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1. general description the PCA9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the i 2 c-bus. the scl/sda upstream pair fans out to two scx/sdx downstream pairs, or channels. only one scx/sdx channel is selected at a time, determined by the contents of the programmable control register. a power-on reset function puts the registers in their default state and initializes the i 2 c-bus state machine with no channels selected. the pass gates of the multiplexer are constructed such that the v dd pin can be used to limit the maximum high voltage that will be passed by the PCA9540B. this allows the use of different bus voltages on each scx/sdx pair, so that 1.8 v, 2.5 v or 3.3 v parts can communicate with 5 v parts without any additional protection. external pull-up resistors can pull the bus up to the desired voltage level for this channel. all i/o pins are 5 v tolerant. 2. features n 1-of-2 bidirectional translating multiplexer n i 2 c-bus interface logic; compatible with smbus standards n channel selection via i 2 c-bus n power up with all multiplexer channels deselected n low r on switches n allows voltage level translation between 1.8 v, 2.5 v, 3.3 v and 5 v buses n no glitch on power-up n supports hot insertion n low standby current n operating power supply voltage range of 2.3 v to 5.5 v n 5 v tolerant inputs n 0 hz to 400 khz clock frequency n esd protection exceeds 2000 v hbm per jesd22-a114, 200 v mm per jesd2-a115 and 1000 v cdm per jesd22-c101 n latch-up testing is done to jedec standard jesd78 which exceeds 100 ma n packages offered: so8, tssop8, xson8u PCA9540B 2-channel i 2 c-bus multiplexer rev. 04 3 september 2009 product data sheet
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 2 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 3. ordering information 4. block diagram table 1. ordering information t amb = - 40 c to +85 c type number topside mark package name description version PCA9540Bd pa9540b so8 plastic small outline package; 8 leads; body width 3.9 mm sot96-1 PCA9540Bdp 9540b tssop8 plastic thin shrink small outline package; 8 leads; body width 3 mm sot505-1 PCA9540Bgd 40b xson8u plastic extremely thin small outline package; no leads; 8 terminals; utlp based; body 3 2 0.5 mm sot996-2 fig 1. block diagram of PCA9540B switch control logic PCA9540B power-on reset 002aae715 sc1 v ss v dd i 2 c-bus control input filter scl sda sc0 sd1 sd0
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 3 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 5. pinning information 5.1 pinning 5.2 pin description fig 2. pin con?guration for so8 fig 3. pin con?guration for tssop8 fig 4. pin con?guration for xson8u PCA9540Bd scl sc1 sda sd1 v dd v ss sd0 sc0 002aae713 1 2 3 4 6 5 8 7 PCA9540Bdp scl sc1 sda sd1 v dd v ss sd0 sc0 002aae714 1 2 3 4 6 5 8 7 002aae753 PCA9540Bgd transparent top view 8 7 6 5 1 2 3 4 scl sda v dd sd0 sc1 sd1 v ss sc0 table 2. pin description symbol pin description scl 1 serial clock line sda 2 serial data line v dd 3 supply voltage sd0 4 serial data 0 sc0 5 serial clock 0 v ss 6 supply ground sd1 7 serial data 1 sc1 8 serial clock 1
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 4 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 6. functional description refer to figure 1 bloc k diag r am of PCA9540B . 6.1 device addressing following a start condition the bus master must output the address of the slave it is accessing. the address of the PCA9540B is shown in figure 5 . the last bit of the slave address de?nes the operation to be performed. when set to logic 1 a read is selected, while a logic 0 selects a write operation. 6.2 control register following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9540B which will be stored in the control register. if multiple bytes are received by the PCA9540B, it will save the last byte received. this register can be written and read via the i 2 c-bus. 6.2.1 control register de?nition a scx/sdx downstream pair, or channel, is selected by the contents of the control register. this register is written after the PCA9540B has been addressed. the 2 lsbs of the control byte are used to determine which channel is to be selected. when a channel is selected, it will become active after a stop condition has been placed on the i 2 c-bus. this ensures that all scx/sdx lines will be in a high state when the channel is made active, so that no false conditions are generated at the time of connection. fig 5. slave address r/w 002aae716 1 1 1 0 0 0 0 slave address fixed fig 6. control register 002aae717 x x x x x b2 b1 b0 channel selection bits (read/write) 76543210 enable bit
