered and have two identical latches, latch a and latch b. therefore, when an update to a function occurs, the contents of latch a are updated first, and then the contents of latch b are updated with identical data. the advantages of this architecture are explained in detail in the updating the configuration section. the two latches are volatile memory and lose their contents at power-down. therefore, the configuration in the ram must be restored at power-up by downloading the contents of the eeprom (nonvolatile memory) to the local latches. this download occurs in steps, as follows: 1. with no power applied to the device, the pdos are all high impedance. 2. when 1.2 v appears on any of the inputs connected to the vdd arbitrator (vh or vpx), the pdos are all weakly pulled to gnd with a 20 k resistor. 3. when the supply rises above the undervoltage lockout of the device (uvlo is 2.5 v), the eeprom starts to download to the ram. 4. the eeprom downloads its contents to all latch as. 5. when the contents of the eeprom are completely downloaded to the latch as, the device controller signals all latch as to download to all latch bs simultaneously, completing the configuration download. 6. at 0.5 ms after the configuration download completes, the first state definition is downloaded from the eeprom into the se. note that any attempt to communicate with the device prior to the completion of the download causes the adm1169 to issue a no acknowledge (nack). updating the configuration after power-up, with all the configuration settings loaded from t he eeprom into the ram registers, the user may need to alter the configuration of functions on the adm1169, such as changing the undervoltage or overvoltage limit of an sfd, changing the fault output of an sfd, or adjusting the rise time delay of one of the pdos. the adm1169 provides several options that allow the user to update the configuration over the smbus interface. the following three options are controlled in the updcfg register. option 1 update the configuration in real time. the user writes to the ram a cross the smbus, and the configuration is updated immediately. option 2 update the latch as without updating the latch bs. with this m ethod, the configuration of the adm1169 remains unchanged and continues to operate in the original setup until the instruction is given to update the latch bs. option 3 change the eeprom register contents without changing the ram c ontents, and then download the revised eeprom contents to the ram registers. with this method, the configuration of the adm1169 remains unchanged and continues to operate in the original setup until the instruction is given to update the ram. the instruction to download from the eeprom in option 3 is also a useful way to restore the original eeprom contents if revisions to the configuration are unsatisfactory. for example, if the user needs to alter an overvoltage threshold, the ram register can be updated, as described in the option 1 section. however, if the user is not satisfied with the change and wants to revert to the original programmed value, the device controller can issue a command to download the eeprom contents to the ram again, as described in the option 3 section, restoring the adm1169 to its original configuration. the topology of the adm1169 makes this type of operation possible. the local, volatile registers (ram) are all double- buffered latches. setting bit 0 of the updcfg register to 1 leaves the double-buffered latches open at all times. if bit 0 is set to 0 when a ram write occurs across the smbus, only the first side of the double-buffered latch is written to. the user must then write a 1 to bit 1 of the updcfg register. this generates a pulse to update all the second latches at once. eeprom writes occur in a similar way. the final bit in this register can enable or disable eeprom page erasure. if this bit is set high, the contents of an eeprom page can all be set to 1. if low, the contents of a page cannot be erased, even if the command code for page erasure is programmed across the smbus. the bit map for the updcfg register is shown in the an-721 application note at www.analog.com . a flow diagram f o r download at power-up and subsequent configuration updates is shown in figure 35.
