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? 2002 microchip technology inc. ds21475b-page 1 TC818a features ? auto-ranging analog-to-digital converter with 3-1/2 digit display annunciator outputs permit customizing of lcd auto-range operation for ac and dc voltage and resistance measurements two user selected ac/dc current ranges: 20ma and 200ma 22 operating ranges: 9 dc/ac voltage 4ac/dccurrent 9 resistance and low power ohms display hold function 3-1/2 digit resolution in auto-range mode: 1/2000 extended resolution in manual range mode: 1/3000 internal ac-to-dc conversion op amp triplex lcd drive for decimal points, digits, bar graphs, and annunciators continuity detection and piezoelectric transducer driver low drift internal reference: 75ppm/c 9v battery operation: 10mw low battery detection and lcd annunciator device selection table general description the TC818a is an integrating analog-to-digital con- verter (adc) with a 3-1/2 digit numeric lcd driver, automatic ranging, and single 9v battery operation. the numeric display provides 0.05% resolution and a full set of annunciators that spell out the TC818a's many operating modes. automatic range selection is provided for both voltage (dc and ac) and ohms (high and low power) measure- ments. expensive and bulky mechanical range switches are not required. five full scale ranges are available, with automatic selection of external volt/ohm attenuators over a 1 to 10,000 range. two current ranges, 20ma and 200ma, can be manually selected. the auto-range feature can be bypassed, allowing input attenuator selection through a single line input. during manual mode operation, resolution is extended to 3000 counts full scale. extended resolution is also available during 2000k ? and 2000v full scale auto- range operation. the extended range operation is indi- cated by a flashing 1 msd and by the fully extended bar graph. the TC818a includes an ac-to-dc converter for ac voltage and current measurements. only external diodes/resistors/capacitors are required. other fea- tures include a memory mode, low battery detection, display hold input, and continuity buzzer driver. the 3-1/2 digit numeric display includes a full set of annunciators. decimal points are adjusted as auto- matic or manual range changes occur, and voltage, current, and ohms operating modes are displayed. additional annunciators are activated for manual, auto, memory, hold, ac, low power ohms, and low battery conditions. the TC818a is available in a surface mounted 64-pin flat package. combining a numeric display driver, sin- gle 9v battery operation, internal range switching, and compact surface mounting, the TC818a is ideal for advanced portable instruments. part number package operating temperature range TC818acbu 64-pin pqfp 0 cto+70 c auto-ranging analog-to-digital converter with 3-1/2 digit display
TC818a ds21475b-page 2 ? 2002 microchip technology inc. package type 47 52 51 50 49 64 63 62 58 57 56 55 54 53 60 59 24 25 26 27 28 29 30 18 19 20 21 22 23 32 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 45 44 43 42 41 40 39 38 37 36 35 34 33 48 TC818a r x cfi adi ado r ? buf rvibuf acvh dgnd range -mem i hold c refl rm refl deint com v cc ac/-/auto bcp3 annunc fe2 agd2 -mem/batt bcp2 fe1 agd1 bcp1 c i acvl i i c refh refhi ? r3 v i vr4 vr5 vr2 vr3 ? r5 ? r4 ? r2 ? r1 dc( ? )/ ac(lo ? ) v ss c az lcd backplanes lcd segment drives 16 ohm 20ma buz fe0 agd0 bcp0 xtal1 xtal2 v disp bp1 bp2 bp3 lo ? /a ? /v k/m/ hold nc 46 nc 61 nc 31 nc 64-pin pqfp
? 2002 microchip technology inc. ds21475b-page 3 TC818a typical application ? 50 TC818a 0.1f lcd bias r7/100k ? r6/100k ? z1 6.2v 31 39 1.6385m ? 0.1 f r8/220 ? (ptc) 38 37 36 35 ? r5 (10,000) ? r4 (1,000) ? r3 (100) ? r2 (10) ? r1 (1) rm refl r x 789 10 27 163.85k ? r2/1638.5 ? r1/163.85 ? r3/16.385k ? ohms range attenuator v disp bp3 annunc lo ? /a ? /v k/m/ hold ?mem/ batt fe2 fe1 bcp2 agd1 bcp1 fe0 agd0 bcp0 xtal1 deint 5 30 6 28 57 14 15 16 18 19 20 21 22 23 24 26 25 13 12 11 -mem lo ?+ ac mva 32.768khz (~ 33khz) 39pf 9v 58 xtal2 v ss 45 dgnd v 62 59 61 range -mem buz 4 enable audio transducer current input 20ma 200ma r15 d3 d4 r16 i i voltage input r14/9.9m ? 44 r13* 500k ? r12/1.111m ? r11/101k ? 41 r10/10k ? vr1 voltage range attenuator (1) vr2 (10) vr3 (100) vr4 (1,000) vr5 (10,000) ado r9/1k ? 40 43 34 53 d1 29 refhi com 33 c ref 32 cfi 51 r20 100k ? c6 0.01f 60 hold c i 47 r26/3k ? r27/2k ? ?+ c5/1f r24/10k ? r23/10k ? adi r21/2.2m ? 52 + r22/470k ? c4/1f 4.7f c2/0.22f acvh 56 c1/1f acvl 46 r ? buf rvibuf 49 rvibuf 55 r ? buf c az 0.1f 150 k 220 k sync backplane drivers 1000's segment and decimal point drive 1 ? 9 ? w 163.85mv positive temperature coefficient resistor auto hold r19/5k ? v cc *not required when resistor network is used. (see applications section for details.) d2 agd2 c az v cc 42 c int c refl c refh dc/ac or ? /lo ? k ? bp1 bp2 bcp3 ac/?/ auto 100's 10's 1's display annunciators com ?? r18/24k ? resistance input 54 hold 200ma 20ma 200ma ohm 3 2 63 200ma 20ma i ? v ?