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 5 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 6.3 power-on reset when power is applied to v dd , an internal power-on reset (por) holds the PCA9540B in a reset condition until v dd has reached v por . at this point, the reset condition is released and the PCA9540B registers and i 2 c-bus state machine are initialized to their default states (all zeroes), causing all the channels to be deselected. thereafter, v dd must be lowered below 0.2 v to reset the device. 6.4 voltage translation the pass gate transistors of the PCA9540B are constructed such that the v dd voltage can be used to limit the maximum voltage that will be passed from one i 2 c-bus to another. figure 7 shows the voltage characteristics of the pass gate transistors (note that the graph was generated using the data speci?ed in section 10 static char acter istics of this data sheet). in order for the PCA9540B to act as a voltage translator, the v o(sw) voltage should be equal to, or lower than the lowest bus voltage. for example, if the main bus was running at 5 v, and the downstream buses were 3.3 v and 2.7 v, then v o(sw) should be equal to or below 2.7 v to effectively clamp the downstream bus voltages. looking at table 3. control register: writechannel selection; readchannel status d7 d6 d5 d4 d3 b2 b1 b0 command xxxxx0 xxno channel selected xxxxx 1 0 0 channel 0 enabled xxxxx 1 0 1 channel 1 enabled xxxxx1 1 xno channel selected 00000000no channel selected; power-up default state (1) maximum (2) typical (3) minimum fig 7. pass gate voltage versus supply voltage v dd (v) 2.0 5.5 4.5 3.0 4.0 002aaa964 3.0 2.0 4.0 5.0 v o(sw) (v) 1.0 3.5 5.0 2.5 (1) (2) (3)
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 6 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer figure 7 , we see that v o(sw)(max) will be at 2.7 v when the PCA9540B supply voltage is 3.5 v or lower so the PCA9540B supply voltage could be set to 3.3 v. pull-up resistors can then be used to bring the bus voltages to their appropriate levels (see figure 14 ). more information can be found in application note an262, pca954x family of i 2 c/smbus multiplexers and switches . 7. characteristics of the i 2 c-bus the i 2 c-bus is for 2-way, 2-line communication between different ics or modules. the two lines are a serial data line (sda) and a serial clock line (scl). both lines must be connected to a positive supply via a pull-up resistor when connected to the output stages of a device. data transfer may be initiated only when the bus is not busy. 7.1 bit transfer one data bit is transferred during each clock pulse. the data on the sda line must remain stable during the high period of the clock pulse as changes in the data line at this time will be interpreted as control signals (see figure 8 ). 7.2 start and stop conditions both data and clock lines remain high when the bus is not busy. a high-to-low transition of the data line while the clock is high is de?ned as the start condition (s). a low-to-high transition of the data line while the clock is high is de?ned as the stop condition (p) (see figure 9 ). fig 8. bit transfer mba607 data line stable; data valid change of data allowed sda scl fig 9. de?nition of start and stop conditions mba608 sda scl p stop condition s start condition
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 7 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 7.3 system con?guration a device generating a message is a transmitter, a device receiving is the receiver. the device that controls the message is the master and the devices which are controlled by the master are the slaves (see figure 10 ). 7.4 acknowledge the number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. each byte of eight bits is followed by one acknowledge bit. the acknowledge bit is a high level put on the bus by the transmitter, whereas the master generates an extra acknowledge related clock pulse. a slave receiver which is addressed must generate an acknowledge after the reception of each byte. also, a master must generate an acknowledge after the reception of each byte that has been clocked out of the slave transmitter. the device that acknowledges has to pull down the sda line during the acknowledge clock pulse so that the sda line is stable low during the high period of the acknowledge related clock pulse; set-up and hold times must be taken into account. a master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. in this event, the transmitter must leave the data line high to enable the master to generate a stop condition. fig 10. system con?guration 002aaa966 master transmitter/ receiver slave receiver slave transmitter/ receiver master transmitter master transmitter/ receiver sda scl i 2 c-bus multiplexer slave fig 11. acknowledgement on the i 2 c-bus 002aaa987 s start condition 9 8 2 1 clock pulse for acknowledgement not acknowledge acknowledge data output by transmitter data output by receiver scl from master