preliminary technical data adm1169 rev. pr. a | page 29 of 37 04735-035 power-up (v cc > 2.5v) eeprom e e p r o m l d d a t a r a m l d u p d smbus device controller latch a latch b function (ov threshold on vp1) figure 35. configuration update flow diagram updating the sequencing engine sequencing engine (se) functions are not updated in the same w ay as regular configuration latches. the se has its own dedicated 512-byte eeprom for storing state definitions, providing 63 individual states, each with a 64-bit word (one state is reserved). at power-up, the first state is loaded from the se eeprom into the engine itself. when the conditions of this state are met, the next state is loaded from the eeprom into the engine, and so on. the loading of each new state takes approximately 10 s. to alter a state, the required changes must be made directly to the eeprom. ram for each state does not exist. the relevant alterations must be made to the 64-bit word, which is then uploaded directly to the eeprom. internal registers the adm1169 contains a large number of data registers. t he principal registers are the address pointer register and the configuration registers. bllshvvmy9pa6hsm/hrpv6hsm the address pointer register contains the address that selects one o f the other internal registers. when writing to the adm1169, the first byte of data is always a register address that is written to the address pointer register. d9atpr sn6p9am/hrpv6hsvm the configuration registers provide control and configuration f or various operating parameters of the adm1169. eeprom the adm1169 has two 512-byte cells of nonvolatile, electrically e rasable, programmable read-only memory (eeprom), from address 0xf800 to register address 0xfbff. the eeprom is used for permanent storage of data that is not lost when the adm1169 is powered down. one eeprom cell , 0xf800 to 0xf9ff, contains the configuration data , user information and, if enabled, any fault records of the device; the other section, 0xfa00 to 0xfbff, contains the state definitions for the se. although referred to as read-only memory, the eeprom can be written to, as well as read from, using the serial bus in exactly the same way as the other registers. the major differences between the eeprom and other registers are as follows: an eeprom location must be blank before it can be written to. if it contains data, the data must first be erased. writing to the eeprom is slower than writing to the ram. writing to the eeprom should be restricted because it has a limited write/cycle life of typically 10,000 write operations, due to the usual eeprom wear-out mechanisms. the first eeprom is split into 16 (0 to 15) pages of 32 bytes each. page 0 to page 3, from address 0xf800 to address 0xf89f, hold the configuration data for the applications on the adm1166 (such as the sfds and pdos). these eeprom addresses are the same as the ram register addresses, prefixed by f8. page 5 to page 7, from address 0xf8a0 to address 0xf8ff, are reserved. page 8 to page 11 are available for customer use to store any information that may be required by the customer in their application. customers can store information on page 12 to page 15, or these pages can store the fault records written by the sequencing engine if users have decided to enable writing of the fault records for different states. data can be downloaded from the eeprom to the ram in one of the following ways: at power-up, when page 0 to page 4 are downloaded. by setting bit 0 of the udownld register (0xd8), which performs a user download of page 0 to page 4. when the sequence engine is enabled, it is not possible to access the section of eeprom from address 0xfa00 to address 0xfbff. the sequence engine must be halted before it is possible to read or write to this range. attempting to read or write to this range if the sequence engine is not halted will generate a no acknowledged, or nack. read/write access to the configuration and user eeprom ranges from address 0xf800 to address 0xf89f and address 0xf900 to address 0xf9ff depends on whether the black box fault recorder is enabled. if the fault recorder is enabled and one or more states have been set as fault record trigger states, then it is not possible to access any eeprom location in this range without first halting the black box. attempts to read or write