TC818a ds21475b-page 4 ? 2002 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings* supply voltage .......................................................15v analog input voltage ..................................v cc to v ss reference input voltage..............................v cc to v ss voltage at pin 43 ................................. common 0.7v power dissipation ............................................800mw operating temperature range................ 0c to +70c storage temperature range ..............-65c to +150c *stresses above those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. TC818a electrical specifications electrical characteristics: v a =9v,t a = +25c, unless otherwise specified. symbol parameter min typ max unit test conditions zero input reading -0000 0000 +0000 digital reading 200mv range without 10m ? resistor -0001 ? +0001 digital reading 200mv range with 10m ? resistor -0000 0000 +0000 digital reading 20ma and 200ma range re rollover error ? ? 1 counts 200mv range without 10m ? resistor ? ? 3 200mv range with 10m ? resistor ? ? 1 20ma and 200ma range nl linearity error ? ? 1 count best case straight line i in input leakage current ? ? 10 pa e n input noise ? 20 ? v p-p bw = 0.1 to 10hz ac frequency error ? 1 ? % 40 to 500hz ? 5 ? % error 40 to 2000hz open circuit voltage for ohm measurements ? 570 660 mv excludes 200 ? range open circuit voltage for lo ohm measurements ? 285 350 mv excludes 200 ? range v com analog common voltage 2.8 3 3.3 v (v cc -v com ) v ctc common voltage temperature coefficient ? ? 50 ppm/c display multiplex rate ? 100 ? hz v il low logic input ? ? 1 a20ma ,ac ,i,low ? ,hold range, -mem, ohms (relativetodgnd,pin58) logic 1 pull-up current ? 25 ? v 20ma ,ac ,i,low ? ,hold range, -mem, ohms (relativetodgnd,pin58) v ol low logic output ? dgnd +0.1 ? v annunc, deint: i l =100 a v oh high logic output ? v cc - 0.1 ? v annunc, deint: i l =100 a buzzer drive frequency ? 4 ? khz low battery flag voltage 6.3 6.6 7 v v cc to v ssa operating supply current ? 0.8 1.5 ma
? 2002 microchip technology inc. ds21475b-page 5 TC818a 2.0 pin descriptions thedescriptionsofthepinsarelistedintable2-1. table 2-1: pin function table pin number (64-pin pqfp) symbol description 1 nc no connection. 2ohm logic input. ?0? (digital ground) for resistance measurement. 320ma logic input. ?0? (digital ground) for 20ma full scale current measurement. 4 buz buzzer. audio frequency, 4khz, output for continuity indication during resistance measurement. a noncontinuous 4khz signal is output to indicate an input over range during voltage or current measurements. 5 xtal1 32.768khz crystal connection. 6 xtal2 32.768khz crystal connection. 7v disp sets peak lcd drive signal: v p -v dd -v disp .v disp may also be used to compensate for temperature variation of lcd crystal threshold voltage. 8 bp1 lcd backplane #1. 9 bp2 lcd backplane #2. 10 bp3 lcd backplane #3. 11 lo ? /a lcd annunciator segment drive for low ohms resistance measurement and current measurement. 12 ? /v lcd annunciator segment drive for resistance measurement and voltage measurement. 13 k/m/hold lcd annunciator segment drive for k (?kilo-ohms?), m (?milliamps? and ?millivolts?) and hold mode. 14 bcp0 (one?s digit) lcd segment drive for ?b,? ?c? segments and decimal point of least significant digit (lsd). 15 agd0 lcd segment drive for ?a,? ?g,? ?d? segments of lsd. 16 fe0 lcd segment drive for ?f? and ?e? segments of lsd. 17 nc no connection. 18 bcp1 lcd segment drive for ?b,? ?c? segments and decimal point of 2nd lsd. 19 agd1 lcd segment drive for ?a,? ?g,? ?d? segments of 2nd lsd. 20 fe1 lcd segment drive for ?f? and ?e? segments of 2nd lsd. 21 bcp2 lcd segment drive for ?b,? ?c? segments and decimal point of 3rd lsd (hundred?s digit). 22 agd2 lcd segment drive for ?a,? ?g,? ?d? segments of 3rd lsd. 23 fe2 lcd segment drive for ?f,? ?e? segments of 3rd lsd. 24 bcp3 lcd segment drive for ?b,? ?c? segments and decimal point of msd, (thousand?s digit). 25 ac/-/auto lcd annunciator segment drive for ac measurements, polarity, and auto-range operation. 26 -mem/batt lcd annunciator segment drive for ac for low battery indication and memory (relative measurement). 27 annunc square wave output at the backplane frequency, synchronized to bp1. annunc can be used to control display annunciators. connecting an lcd segment to annunc turns it on; connecting it to its backplane turns it off. 28 v cc positive battery supply connection. 29 com analog circuit ground reference point. nominally 3v below v cc . 30 deint de-integrate output. 31 rm refl ratiometric (resistance measurement) reference low voltage. 32 c refl reference capacitor negative terminal c ref =0.1 f. 33 c refh reference capacitor positive terminal c ref =0.1 f. 34 refhi reference voltage for voltage and current measurement. nominally 163.85mv. 35 ? r1 standard resistor connection for 200 ? full scale. 36 ? r2 standard resistor connection for 2000 ? full scale.
TC818a ds21475b-page 6 ? 2002 microchip technology inc. 3.0 detailed description 3.1 analog-to-digital converter (adc) the TC818a includes an integrating adc with auto- ranging resolution of 2000 counts and manual range resolution of 3000 counts. figure 3-1 shows a simpli- fied schematic of the analog section. in auto-ranging mode, internal logic will adjust the input voltage or ohms attenuators so that measurements will always be made in the appropriate range. measurement ranges, logic control inputs, 3-1/2 digit lcd formatting, and other features are identical to the TC818a auto-ranging a/d converter. however, the TC818a is not pin compatible with, and is not a replace- ment for, the TC818a. a display annunciator output (annunc) can be used to customize the lcd. annunc is a square wave at the backplane frequency. connecting an annunciator segment to the annunc driver turns the segment on; connecting the segment to its backplane turns it off. 37 ? r3 standard resistor connection for 20k ? full scale range. 38 ? r4 standard resistor connection for 200k ? full scale range. 39 ? r5 standard resistor connection for 2000k ? full scale. 40 vr3 voltage measurement 100 attenuator. 41 vr2 voltage measurement 10 attenuator. 42 vr5 voltage measurement 10,000 attenuator. 43 vr4 voltage measurement 1000 attenuator. 44 v i unknown voltage input attenuator. 45 i i unknown current input. 46 acvl low output of ac-to-dc converter. 47 c i integrator capacitor connection. nominally 0.1 f. (must have low dielectric absorption. polypropylene dielectric suggested.) 48 nc no connection. 49 c az auto-zero capacitor connection. nominally 0.1 f. 50 r x unknown resistance input. 51 cfi input filter connection. 52 adi negative input of internal ac-to-dc operational amplifier. 53 ado output of internal ac-to-dc operational amplifier. 54 r ? buf active buffer output for resistance measurement. integration resistor connection. nominally 220k ? . 55 rvibuf active buffer output for voltage and current measurement. integration resistor connection. nominally 15k ? . 56 acvh positive output of ac-to-dc converter. 57 v ss negative supply connection. connect to negative terminal of 9v battery. 58 dgnd internal logic digital ground. ground connection for the logic "0" level. nominally 4.7v below v cc . 59 range input to set manual operation and change ranges. 60 hold input to hold display. connect to dgnd to "freeze" display. 61 -mem input to enter memory measurement mode for relative measurements. the two lsds are stored and subtracted from future measurements. 62 dc( ? )/ ac(lo ? ) input that selects ac or dc option during voltage/current measurements. for resistance measurements, the ohms or low power (voltage) ohms option can be selected. 63 i input to select measurement. connect to logic "0" (digital ground) for current measurement. 64 nc no connection. table 2-1: pin function table (continued) pin number (64-pin pqfp) symbol description