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 8 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 7.5 bus transactions 8. application design-in information fig 12. write control register fig 13. read control register 002aae719 1 1 0 0 0 0 0 a s 1 a p slave address start condition r/w acknowledge from slave acknowledge from slave control register sda stop condition xxxxxb2b1b0 002aae720 xxxxxb2b1b0 1 1 0 0 0 0 1 a s 1 na p slave address start condition r/w acknowledge from slave no acknowledge from master control register sda stop condition last byte fig 14. typical application PCA9540B sd0 sc0 v ss sda scl v dd = 3.3 v v dd = 2.7 v to 5.5 v i 2 c-bus/smbus master 002aae721 sda scl channel 0 v = 2.7 v to 5.5 v sd1 sc1 channel 1 v = 2.7 v to 5.5 v
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 9 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 9. limiting values [1] the performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction temperatures which are detrimental to reliability. the maximum junction temperature of this integrated circuit should not exceed 125 c. table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). voltages are referenced to ground (v ss = 0 v). [1] symbol parameter conditions min max unit v dd supply voltage - 0.5 +7.0 v v i input voltage - 0.5 +7.0 v i i input current - 20 ma i o output current - 25 ma i dd supply current - 100 ma i ss ground supply current - 100 ma p tot total power dissipation - 400 mw t stg storage temperature - 60 +150 c t amb ambient temperature operating - 40 +85 c
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 10 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 10. static characteristics [1] v dd must be lowered to 0.2 v in order to reset part. table 5. static characteristics at v dd = 2.3 v to 3.6 v v ss =0v; t amb = - 40 c to +85 c; unless otherwise speci?ed. see t ab le 6 for v dd = 3.6 v to 5.5 v. symbol parameter conditions min typ max unit supply v dd supply voltage 2.3 - 3.6 v i dd supply current operating mode; v dd = 3.6 v; no load; v i =v dd or v ss ; f scl = 100 khz -2050 m a i stb standby current standby mode; v dd = 3.6 v; no load; v i =v dd or v ss ; f scl = 0 khz - 0.1 1 m a v por power-on reset voltage no load; v i =v dd or v ss [1] - 1.6 2.1 v input scl; input/output sda v il low-level input voltage - 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -6 v i ol low-level output current v ol = 0.4 v 3 - - ma v ol = 0.6 v 6 - - ma i l leakage current v i =v dd or v ss - 1- +1 m a c i input capacitance v i =v ss -78 pf pass gate r on on-state resistance v dd = 3.0 v to 3.6 v; v o = 0.4 v; i o =15ma 51131 w v dd = 2.3 v to 2.7 v; v o = 0.4 v; i o =10ma 71655 w v o(sw) switch output voltage v i(sw) =v dd = 3.3 v; i o(sw) = - 100 m a - 1.9 - v v i(sw) =v dd = 3.0 v to 3.6 v; i o(sw) = - 100 m a 1.6 - 2.8 v v i(sw) =v dd = 2.5 v; i o(sw) = - 100 m a - 1.5 - v v i(sw) =v dd = 2.3 v to 2.7 v; i o(sw) = - 100 m a 1.1 - 2.0 v i l leakage current v i =v dd or v ss - 1- +1 m a c io input/output capacitance v i =v ss - 2.5 5 pf
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 11 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer [1] v dd must be lowered to 0.2 v in order to reset part. table 6. static characteristics at v dd = 3.6 v to 5.5 v v ss =0v; t amb = - 40 c to +85 c; unless otherwise speci?ed. see t ab le 5 for v dd = 2.3 v to 3.6 v. symbol parameter conditions min typ max unit supply v dd supply voltage 3.6 - 5.5 v i dd supply current operating mode; v dd = 5.5 v; no load; v i =v dd or v ss ; f scl = 100 khz - 65 100 m a i stb standby current standby mode; v dd = 5.5 v; no load; v i =v dd or v ss - 0.3 1 m a v por power-on reset voltage no load; v i =v dd or v ss [1] - 1.6 2.1 v input scl; input/output sda v il low-level input voltage - 0.5 - +0.3v dd v v ih high-level input voltage 0.7v dd -6 v i ol low-level output current v ol = 0.4 v 3 - - ma v ol = 0.6 v 6 - - ma i il low-level input current v i =v ss - 1- +1 m a i ih high-level input current v i =v dd - 1- +1 m a c i input capacitance v i =v ss -68 pf pass gate r on on-state resistance v dd = 4.5 v to 5.5 v; v o = 0.4 v; i o =15ma 4924 w v o(sw) switch output voltage v i(sw) =v dd = 5.0 v; i o(sw) = - 100 m a - 3.6 - v v i(sw) =v dd = 4.5 v to 5.5 v; i o(sw) = - 100 m a 2.6 - 4.5 v i l leakage current v i =v dd or v ss - 1- +1 m a c io input/output capacitance v i =v ss - 2.5 5 pf