adm1169 preliminary technical data rev. pr. a | page 30 of 37 this eeprom range while the fault recorder is operating are a cknowledged by the device but do not return any useful data or modify the eeprom in any way. if none of the states are set as fault record trigger states, then the black box is considered disabled, and read/write access is allowed without having to halt the black box fault recorder. ? serial bus interface the adm1169 is controlled via the serial system management b us (smbus) and is connected to this bus as a slave device, under the control of a master device. it takes approximately 1 ms after power-up for the adm1169 to download from its eeprom. therefore, access to the adm1169 is restricted until the download is complete. identifying the adm1169 on the smbus the adm1169 has a 7-bit serial bus slave address (see table 11). t he device is powered up with a default serial bus address. the five msbs of the address are set to 10011; the two lsbs are determined by the logical states of pin a1 and pin a0. this allows the connection of four adm1169s to one smbus. fsg?duttnubdr1s?up-6ub?smduqkkrd66u a1 pin a0 pin hex address 7-bit address low low 0x98 1001100x 1 low high 0x9a 1001101x 1 high low 0x9c 1001110x 1 high high 0x9e 1001111x 1 1 x = read/write bit. the address is shown only as the first 7 msbs. the device also has several identification registers (read-only) that can be read across the smbus. table 12 lists these registers with their values and functions. fsg?dutbnu8kdsy141/sy19suad,16ydruos?-d6usskut-s/y19s6u name address value function manid 0xf4 0x41 manufacturer id for analog devices revid 0xf5 0x02 silicon revision mark1 0xf6 0x00 software brand mark2 0xf7 0x00 software brand general smbus timing figure 36, figure 37, and figure 38 are timing diagrams for g eneral read and write operations using the smbus. the smbus specification defines specific conditions for different types of read and write operations, which are discussed in the write operations and read operations sections. the general smbus protocol operates in the following three steps. byd.utu the master initiates data transfer by establishing a start condition, d efined as a high-to-low transition on the serial data line sda, while the serial clock line scl remains high. this indicates that a data stream follows. all slave peripherals connected to the serial bus respond to the start condition and shift in the next eight bits, consisting of a 7-bit slave address (msb first) plus an r/ w bit. this bit determines the direction of the data transfer, that is, whether data is written to or read from the slave device (0 = write, 1 = read). the peripheral whose address corresponds to the transmitted address responds by pulling the data line low during the low period before the ninth clock pulse, known as the acknowledge bit, and by holding it low during the high period of this clock pulse.
preliminary technical data adm1169 rev. pr. a | page 31 of 37 all other devices on the bus remain idle while the selected device w aits for data to be read from or written to it. if the r/ w bit is a 0, the master writes to the slave device. if the r/ w bit is a 1, the master reads from the slave device. step 2 data is sent over the serial bus in sequences of nine clock pulses: e ight bits of data followed by an acknowledge bit from the slave device. data transitions on the data line must occur during the low period of the clock signal and remain stable during the high period because a low-to-high transition when the clock is high could be interpreted as a stop signal. if the operation is a write operation, the first data byte after the slave address is a command byte. this command byte tells the slave device what to expect next. it may be an instruction telling the slave device to expect a block write, or it may be a register address that tells the slave where subsequent data is to be written. because data can flow in only one direction, as defined by the r/ w bit, sending a command to a slave device during a read operation is not possible. before a read operation, it may be necessary to perform a write operation to tell the slave what sort of read operation to expect and/or the address from which data is to be read. step 3 when all data bytes have been read or written, stop conditions a re established. in write mode, the master pulls the data line high during the 10th clock pulse to assert a stop condition. in read mode, the master device releases the sda line during the low period before the ninth clock pulse, but the slave device does not pull it low. this is known as a no acknowledge. the master then takes the data line low during the low period before the 10th clock pulse and then high during the 10th clock pulse to assert a stop condition. 