? 2002 microchip technology inc. ds21475b-page 7 TC818a figure 3-1: TC818a analog section TC818a + ? 2.8v ref amp 10k v cc 1.5 ? s43 v cc r18/24k v cc r19/5k analog cmmon 29 refhi 163.85mv 0.1f c refh 51 cfi 0.01f c6 r20/100k ? to digital section s38 az comparator integrator 49 47 int 0.01f 0.01f c int 55 rvi buf 150 k 54 r buf 220 k r ? buf r ? buf s34 de s20 de s18 de s19 de+ s16 de+ s17 de- buffer s35 s37 int+ ? + dc c1/1f 0.22f acvh s15 az 39 38 37 36 35 31 50 r x r7/100 k ? r6/100k ? r5/1.638m ? r1/163.85 ? r4/163.85k ? r3/16385 ? r2/1638.5 ? rm refl r5 ? r4 ? r3 ? r2 ? r1 0.1f ohms input current input r8/220 0.1f (ptc) d3 6.2v 200ma d4 r15/9 ? 20ma r16/1 i 45 i r12/1.11m r11/101k r10/10k r9/1k acvh 46 r24 10k r23 10k ? r26 3k ? r27/2k ? common d2 c3 1f c4 1f v 44 i vr2 41 vr3 40 vr4 43 vr5 42 ado adi voltage input r22 470 k ? r21 2.2 m r14/9.9 m ? r13/500k ? * 4.7f z1 s28 s27 s26 s25 s21 de s12 v 1/1 1/1k 1/100 1/10 1/1 +ac int( ? + dc) s11 s13 ac-to-dc converter op amp v1/1 v1/10 v1/100 v1/1k v1/10k 1/10 1/100 1/1k 1/10k s32 s33 s31 s30 s29 1/1 v cc s10 w + 1 s6 s7 s8 s9 s1 s2 s3 s4 s5 *not required when resistor network is used int ? ac ? v 1/10 v 1/100 v 1/1 k v 1/10k d1 de 33 c refh 32 c refl c az + + 53 s24 ? 1/10k c az s44 hi s14 s40 int ? ac ? lo ? 52 56 s22 s22 c2 s39 1.5 k ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? + ? + ? + ? + ? + ? 34
TC818a ds21475b-page 8 ? 2002 microchip technology inc. 3.2 resistance, voltage, current measurement selection the TC818a is designed to measure voltage, current, and resistance. auto-ranging is available for resistance and voltage measurements. the ohm (pin 2) and i (pin 63) input controls are normally pulled internally to v cc . by tying these pins to dgnd (pin 58), the TC818a is configured internally to measure resistance, voltage, or current. the required signal combinations are shown in table 3-1. table 3-1: TC818a measurement selection logic note 1: ohm and i are normally pulled internally high to v cc (pin 28). this is considered a logic ?1?. 2: logic ?0? is the potential at digital ground (pin 58). 3.3 resistance measurements (ohms and low power ohms) the TC818a can be configured to reliably measure in- circuit resistances shunted by semiconductor junc- tions. the TC818a low power ohms measurement mode limits the probe open circuit voltage. this pre- vents semiconductor junctions in the measured system from turning on. in the resistance measurement mode, the ? /lo ? (pin 62) input selects the low power ohms measure- ment mode. for low power ohms measurements, ? /lo ? (pin 62) is momentarily brought low to digital ground potential. the TC818a sets up for a low power ohms measurement, with a maximum open circuit probe voltage of 0.35v above analog common. in the low power ohms mode, an lcd display annunciator, lo ? , will be activated. on power-up, the low power ohms mode is not active. if the manual operating mode has been selected, tog- gling ? /lo ? resets the TC818a back to the auto- range mode. in manual mode, the decision to make a normal or low power ohms measurement should be made before selecting the desired range. the low power ohms measurement is not available on the 200 ? full scale range. open circuit voltage on this range is below 2.8v. the standard resistance values are listed in table 3-2. r8, a positive temperature coefficient resistor, and the 6.2v zener, z1, provide input voltage protection during ohms measurements. table 3-2: ohms range ladder network 3.4 ratiometric resistance measurements the TC818a measures resistance ratiometrically. accuracy is set by the external standard resistors con- nected to pin 35 through 39. a low power ohms mode may be selected on all but the 200 ? full scale range. the low power ohms mode limits the voltage applied to the measured system. this allows accurate ?in- circuit? measurements when a resistor is shunted by semiconductor junctions. full auto-ranging is provided. external precision stan- dard resistors are automatically switched to provide the proper range. figure 3-2 shows a detailed block diagram of the TC818a, configured for ratiometric resistance measure- ments. during the signal integrate phase, the reference capacitor charges to a voltage inversely proportional to the measured resistance, r x . figure 3-3 shows that the conversion accuracy relies on the accuracy of the external standard resistors. normally, the required accuracy of the standard resis- tances will be dictated by the accuracy specifications of the users end product. table 3-3 gives the equivalent ohms per count for various full scale ranges to allow users to judge the required resistor for accuracy. table 3-3: reference resistors function select pin 0 = digital ground 1 = floating or tied to v cc selected measurement ohm (pin 2) i (pin 63) 00voltage 0 1 resistance 1 0 current 11voltage full-scale range standard resistance low power ohms mode 200 ? 163.85 ? (r1) no 2000 ? 1638.5k ? (r2) yes 20k ? 16,385 ? (r3) yes 200k ? 163,85 ? (r4) yes 2,000k ? 1,638,500 ? (r5) yes full scale range reference resistor ? /count 200k 163.85 0.1 2k 1638.5 1 20k 16385 10 200k 163,850 100 2m 1,638,500 1000
? 2002 microchip technology inc. ds21475b-page 9 TC818a figure 3-2: ratiometric resistance measurement functional diagram figure 3-3: resistance measurement accuracy set by external standard resistor buffer TC818a r6/100k ? 32 s19 de s20 v cc -2.6v 1.5k ? v cc low ohms hi ohms va s29 s30 s31 s32 s33 1 10 100 1k 10k s28 s27 s26 s25 s24 de s23 voltage reference 39 38 37 36 35 1 10 100 1k 10k integrator comparator s37 s35 55 54 r ? buf s12 s13 de s18 s21 de int ( + dc) 33 c ref 0.1f r7/100k ? 31 analog common 29 34 28 10k 57 v ss 9v r18 24k ? ? refhi 220k 49 0.1f 150k ? rvibuf 47 c int 0.1f s36 s34 r x unknown r8 220 ? (ptc) v 1 1 r5/1638500 r4/163850 r3/16385 r2/1638.5 r1/163.85 ? ? de + ? lo c az v cc -2.8v v cc + ~ 1.5k ? ~ de 50 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? example: 200k ? full scale measurement v r 163.85k ? 163.85 220 r x ++ ------------------------------------------------- ?? ?? x0.64 = (a ) (b) v x r x 163.85k ? 220 ? r x ++ -------------------------------------------------------------- ?? ?? x0.64 = (c) ?ramp up voltage? = ?ramp down voltage? v x r i c i () ---------------- x t i v x r i c i () ---------------- t de = . .. where: r i = integrating resistor, t i = integrate time c i = integrating capacitor, t de = de-integrate time (d) r x = 163.85 t i (t de ) independent of r i ,c i or internal voltage reference 163.85k ? c ref 220 r x unknown to analog buffer 100k ? va = 0.64v for ohms 0.32v for lo ohms + ? r s v r v x