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 12 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 11. dynamic characteristics [1] pass gate propagation delay is calculated from the 20 w typical r on and the 15 pf load capacitance. [2] after this period, the ?rst clock pulse is generated. [3] a device must internally provide a hold time of at least 300 ns for the sda signal (referred to the v ih(min) of the scl signal) in order to bridge the unde?ned region of the falling edge of scl. [4] c b = total capacitance of one bus line in pf. [5] measurements taken with 1 k w pull-up resistor and 50 pf load. table 7. dynamic characteristics symbol parameter conditions standard-mode i 2 c-bus fast-mode i 2 c-bus unit min max min max t pd propagation delay from sda to sdx, or scl to scx - 0.3 [1] - 0.3 [1] ns f scl scl clock frequency 0 100 0 400 khz t buf bus free time between a stop and start condition 4.7 - 1.3 - m s t hd;sta hold time (repeated) start condition [2] 4.0 - 0.6 - m s t low low period of the scl clock 4.7 - 1.3 - m s t high high period of the scl clock 4.0 - 0.6 - m s t su;sta set-up time for a repeated start condition 4.7 - 0.6 - m s t su;sto set-up time for stop condition 4.0 - 0.6 - m s t hd;dat data hold time 0 [3] 3.45 0 [3] 0.9 m s t su;dat data set-up time 250 - 100 - ns t r rise time of both sda and scl signals - 1000 20 + 0.1c b [4] 300 ns t f fall time of both sda and scl signals - 300 20 + 0.1c b [4] 300 ns c b capacitive load for each bus line - 400 - 400 pf t sp pulse width of spikes that must be suppressed by the input ?lter - 50 - 50 ns t vd;dat data valid time high-to-low [5] -1 - 1 m s low-to-high [5] - 0.6 - 0.6 m s t vd;ack data valid acknowledge time - 1 - 1 m s
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 13 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer fig 15. de?nition of timing on the i 2 c-bus t sp t buf t hd;sta p p s t low t r t hd;dat t f t high t su;dat t su;sta sr t hd;sta t su;sto sda scl 002aaa986
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 14 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 12. package outline fig 16. package outline sot96-1 (so8) unit a max. a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec jeita mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 5.0 4.8 4.0 3.8 1.27 6.2 5.8 1.05 0.7 0.6 0.7 0.3 8 0 o o 0.25 0.1 0.25 dimensions (inch dimensions are derived from the original mm dimensions) notes 1. plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 2. plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. 1.0 0.4 sot96-1 x w m q a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a 4 5 pin 1 index 1 8 y 076e03 ms-012 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.20 0.19 0.16 0.15 0.05 0.244 0.228 0.028 0.024 0.028 0.012 0.01 0.01 0.041 0.004 0.039 0.016 0 2.5 5 mm scale so8: plastic small outline package; 8 leads; body width 3.9 mm sot96-1 99-12-27 03-02-18
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 15 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer fig 17. package outline sot505-1 (tssop8) unit a 1 a max. a 2 a 3 b p l h e l p wy v ce d (1) e (2) z (1) q references outline version european projection issue date iec jedec jeita mm 0.15 0.05 0.95 0.80 0.45 0.25 0.28 0.15 3.1 2.9 3.1 2.9 0.65 5.1 4.7 0.70 0.35 6 0 0.1 0.1 0.1 0.94 dimensions (mm are the original dimensions) notes 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic or metal protrusions of 0.25 mm maximum per side are not included. 0.7 0.4 sot505-1 99-04-09 03-02-18 w m b p d z e 0.25 14 8 5 q a a 2 a 1 l p (a 3 ) detail x l h e e c v m a x a y 2.5 5 mm 0 scale tssop8: plastic thin shrink small outline package; 8 leads; body width 3 mm sot505-1 1.1 pin 1 index
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 16 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer fig 18. package outline sot996-2 (xson8u) references outline version european projection issue date iec jedec jeita sot996-2 - - - - - - sot996-2 07-12-18 07-12-21 unit a max mm 0.5 0.05 0.00 0.35 0.15 3.1 2.9 0.5 1.5 0.5 0.3 0.6 0.4 0.1 0.05 a 1 dimensions (mm are the original dimensions) xson8u: plastic extremely thin small outline package; no leads; 8 terminals; utlp based; body 3 x 2 x 0.5 mm 0 1 2 mm scale b d 2.1 1.9 e e e 1 l l 1 0.15 0.05 l 2 v w 0.05 y y 1 0.1 c y c y 1 x b 14 85 e 1 e a c b v m c w m l 2 l 1 l terminal 1 index area b a d e detail x a a 1