04735-036 1 9 9 1 1 9 9 1 start by master ack. by slave ack. by slave ack. by slave ack. by slave frame 2 command code frame 1 slave address frame n data byte frame 3 data byte scl sda r/w stop by master scl (continued) sda (continued) d7 a0a11 001 1 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 figure 36. general smbus write timing diagram 04735-037 1 9 9 1 1 9 9 1 start by master ack. by slave ack. by master ack. by master no ack. frame 2 data byte frame 1 slave address frame n data byte frame 3 data byte scl sda r/w stop by master scl (continued) sda (continued) d7 a0a11 001 1 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 figure 37. general smbus read timing diagram
adm1169 preliminary technical data rev. pr. a | page 32 of 37 04735-038 scl sda p s s p t su; sto t hd;s ta t su; sta t su; dat t hd; dat t hd; sta t hi g h t buf t lo w t r t f figure 38. serial bus timing diagram
preliminary technical data adm1169 rev. pr. a | page 33 of 37 smbus protocols for ram and eeprom the adm1169 contains volatile registers (ram) and nonvola- t ile registers (eeprom). user ram occupies address 0x00 to address 0xdf; and the eeprom occupies address 0xf800 to address 0xfbff. data can be written to and read from both the ram and the eeprom as single data bytes. data can be written only to unprogrammed eeprom locations. to write new data to a programmed location, the location contents must first be erased. eeprom erasure cannot be done at the byte level. the eeprom is arranged as 32 pages of 32 bytes each, and an entire page must be erased. page erasure is enabled by setting bit 2 in the updcfg register (address 0x90) to 1. if this bit is not set, page erasure cannot occur, even if the command byte (0xfe) is programmed across the smbus. write operations the smbus specification defines several protocols for different t ypes of read and write operations. the following abbreviations are used in figure 39 to figure 47: ? s = start ? p = stop ? r = read ? w = write ? a = acknowledge ? a = no acknowledge the adm1169 uses the following smbus write protocols. send byte in a send byte operation, the master device sends a single c ommand byte to a slave device, as follows: 1. the master device asserts a start condition on sda. 2. the master sends the 7-bit slave address followed by the write bit (low). 3. the addressed slave device asserts an acknowledge (ack) on sda. 4. the master sends a command code. 5. the slave asserts ack on sda. 6. the master asserts a stop condition on sda and the transaction ends. in the adm1169, the send byte protocol is used for the following two purposes: ? to write a register address to the ram for a subsequent single byte read from the same address, or for a block read or a block write starting at that address, as shown in figure 39. 04735-039 2 4 1 3 5 6 slave address ram address (0x00 to 0xdf) s w a a p / 9"4"$$;$>9 ? t o erase a page of eeprom memory. eeprom memory can be written to only if it is unprogrammed. before writing to one or more eeprom memory locations that are already programmed, the page(s) containing those locations must first be erased. eeprom memory is erased by writing a command byte. the master sends a command code telling the slave device to erase the page. the adm1169 command code for a page erasure is 0xfe (1111 1110). note that, for a page erasure to take place, the page address must be given in the previous write word transaction (see the write byte/word section). in addition, bit 2 in the updcfg register (address 0x90) must be set to 1. 04735-040 2 4 1 3 5 6 slave address command byte (0xfe) s w a a p 22914 2 $ as soon as the adm1169 receives the command byte, p age erasure begins. the master device can send a stop command as soon as it sends the command byte. page erasure takes approximately 20 ms. if the adm1169 is accessed before erasure is complete, it responds with a no acknowledge (nack).