TC818a ds21475b-page 10 ? 2002 microchip technology inc. 3.5 voltage measurement resistive dividers are automatically changed to provide in range readings for 200mv to 2000v full scale read- ings (figure 3-1). the input resistance is set by exter- nal resistors r14/r13. the divider leg resistors are r9- r12. the divider leg resistors give a 200mv signal v i (pin 44) for full scale voltages from 200mv to 2000v. for applications which do not require a 10m ? input impedance, the divider network impedances may be lowered. this will reduce voltage offset errors induced by switch leakage currents. 3.6 current measurement the TC818a measures current only under manual range operation. the two user selectable, full scale ranges are: 20ma and 200ma. select the current mea- surement mode by holding the i input (pin 63) low at digital ground potential. the ohm input (pin 2) is left floating or tied to the positive supply. two ranges are possible. the 20ma full scale range is selected by connecting the 20ma input (pin 3) to digital ground. if left floating, the 200ma full scale range is selected. external current-to-voltage conversion resistors are used at the current input (i i input, pin 45). for 20ma measurements, a 10 ? resistor is used. the 200ma range requires a 1 ? resistor; full scale is 200mv. printed circuit board trace resistance between analog common and r16 must be minimized. in the 200ma range, for example, a 0.05 trace resistance will cause a 5% current-to-voltage conversion error at i i (pin 45). the extended resolution measurement option operates during current measurements. to minimize rollover error, the potential difference between analog common (com, pin 29) and system commonmustbeminimized. 3.7 ac-to-dc measurements in voltage and current measurements, the TC818a can be configured for ac measurements. an on-chip oper- ational amplifier and external rectifier components per- form the ac-to-dc conversion. when power is first applied, the TC818a enters the dc measurement mode. for ac measurements (current or voltage), ac/dc (pin 62) is momentarily brought low to digital ground potential; the TC818a sets up for ac measurements, and the ac liquid crystal display annunciator activates. toggling ac/dc low again returns the TC818a to dc operation. if the manual operating mode has been selected, tog- gling ac/dc resets the TC818a back to the auto- range mode. in manual mode operation, ac or dc should be selected first, then the desired range. the minimum ac full scale voltage range is 2v. the dc full scale minimum voltage is 200mv. ac current measurements are available on the 20ma and 200ma full scale current ranges. 3.8 conversion timing the TC818a analog-to-digital converter uses the con- ventional dual slope integrating conversion technique, with an added phase that automatically eliminates zero offset errors. the TC818a gives a zero reading with a 0 volt input. the TC818a is designed to operate with a low cost, readily available 32.768khz crystal. it serves as a time- base oscillator crystal in many digital clocks. (see external crystal sources.) the external clock is divided by two. the internal clock frequency is 16.348khz, giving a clock period of 61.04sec. the total conversion ? auto-zero phase, signal integrate and reference de-integrate ? requires 8000 clock periods or 488.3msec. there are approxi- mately two complete conversions per second. the integration time is fixed at 1638.5 clock periods or 100msec. this gives rejection of 50/60hz ac line noise. the maximum reference de-integrate time, represent- ing a full scale analog input, is 3000 clock periods (183.1msec) during manual extended resolution oper- ation. the 3000 counts are available in manual mode, extended resolution operation only. in auto-ranging mode, the maximum de-integrate time is 2000 clock periods. the 1000 clock periods are added to the auto- zero phase. an auto-ranging or manual conversion takes 8000 clock periods. after a zero crossing is detected in the reference de-integrate mode, the auto- zero phase is entered. figure 3-4 shows the basic TC818a timing relationships.
? 2002 microchip technology inc. ds21475b-page 11 TC818a figure 3-4: basic TC818a conversion timing 3.9 manual range selection the TC818a voltage and resistance auto-ranging fea- ture can be disabled by momentarily bringing range (pin 59) to digital ground potential (pin 58). when the change from auto-to-manual ranging occurs, the first manual range selected is the last range in the auto- ranging mode. the TC818a power-up circuit initially selects auto- range operation. once the manual range option is entered, range changes are made by momentarily grounding the range control input. the TC818a remains in the manual range mode until the measure- ment function (voltage or resistance), or measurement option (ac/dc, ? /lo ? ) changes. this causes the TC818a to return to auto-ranging operation. the ?auto? lcd annunciator driver is active only in the auto-range mode. figure 3-5 shows typical operation where the manual range selection option is used. also shown is the extended resolution display format. also, see figure 3-6 and figure 3-7. figure 3-5: manual range selection resistance measurements TC818a signal int phase ref deint phase auto-zero phase min. auto-zero time fixed 1638.5t p next conversion auto-zero cycle extended resolution zero crossing *in auto-range operation, maximum is 2000t p and minimum auto-zero time is 4361.5t p 3361.5t p *max. 3000t p t conv = 8000t p t de t i to input signal external crystal = 32.768khz internal clock period = t p = 2/32.768 = 61.04sec total conversion time = t conv = 8000(t p ) = 488.3msec 2 conv/sec integration time = t i = 1638.5(t p ) = 100msec maximum reference de-integrate time = t de 3000(t p ) = 183.1msec (manual extended resolution) = 2000(t p ) = 122.1msec (auto-range) maximum auto-zero time = (8000 - 3000 - 1638.5) (t p ) = 205.1msec (manual extended resolution) = (8000 - 3000 - 1638.5) (t p ) = 205.1msec (manual extended resolution) is r x < 19 ? is r x > 3000 ? no is r x > 2000 ? continuity indicator continuous 4khz buzzer no no yes extended resolution feature yes* display true reading *mode also operates when auto-ranging operator is selected and 2m ? < r x < 2.999m ? . yes display "1" 000 display last 3 digits and flash msd over range indicator "1" = > flashing msd manual range select output 4khz audio frequency