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 17 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 13. soldering of smd packages this text provides a very brief insight into a complex technology. a more in-depth account of soldering ics can be found in application note an10365 surface mount re?ow soldering description . 13.1 introduction to soldering soldering is one of the most common methods through which packages are attached to printed circuit boards (pcbs), to form electrical circuits. the soldered joint provides both the mechanical and the electrical connection. there is no single soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mount devices (smds) are mixed on one printed wiring board; however, it is not suitable for ?ne pitch smds. re?ow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 13.2 wave and re?ow soldering wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. the wave soldering process is suitable for the following: ? through-hole components ? leaded or leadless smds, which are glued to the surface of the printed circuit board not all smds can be wave soldered. packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. also, leaded smds with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased probability of bridging. the re?ow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature pro?le. leaded packages, packages with solder balls, and leadless packages are all re?ow solderable. key characteristics in both wave and re?ow soldering are: ? board speci?cations, including the board ?nish, solder masks and vias ? package footprints, including solder thieves and orientation ? the moisture sensitivity level of the packages ? package placement ? inspection and repair ? lead-free soldering versus snpb soldering 13.3 wave soldering key characteristics in wave soldering are: ? process issues, such as application of adhesive and ?ux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave ? solder bath speci?cations, including temperature and impurities
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 18 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 13.4 re?ow soldering key characteristics in re?ow soldering are: ? lead-free versus snpb soldering; note that a lead-free re?ow process usually leads to higher minimum peak temperatures (see figure 19 ) than a snpb process, thus reducing the process window ? solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board ? re?ow temperature pro?le; this pro?le includes preheat, re?ow (in which the board is heated to the peak temperature) and cooling down. it is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). in addition, the peak temperature must be low enough that the packages and/or boards are not damaged. the peak temperature of the package depends on package thickness and volume and is classi?ed in accordance with t ab le 8 and 9 moisture sensitivity precautions, as indicated on the packing, must be respected at all times. studies have shown that small packages reach higher temperatures during re?ow soldering, see figure 19 . table 8. snpb eutectic process (from j-std-020c) package thickness (mm) package re?ow temperature ( c) volume (mm 3 ) < 350 3 350 < 2.5 235 220 3 2.5 220 220 table 9. lead-free process (from j-std-020c) package thickness (mm) package re?ow temperature ( c) volume (mm 3 ) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 19 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer for further information on temperature pro?les, refer to application note an10365 surface mount re?ow soldering description . 14. abbreviations msl: moisture sensitivity level fig 19. temperature pro?les for large and small components 001aac844 temperature time minimum peak temperature = minimum soldering temperature maximum peak temperature = msl limit, damage level peak temperature table 10. abbreviations acronym description cdm charged-device model esd electrostatic discharge hbm human body model i 2 c-bus inter-integrated circuit bus i/o input/output ic integrated circuit lsb least signi?cant bit mm machine model por power-on reset smbus system management bus
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 20 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 15. revision history table 11. revision history document id release date data sheet status change notice supersedes PCA9540B_4 20090903 product data sheet - PCA9540B_3 modi?cations: ? added xson8u package offering (affects section 2 f eatures last bullet item, t ab le 1 order ing inf or mation , section 5.1 pinning , and section 12 p ac kage outline ). PCA9540B_3 20090528 product data sheet - PCA9540B_2 PCA9540B_2 (9397 750 13731) 20040929 product data sheet - PCA9540B_1 PCA9540B_1 (9397 750 12918) 20040413 product data - -