adm1169 preliminary technical data rev. pr. a | page 34 of 37 write byte/word in a write byte/word operation, the master device sends a c ommand byte and one or two data bytes to the slave device, as follows: 1. the master device asserts a start condition on sda. 2. the master sends the 7-bit slave address followed by the write bit (low). 3. the addressed slave device asserts an ack on sda. 4. the master sends a command code. 5. the slave asserts an ack on sda. 6. the master sends a data byte. 7. the slave asserts an ack on sda. 8. the master sends a data byte (or asserts a stop condition). 9. the slave asserts an ack on sda. 10. the master asserts a stop condition on sda to end the transaction. in the adm1169, the write byte/word protocol is used for the following three purposes: ? to write a single byte of data to the ram. in this case, the command byte is ram address 0x00 to ram address 0xdf, and the only data byte is the actual data, as shown in figure 41. 04735-041 slave address ram address (0x00 to 0xdf) s w a dataa pa 2 4 1 3 5 876 +709"4 ? t o set up a 2-byte eeprom address for a subsequent read, write, block read, block write, or page erasure. in this case, the command byte is the high byte of eeprom address 0xf8 to eeprom address 0xfb. the only data byte is the low byte of the eeprom address, as shown in figure 42. 04735-042 slave address eeprom address high byte (0xf8 to 0xfb) s w a eeprom address low byte (0x00 to 0xff) a pa 2 4 1 3 5 87 6
22914"$$ because a page consists of 32 bytes, only the three msbs of t he address low byte are important for page erasure. the lower five bits of the eeprom address low byte specify the addresses within a page and are ignored during an erase operation. ? to write a single byte of data to the eeprom. in this case, the command byte is the high byte of eeprom address 0xf8 to eeprom address 0xfb. the first data byte is the low byte of the eeprom address, and the second data byte is the actual data, as shown in figure 43. 04735-043 slave address eeprom address high byte (0xf8 to 0xfb) s w a eeprom address low byte (0x00 to 0xff) a p a 2 4 1 3 5 10 7 a 9 data 8 6 +7022914 block write in a block write operation, the master device writes a block of d ata to a slave device. the start address for a block write must have been set previously. in the adm1169, a send byte opera- tion sets a ram address, and a write byte/word operation sets an eeprom address, as follows: 1. the master device asserts a start condition on sda. 2. the master sends the 7-bit slave address followed by the write bit (low). 3. the addressed slave device asserts an ack on sda. 4. the master sends a command code that tells the slave device to expect a block write. the adm1169 command code for a block write is 0xfc (1111 1100). 5. the slave asserts an ack on sda. 6. the master sends a data byte that tells the slave device how many data bytes are being sent. the smbus specification allows a maximum of 32 data bytes in a block write. 7. the slave asserts an ack on sda. 8. the master sends n data bytes. 9. the slave asserts an ack on sda after each data byte. 10. the master asserts a stop condition on sda to end the transaction. 04735-044 slave address s w a 2 command 0xfc (block write) 4 1 3 a 5 byte count 6 a 7 a 9 10 a p a data 1 8 data n data 2 70229149"4 unlike some eeprom devices that limit block writes to within a page boundary, there is no limitation on the start address when performing a block write to eeprom, except when ? there are fewer than n locations from the start address to the highest eeprom address (0xfbff), which results in writing to invalid addresses. ? an address crosses a page boundary. in this case, both pages must be erased before programming. note that the adm1169 features a clock extend function for writes to eeprom. programming an eeprom byte takes approximately 250 s, which limits the smbus clock for repeated or block write operations. the adm1169 pulls scl low and extends the clock pulse when it cannot accept any more data.
preliminary technical data adm1169 rev. pr. a | page 35 of 37 read operations the adm1169 uses the following smbus read protocols. receive byte in a receive byte operation, the master device receives a single b yte from a slave device, as follows: 1. the master device asserts a start condition on sda. 2. the master sends the 7-bit slave address followed by the read bit (high). 3. the addressed slave device asserts an ack on sda. 4. the master receives a data byte. 5. the master asserts a nack on sda. 6. the master asserts a stop condition on sda, and the transaction ends. in the adm1169, the receive byte protocol is used to read a single byte of data from a ram or eeprom location whose address has previously been set by a send byte or write byte/ word operation, as shown in figure 45. 