TC818a ds21475b-page 12 ? 2002 microchip technology inc. figure 3-6: manual range selection current measurements 3.10 extended resolution manual operation when operated in the manual range mode, the TC818a extends resolution by 50% for current, volt- age, and resistance measurements. resolution increases to 3000 counts from 2000 counts. the extended resolution feature operates only in the 2000k ? and 2000v ranges during auto-range operation. in the extended resolution operating mode, readings above 1999 are displayed with a blinking ?1? most sig- nificant digit. the blinking ?1? should be interpreted as the digit 2. the three least significant digits display data normally. the bar graph lcd will be fully extended. an input over range condition causes the most signifi- cant digit (msd) to blink and sets the three least signif- icant digits (lsds) to display ?000.? the buzzer output is enabled for input voltage and current signals with readings greater than 2000 counts in both manual and auto-range operations. for resistance measurements, the buzzer signal does not indicate an over range condition. the buzzer is used to indicate continuity. continuity is defined as a resistance reading less than 19 counts. figure 3-7: manual range selection voltage measurements range select is i x > 3000 ? is i x > 2000 ? display "1" 000 over range indicator "1" = > flashing msd no no yes display last 3 digits and flash msd display true reading yes output 4khz audio frequency noncontinuous yes is v x > 3000 ? no no yes yes extended resolution feature is v x > 2000 ? range select output 4khz audio frequency noncontinuous over range indicator display "1" 000 "1" = > flashing msd display last 3 digits and flash msd display true reading
? 2002 microchip technology inc. ds21475b-page 13 TC818a 3.11 -mem operating mode bringing -mem (pin 61) momentarily low configures the TC818a ?-mem? operating mode. the -mem lcd annunciator becomes active. in this operating mode, subsequent measurements are made relative to the last two digits ( 99) displayed at the time mem is low. this represents 5% of full scale. the last two significant digits are stored and subtracted from all the following input conversions. the following examples clarify operation: example 3-1: in auto-ranging example 3-2: in fixed range (200 full scale) example 3-3: in fixed range 20v full scale on power-up, the ?-mem? mode is not active. once the ?-mem? is entered, bringing mem low again returns the TC818a to normal operation. the ?-mem? mode is also cancelled whenever the mea- surement type (resistance, voltage, current ac /dc, ? /lo ? ) or range is changed. the lcd -mem annunci- ator will be off in normal operation. in the auto-range operation, if the following input signal cannot be converted on the same range as the stored value, the ?-mem? mode is cancelled. the lcd annun- ciator is turned off. the ?-mem? operating mode can be very useful in resistance measurements when lead length resistance would cause measurement errors. 3.12 automatic range selection operation when power is first applied, the TC818a enters the auto-range operating state. the auto-range mode may be entered from manual mode by changing the measurement function (resistance or voltage), or by changing the measurement option (ac /dc, ? /lo ? ). the automatic voltage range selection begins on the most sensitive scale first: 200mv for dc or 2v for ac measurements. the voltage range selection flow chart is shown in figure 3-8. internal input protection diodes to v cc (pin 28) and v ss (pin 57) clamp the input voltage. the external 10m ? input resistance (see r14 and r13 of functional dia- gram) limits current safely in an over range condition. the voltage range selection is designed to maximize resolution. for input signals less than 9% of full scale (count reading <180), the next most sensitive range is selected. an over range voltage input condition is flagged when- ever the internal count exceeds 2000, by activating the buzzer output (pin 4). this 4khz signal can directly drive a piezo electric acoustic transducer. an out of range input signal causes the 4khz signal to be on for 122msec, off for 122msec, on for 122msec and off for 610msec (see figure 3-14). during voltage auto-range operation, the extended res- olution feature operates on the 2000v range only (see extended resolution operating mode discussion). the resistance automatic range selection procedure is shown in figure 3-9. the 200 ? range is the first range selected, unless the low ohms resistance measure- ment option is selected. in low ohms operation, the first full scale range tried is 2k ? . the resistance range selected maximizes sensitivity. if the conversion results in a reading less than 180, the next most sensitive full scale range is tried. if the conversion is less than 19 in auto-range opera- tion, a continuous 4khz signal is output at buz (pin 4). an over range input does not activate the buzzer. out-of-range input conditions are displayed by a blink- ing msd with the three lsds set to ?000.? the extended resolution feature operates only on the 2000k ? and 2000v full scale range during auto-range operation. a blinking ?1? most significant digit is inter- preted as the digit 2. the three least significant digits display data normally. r i (n) = 18.21k ? (20k ? range) = display 18.21k ? mem = store 0.21k ? r i (n+1)= 19.87k ? (20k ? range) = display 19.87 - 0.21 = 19.66k ? r i (n+2)= 22.65k ? (200k ? range) = display 22.7k ? and mem disappears r i (n) = 18.21k ? = display 18.2k ? mem = store 8.2 ? r i (n+1) = 36.7 ? = display 36.7 - 8.2 = 28.5 ? r i (n+2) = 5.8 ? = display 5.8-8.2 = -2.4 ? * *will display minus resistance if following input is less than offset stored at fixed range. v i (n) = 0.51v = display 0.51v mem = store 0.51v v i (n+1) = 3.68v = display 3.68 - 0.51 = 3.17v v i (n+2) = 0.23v = display 0.23 -0.51 = -0.28v v i (n+3) = -5.21v = display - 5.21 - 0.51 = -5.72v
TC818a ds21475b-page 14 ? 2002 microchip technology inc. figure 3-8: auto-range operation: voltage measurement figure 3-9: auto-range operation: resistance measurement n = 0 if dc n = 1 if ac no yes kth conversion v x = (1/10 n ) v in n = n ? 1 n = 0; 200mv full scale range n = 1; 2v full scale range n = n k (remain in range selected during the kth conversion) n = n +1 k = k +1 v x < 180 ? display "1" 000 flash msd start : power-on, function or measurement option change yes n = 0 if dc n = 1 if ac ? display voltage (v) x yes no ? yes yes ? no n = 4 ? display "1" xxx flash msd over range activate buzzer extended resolution no v x > 2000 v x > 3000 n = 0 if ? n = 1 if lo ? no yes kth conversion r x = r in n = n ? 1 n = 0; 200 ? full scale range n = 1; 2k ? full scale range n = n +1 k = k +1 r x < 19 ? yes n = 0 if ? n = 1 if lo ? extended resolution no ? ? n = 4 ? no yes yes ? yes activate buzzer continuous 4khz signal continuity indicator no yes display resistance no ? r x < 180 r x > 2000 r x > 3000 (remain in range selected during the kth conversion) over range display "1" 000 flash msd display "1" xxx flash msd start : power-on, function or measurement option chan g e 1 10 n
? 2002 microchip technology inc. ds21475b-page 15 TC818a 3.13 low battery detection circuit the TC818a contains a low battery detector. when the 9v battery supply has been depleted to a 7v nominal value, the lcd low battery annunciator is activated. the low battery detector is shown in figure 3-10. the low battery annunciator remains off with the battery supply greater than 0.7v. the annunciator is on before the supply battery has reached 6.3v. figure 3-10: low battery detector 3.14 triplex liquid crystal display (lcd) drive the TC818a directly drives a triplexed liquid crystal display (lcd) using 1/3 bias drive. all numeric data, decimal point, polarity and function annunciator drive signals are developed by the TC818a. the lcds must be driven with an ac signal having zero dc component, for long display life. the liquid crystal polarization is a function of the rms voltage appearing across the backplane and segment driver. the peak drive signal applied to the lcd is: v cc -v disp for example, if v disp is set at a potential 3v below v cc , the peak drive signal is: v p =v cc -v disp =3v an ?off? lcd segment has an rms voltage of v p /3 across it, or 1 volt. an ?on? segment has a 0.63v p signal across it or 1.92v for v cc -v disp =3v. since the v disp pin is available, the user may adjust the ?on? and ?off? lcd levels for various manufactur- ers? displays, by changing v p signal across it, or 1.92v for v disp =3v. ?off? segments may become visible at high lcd oper- ating temperatures. a voltage with a -5 to -20mv/c temperature coefficient can be applied to v disp to accommodate the liquid crystal temperature operating characteristics, if necessary. the TC818a internally generates two intermediate lcd drive potentials (v h and v l ) from a resistive divider (figure 3-11) between v cc and v disp . the latter impedance is approximately 150k ? . this drive method is commonly known as 1/3 bias. with v disp connected to digital ground, v p 5.0v. the intermediate levels are needed so that drive sig- nals giving rms ?on? and ?off? levels can be gener- ated. figure 3-12 shows a typical drive signal and the resulting waveforms for ?on? and ?off? rms voltage levels across a selected lcd element. figure 3-11: 1/3 bias lcd drive 3.15 liquid crystal displays (lcds) most users will design their own custom lcd. how- ever, for prototyping purposes, a standard display is available from varitronix, ltd. this prototype display configuration is shown in figure 3-13 and table 3-4. varitronix ltd. 9/f liven house, 61-63, king yip street kwun tong, hong kong tel: (852)3-410286 fax: (852)34-39555 part no.: vim-328-dp usa office: vl electronics, inc. 3171 los feliz blvd, #303 los angeles, ca 90039 tel: (213) 738-8700 TC818a + ? to lcd annunciator selection logic low battery annunciator displayed for v s < 7v. v cc r 1 r 2 low battery detector v t r 3 v z 6.2v v ss comparator v t = 73 = 6.2v r 2 r 1 + r 2 v cc 50k 50k 50k to triplex segment drive logic see v dsip for proper v p with resistive divider v disp v h v l v p = v cc - v disp "off" = v p /3 rms "on" = v p rms TC818a 11 3 3
TC818a ds21475b-page 16 ? 2002 microchip technology inc. figure 3-12: triplex lcd drive waveforms a f b g e d c fe agd bcp bp1 bp2 bp3 backplanes 123456 v p (3v) bp1 bp2 bp3 v p v h v l 0 v p v h v l 0 waveforms to generate segments TC818a 1 23456 segments v p v h 0 -v l -v h -v p v p v h v l 0 -v l -v h -v p v p v h v l 0 -v l -v h -v p v p v h v l 0 -v l -v p v p v h v l 0 -v l -v p v p v h v l -v l -v p v p v h v l 0 -v l -v h -v p a (fe ? bp1) "on" b (bcp ? bp1) "on" c (bcp ? bp2) "on" d (agd ? bp3) "on" e (fe ? bp2) "off" f (fe ? bp1) "off" g (agd ? bp2) "on" applied rms voltage v rms = v rms = v rms = v p 11 3 3 v rms = v p 11 3 3 v rms = v p 11 3 3 v rms = v p 11 3 3 v rms = v p 11 3 3 v p 3 v p 3 backplanes
? 2002 microchip technology inc. ds21475b-page 17 TC818a 3.16 external crystal the TC818a is designed to operate with a 32,768hz crystal. this frequency is internally divided by two to give a 61.04sec clock period. one conversion takes 8000 clock periods or 488.3msec ( 2 conversions/ second). integration time is 1638.5 clock periods or 100msec. the 32khz quartz crystal is readily available and inexpensive. the 32khz crystal is commonly used in digital clocks and counters. several crystal sources exist. a partial listing is: statek corporation 512 n. main orange, ca 92668 (714) 639-7810 twx: 910-593-1355 telex: 67-8394 fox electronics 5570 enterprise parkway fort myers, fl 33905 (941) 693-0099 contact manufacturer for full specifications. figure 3-13: typical lcd configuration, TC818a triplex table 3-4: typical lcd configuration ? + w lo hold -mem ac ? k mva auto pad bp1 bp2 bp3 pad bp1 bp2 bp3 1 ? ? scale 19 ? ? bp3 2x0x1x220?bp2? 3 x5 x4 x3 21 bp1 ? ? 4x6x7x822?lowa 5 x11 x10x923 ? wv 6 x12 x13 x14 24 hold k m 7 x17 x16 x15 25 4b 4c ? 8 x18 x19 x20 26 4a 4g 4d 9 x23 x22 x21 27 4f 4e ? 10 x24 x25 x26 28 3b 3c 3p 11 x 29 x 28 x27 29 3a 3g 3d 12 x30 x31 x32 30 3f 3e ? 13 x35 x34 x33 31 2b 2c 2p 14 x36 x37 x38 32 2a 2g 2d 15 ? x40 x39 33 2a 2g 2d 16 bpi ? ? 34 1b 1g 1p 17 ? bp2 ? 35 z -mem ? 18 ? ? bp3 36 ac y auto
TC818a ds21475b-page 18 ? 2002 microchip technology inc. 3.17 ?buzzer? drive signal the buz output (pin 4) will drive a piezo electric audio transducer. the signal is activated to indicate an input over range condition for current and voltage measure- ments, or continuity during resistance measurements. during a resistance measurement, a reading less than 19 on any full scale range causes a continuous 4khz signal to be output. this is used as a continuity indication. a voltage or current input measurement over range is indicated by a noncontinuous 4khz signal at the buz output. the lcd most significant digit also flashes and the three least significant digits are set to display zero. the buzzer drive signal for over range is shown in figure 3-14. the buz output is active for any reading over 2000 counts in both manual and auto-range oper- ation. the buzzer is activated during an extended res- olution measurement. the buz signal swings from v cc (pin 28) to dgnd (pin 58). the signal is at v cc when not active. the buz output is also activated for 15ms whenever a range change is made in auto-range or manual opera- tion. changing the type of measurement (voltage, cur- rent, or resistance), or measurement option (ac/dc, ? /lo ? ), also activates the buzzer output for 15msec. a range change during a current measurement will not activate the buzzer output. figure 3-14: TC818a timing waveform for buzzer output power-up v in = 250mv 4000 1000 clock pulses 100ms 1638.5 cp 8000 12000 change range change range change range change input v in = 3.2v noncontinuous buzzer signal indicates input over range 3000cp 250cp 250cp 250cp 122ms 2000 cp az deint int integrate tsc818a signals buz (pin 4) auto-ranging 200mv range over range 2v range in range 2v range in range 200mv range extended range manual range 2v range in range 2v range out of range one cycle of over range buzzer 4khz 4khz 1 conversion digital ground v cc buzzer activated due to power-up 15ms due to manual range change due to range change 15ms buzzer activated due to previous conversion over range 122ms 122ms 122ms 122ms 122ms 610ms buzzer activated due to previous conversion over range 4khz 4khz 610ms 122ms 4khz signal 15ms 2500cp