04735-045 2 3 1 4 65 slave address s r data p a a +9 0229149"4 block read in a block read operation, the master device reads a block of d ata from a slave device. the start address for a block read must have been set previously. in the adm1169, this is done by a send byte operation to set a ram address, or a write byte/word operation to set an eeprom address. the block read operation itself consists of a send byte operation that sends a block read command to the slave, immediately followed by a repeated start and a read operation that reads out multiple data bytes, as follows: 1. the master device asserts a start condition on sda. 2. the master sends the 7-bit slave address followed by the write bit (low). 3. the addressed slave device asserts an ack on sda. 4. the master sends a command code that tells the slave device to expect a block read. the adm1169 command code for a block read is 0xfd (1111 1101). 5. the slave asserts an ack on sda. 6. the master asserts a repeat start condition on sda. 7. the master sends the 7-bit slave address followed by the read bit (high). 8. the slave asserts an ack on sda. 9. the adm1169 sends a byte-count data byte that tells the master how many data bytes to expect. the adm1169 always returns 32 data bytes (0x20), which is the maximum allowed by the smbus version 1.1 specification. 10. the master asserts an ack on sda. 11. the master receives 32 data bytes. 12. the master asserts an ack on sda after each data byte. 13. the master asserts a stop condition on sda to end the transaction. 04735-046 slave address s w a 2 command 0xfd (block read) 4 1 3 a 5 s 6 slave address 7 byte count 9 10 12 1 1 a r a 8 data 1 data 32 a 13 p a % 9 0229149"4 error correction the adm1169 provides the option of issuing a packet error c orrection (pec) byte after a write to the ram, a write to the eeprom, a block write to the ram/eeprom, or a block read from the ram/ eeprom. this option enables the user to verify that the data received by or sent from the adm1169 is correct. the pec byte is an optional byte sent after the last data byte has been written to or read from the adm1169. the protocol is the same as a block read for step 1 to step 12 and then proceeds as follows: 13. the adm1169 issues a pec byte to the master. the master checks the pec byte and issues another block read, if the pec byte is incorrect. 14. a nack is generated after the pec byte to signal the end of the read. 15. the master asserts a stop condition on sda to end the transaction. note that the pec byte is calculated using crc-8. the frame check sequence (fcs) conforms to crc-8 by the polynomial v ( i ) = i 8 + i 2 + i 1 + 1 see the smbus version 1.1 specification for details. an example of a block read with the optional pec byte is shown in figure 47. 04735-047 slave address s w a 2 command 0xfd (block read) 4 1 3 a 5 s 6 slave address 7 byte count 9 10 1211 a r a 8 data 1 data 32 a 13 pec 14 a 15 p a ' 9 0229149"4?02
adm1169 preliminary technical data rev. pr. a | page 36 of 37 outline dimensions compliant to jedec standards ms-026-bba view a top view (pins down) 8 1 32 25 24 17 16 9 0.80 bsc lead pitch 9.00 bsc sq 7.00 bsc sq 1.60 max 0.75 0.60 0.45 0.45 0.37 0.30 pin 1 0.20 0.09 1.45 1.40 1.35 0.10 max coplanarity v i e w a r o t a t e d 9 0 c c w seating plane 7 3.5 0 0.15 0.05 figure 48. 32-lead low profile quad flat package [lqfp] (st-32-2) dimensions shown in millimeters 02-02-2010-a 0.50 bsc bottom view top view pin 1 indicator exposed pad p i n 1 i n d i c a t o r seating plane 0.05 max 0.02 nom 0.20 ref coplanarity 0.08 0.30 0.25 0.18 6 . 1 0 6.00 sq 5.90 0.80 0.75 0.70 for proper connection of the exposed pad, refer to the pin configuration and function descriptions section of this data sheet. 0.45 0.40 0.35 0.20 min * 4.70 4.60 sq 4.50 compliant to jedec standards mo-220-wjjd-5 with exception to exposed pad dimension. 40 1 11 20 21 30 31 10 figure 49. 40-lead lead frame chip scale package [lfcsp_wq] 6 mm 6 mm body, very thin quad (cp-40-7) dimensions shown in millimeters ordering guide model t emperature range package description package option adm1169astz 1 ?40c to +85c 32-lead lqfp st-32-2 adm1169astz-reel 1 ?40c to +85c 32-lead lqfp st-32-2 adm1169astz-reel7 1 ?40c to +85c 32-lead lqfp st-32-2 adm1169acpz 1 ?40c to +85c 40-lead lfcsp_wq cp-40-7 adm1169acpz-reel 1 ?40c to +85c 40-lead lfcsp_wq cp-40-7 ADM1169ACPZ-REEL7 1 ?40c to +85c 40-lead lfcsp_wq cp-40-7 eval-adm1169lqebz 1 evaluation board (lqfp version) 1 z = rohs compliant part.
preliminary technical data adm1169 rev. pr. a | page 37 of 37 notes ? 2010 analog devices, inc. all rights reserved. trademarks and r egistered trademarks are the property of their respective owners. pr09475-0-10/10(pra)

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