? 2002 microchip technology inc. ds21475b-page 19 TC818a vendors for piezo electric audio transducers are: gulton industries piezo products division 212 durham avenue metuchen, new jersey 08840 (201) 548-2800 typical p/ns: 102-95ns, 101-fb-00 taiyo yuden (usa) inc. arlington center 714 west algonquin road arlington heights, illinois 60005 typical p/ns: cb27bb, cb20bb, cb355bb 3.18 display decimal point selection the TC818a provides a decimal point lcd drive sig- nal. the decimal point position is a function of the selected full scale range, as shown in table 3-5. 3.19 ac-to-dc converter operational amplifier the TC818a contains an on-chip operational amplifier that may be connected as a rectifier for ac-to-dc volt- age and current measurements. typical operational amplifier characteristics are: slew rate: 1v/ sec unity gain bandwidth: 0.4mhz open loop gain: 44db output voltage swing (load = 10k ? ) 1.5v (referenced to analog common) when the ac measurement option is selected, the input buffer receives an input signal through switch s14, rather than switch s11 (see figure 3-1). with external circuits, the ac operating mode can be used to perform other types of functions within the con- straints of the internal operational amplifier. external circuits that perform true rms conversion, or a peak hold function, are typical examples. 3.20 component selection 3.20.1 integration resistor selection the TC818a automatically selects one of two external integration resistors. rvibuf (pin 55) is selected for voltage and current measurement. r ? buf (pin 54) is selected for resistance measurements. 3.20.2 rvibuf selection (pin 55) in auto-range operation, the TC818a operates with a 200mv maximum full scale potential at v i (pin 44). resistive dividers at vr2 (pin 41), vr3 (pin 40), vr4 (pin 43), and vr5 (pin 42) are automatically switched to maintain the 200v full scale potential. in manual mode, the extended operating mode is acti- vated, giving a 300mv full scale potential at v i (pin 44). the integrator output swing should be maximized, but saturations must be avoided. the integrator will swing within 0.45v of v cc (pin 28) and 0.5v of v ss (pin 57) without saturating. a 2v swing is suggested. the value of rvibuf is easily calculated, assuming a worst case extended resolution input signal: where: v int = integrator swing = 2v t i = integration time = 100msec c i = integration capacitor = 0.1 f v max = maximum input at v i = 300mv equation 3-1: 3.20.3 r ? buf selection (pin 54) in ratiometric resistance measurements, the signal at r x (pin 50) is always positive, with respect to analog common. the integrator swings negative. the worst case integrator swing is for the 200 ? range with the manual, extended resolution option. the input voltage, v x (pin 50) is easily calculated (see figure 3-15). table 3-5: decimal point selection full scale range 1*9 *9 *9 dp3 dp2 dp1 2000v, 2000k ? off off off 200v, 200k ? off off on 20v, 20k ? off on off 2v, 2k ? on off off 200v, 200 ? off off on 200mv, 200 ? off off on 20ma off on off 200ma off off on rvibuf = v max (t i ) v int (c i ) = 150k ?
TC818a ds21475b-page 20 ? 2002 microchip technology inc. figure 3-15: r ? calculation (200 ? manual operation) where: v ancom = potential at analog common 2.7v r s = 220 ? r i = 163.85 ? r x = 300 ? r s = internal switch 33 resistance 600 ? equation 3-2: for a 3.1v integrator swing, the value of r ? buf is easily calculated: where: v int = integrator swing = 3.1v t i = integration time = 100msec c i = integration capacitor = 0.1f r x max =300 ? v x max = 700mv equation 3-3: with a low battery voltage of 6.6v, analog common will be approximately 3.6v above the negative supply termi- nal. with the integrator swinging down from analog com- mon toward the negative supply, a 3.1v swing will set the integrator output to 0.5v above the negative supply. 3.21 capacitors - c int ,c az and c ref the integration capacitor, c int , must have low dielec- tric absorption. a 0.1 f polypropylene capacitor is sug- gested. the auto-zero capacitor, c az , and reference capacitor, c ref , should be selected for low leakage and dielectric absorption. polystyrene capacitors are good choices. 3.22 reference voltage adjustment the TC818a contains a low temperature drift internal voltage reference. the analog common potential (pin 29) is established by this reference. maximum drift is a low 75ppm/c. analog common is designed to be approximately 2.6v below v cc (pin 28). a resistive divider (r18/r19, functional diagram) sets the TC818a reference input voltage (refhi, pin 34) to approximately 163.85mv. with an input voltage near full scale on the 200mv range, r19 is adjusted for the proper reading. 3.23 display hold feature the lcd will not be updated when hold (pin 60) is connected to gnd (pin 58). conversions are made, but the display is not updated. a hold mode lcd annun- ciator is activated when hold is low. the lcd hold annunciator is activated through the triplex lcd driver signal at pin 13. 3.24 flat package socket sockets suitable for prototype work are available. a usa source is: nepenthe distribution 2471 east bayshore, suite 520 palo alto, ca 94303 (415) 856-9332 twx: 910-373-2060 ?cbq? socket, part no. ic51-064-042 3.25 resistive ladder networks resistor attenuator networks for voltage and resistance measurements are available from: caddock electronics 1717 chicago avenue riverside, ca 92507 tel: (714) 788-1700 twx: 910-332-6108 table 3-6: resistive ladder networks 163.85 ? 220 ? 300 ? r s 600 ? sw33 r 1 r 2 r 3 v x analog common = v cc ? 3v v cc = 9v r ? buf = (v cc ?v ancom )r x (r x +r s +r 1 +r 8 ) =0.63v r ? buf = v x max (t i ) c i (v int ) = 200k ? attenuator accuracy attenuator type caddock part number 0.1% voltage 1776-c441 0.25% voltage 1776-c44 0.25% resistance t1794-204-1
? 2002 microchip technology inc. ds21475b-page 21 TC818a 4.0 packaging information 4.1 package marking information package marking data not available at this time. 4.2 taping form 4.3 package dimensions component taping orientation for 64-pin pqfp devices w user direction of feed pin 1 standard reel component orientation for tr suffix device p package carrier width (w) pitch (p) part per full reel reel size 64-pin pqfp 32 mm 24 mm 250 13 in carrier tape, number of components per reel and reel size note: drawing does not represent total number of pins. .018 (0.45) .012 (0.30) .031 (0.80) typ. .555 (14.10) .547 (13.90) .555 (14.10) .547 (13.90) .687 (17.45) .667 (16.95) .687 (17.45) .667 (16.95) .010 (0.25) typ. .130 (3.30) max. .120 (3.05) .100 (2.55) .041 (1.03) .031 (0.78) 7 max. .009 (0.23) .005 (0.13) pin 1 64-pin pqfp dimensions: mm (inches )
TC818a ds21475b-page 22 ? 2002 microchip technology inc. sales and support data sheets products supported by a preliminary data sheet may have an errata sheet describing minor operational differences and recom- mended workarounds. to determine if an errata sheet exists for a particular device, please contact one of the following: 1. your local microchip sales office 2. the microchip corporate literature center u.s. fax: (480) 792-7277 3. the microchip worldwide site (www.microchip.com) please specify which device, revision of silicon and data sheet (include literature #) you are using. new customer notification system register on our web site (www.microchip.com/cn) to receive the most current information on our products.
? 2002 microchip technology inc. ds21475b-page 23 TC818a information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warranty is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical com- ponents in life support systems is not authorized except with express written approval by microchip. no licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, filterlab, k ee l oq ,microid, mplab,pic,picmicro,picmaster, picstart, pro mate, seeval and the embedded control solutions company are registered trademarks of microchip tech- nology incorporated in the u.s.a. and other countries. dspic, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, microport, migratable memory, mpasm, mplib, mplink, mpsim, mxdev, picc, picdem, picdem.net, rfpic, select mode and total endurance are trademarks of microchip technology incorporated in the u.s.a. serialized quick turn programming (sqtp) is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2002, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. microchip received qs-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona in july 1999 and mountain view, california in march 2002. the company?s quality system processes and procedures are qs-9000 compliant for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, non-volatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001 certified.
ds21475b-page 24 ? 2002 microchip technology inc. americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: 480-792-7627 web address: http://www.microchip.com rocky mountain 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7966 fax: 480-792-7456 atlanta 500 sugar mill road, suite 200b atlanta, ga 30350 tel: 770-640-0034 fax: 770-640-0307 boston 2 lan drive, suite 120 westford, ma 01886 tel: 978-692-3848 fax: 978-692-3821 chicago 333 pierce road, suite 180 itasca, il 60143 tel: 630-285-0071 fax: 630-285-0075 dallas 4570 westgrove drive, suite 160 addison, tx 75001 tel: 972-818-7423 fax: 972-818-2924 detroit tri-atria office building 32255 northwestern highway, suite 190 farmington hills, mi 48334 tel: 248-538-2250 fax: 248-538-2260 kokomo 2767 s. albright road kokomo, indiana 46902 tel: 765-864-8360 fax: 765-864-8387 los angeles 18201 von karman, suite 1090 irvine, ca 92612 tel: 949-263-1888 fax: 949-263-1338 new york 150 motor parkway, suite 202 hauppauge, ny 11788 tel: 631-273-5305 fax: 631-273-5335 san jose microchip technology inc. 2107 north first street, suite 590 san jose, ca 95131 tel: 408-436-7950 fax: 408-436-7955 toronto 6285 northam drive, suite 108 mississauga, ontario l4v 1x5, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific australia microchip technology australia pty ltd suite 22, 41 rawson street epping 2121, nsw australia tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing microchip technology consulting (shanghai) co., ltd., beijing liaison office unit 915 bei hai wan tai bldg. no. 6 chaoyangmen beidajie beijing, 100027, no. china tel: 86-10-85282100 fax: 86-10-85282104 china - chengdu microchip technology consulting (shanghai) co., ltd., chengdu liaison office rm. 2401, 24th floor, ming xing financial tower no. 88 tidu street chengdu 610016, china tel: 86-28-6766200 fax: 86-28-6766599 china - fuzhou microchip technology consulting (shanghai) co., ltd., fuzhou liaison office unit 28f, world trade plaza no. 71 wusi road fuzhou 350001, china tel: 86-591-7503506 fax: 86-591-7503521 china - shanghai microchip technology consulting (shanghai) co., ltd. room 701, bldg. b far east international plaza no. 317 xian xia road shanghai, 200051 tel: 86-21-6275-5700 fax: 86-21-6275-5060 china - shenzhen microchip technology consulting (shanghai) co., ltd., shenzhen liaison office rm. 1315, 13/f, shenzhen kerry centre, renminnan lu shenzhen 518001, china tel: 86-755-2350361 fax: 86-755-2366086 hong kong microchip technology hongkong ltd. unit 901-6, tower 2, metroplaza 223 hing fong road kwai fong, n.t., hong kong tel: 852-2401-1200 fax: 852-2401-3431 india microchip technology inc. india liaison office divyasree chambers 1 floor, wing a (a3/a4) no. 11, o?shaugnessey road bangalore, 560 025, india tel: 91-80-2290061 fax: 91-80-2290062 japan microchip technology japan k.k. benex s-1 6f 3-18-20, shinyokohama kohoku-ku, yokohama-shi kanagawa, 222-0033, japan tel: 81-45-471- 6166 fax: 81-45-471-6122 korea microchip technology korea 168-1, youngbo bldg. 3 floor samsung-dong, kangnam-ku seoul, korea 135-882 tel: 82-2-554-7200 fax: 82-2-558-5934 singapore microchip technology singapore pte ltd. 200 middle road #07-02 prime centre singapore, 188980 tel: 65-6334-8870 fax: 65-6334-8850 ta iw a n microchip technology taiwan 11f-3, no. 207 tung hua north road taipei, 105, taiwan tel: 886-2-2717-7175 fax: 886-2-2545-0139 europe denmark microchip technology nordic aps regus business centre lautrup hoj 1-3 ballerup dk-2750 denmark tel: 45 4420 9895 fax: 45 4420 9910 france microchip technology sarl parc d?activite du moulin de massy 43 rue du saule trapu batiment a - ler etage 91300 massy, france tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany microchip technology gmbh gustav-heinemann ring 125 d-81739 munich, germany tel: 49-89-627-144 0 fax: 49-89-627-144-44 italy microchip technology srl centro direzionale colleoni palazzo taurus 1 v. le colleoni 1 20041 agrate brianza milan, italy tel: 39-039-65791-1 fax: 39-039-6899883 united kingdom arizona microchip technology ltd. 505 eskdale road winnersh triangle wokingham berkshire, england rg41 5tu tel: 44 118 921 5869 fax: 44-118 921-5820 03/01/02 *ds21475b* w orldwide s ales and s ervice

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