PCA9540B_4 ? nxp b.v. 2009. all rights reserved. product data sheet rev. 04 3 september 2009 21 of 22 nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer 16. legal information 16.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term short data sheet is explained in section de?nitions. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple dev ices. the latest product status information is available on the internet at url http://www .nxp .com . 16.2 de?nitions draft the document is a draft version only. the content is still under internal review and subject to formal approval, which may result in modi?cations or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. short data sheet a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request via the local nxp semiconductors sales of?ce. in case of any inconsistency or con?ict with the short data sheet, the full data sheet shall prevail. 16.3 disclaimers general information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. right to make changes nxp semiconductors reserves the right to make changes to information published in this document, including without limitation speci?cations and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use nxp semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customers own risk. applications applications that are described herein for any of these products are for illustrative purposes only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the speci?ed use without further testing or modi?cation. limiting values stress above one or more limiting values (as de?ned in the absolute maximum ratings system of iec 60134) may cause permanent damage to the device. limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the characteristics sections of this document is not implied. exposure to limiting values for extended periods may affect device reliability. terms and conditions of sale nxp semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www .nxp .com/pro? le/ter ms , including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by nxp semiconductors. in case of any inconsistency or con?ict between information in this document and such terms and conditions, the latter will prevail. no offer to sell or license nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. export control this document as well as the item(s) described herein may be subject to export control regulations. export might require a prior authorization from national authorities. 16.4 trademarks notice: all referenced brands, product names, service names and trademarks are the property of their respective owners. i 2 c-bus logo is a trademark of nxp b.v. 17. contact information for more information, please visit: http://www .nxp.com for sales of?ce addresses, please send an email to: salesad dresses@nxp.com document status [1] [2] product status [3] de?nition objective [short] data sheet development this document contains data from the objective speci?cation for product development. preliminary [short] data sheet quali?cation this document contains data from the preliminary speci?cation. product [short] data sheet production this document contains the product speci?cation.
nxp semiconductors PCA9540B 2-channel i 2 c-bus multiplexer ? nxp b.v. 2009. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com date of release: 3 september 2009 document identifier: PCA9540B_4 please be aware that important notices concerning this document and the product(s) described herein, have been included in section legal information. 18. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 ordering information . . . . . . . . . . . . . . . . . . . . . 2 4 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5 pinning information . . . . . . . . . . . . . . . . . . . . . . 3 5.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 functional description . . . . . . . . . . . . . . . . . . . 4 6.1 device addressing . . . . . . . . . . . . . . . . . . . . . . 4 6.2 control register . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2.1 control register de?nition . . . . . . . . . . . . . . . . . 4 6.3 power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . 5 6.4 voltage translation . . . . . . . . . . . . . . . . . . . . . . 5 7 characteristics of the i 2 c-bus. . . . . . . . . . . . . . 6 7.1 bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.2 start and stop conditions . . . . . . . . . . . . . . 6 7.3 system con?guration . . . . . . . . . . . . . . . . . . . . 7 7.4 acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.5 bus transactions . . . . . . . . . . . . . . . . . . . . . . . . 8 8 application design-in information . . . . . . . . . . 8 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 9 10 static characteristics. . . . . . . . . . . . . . . . . . . . 10 11 dynamic characteristics . . . . . . . . . . . . . . . . . 12 12 package outline . . . . . . . . . . . . . . . . . . . . . . . . 14 13 soldering of smd packages . . . . . . . . . . . . . . 17 13.1 introduction to soldering . . . . . . . . . . . . . . . . . 17 13.2 wave and re?ow soldering . . . . . . . . . . . . . . . 17 13.3 wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 17 13.4 re?ow soldering . . . . . . . . . . . . . . . . . . . . . . . 18 14 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 19 15 revision history . . . . . . . . . . . . . . . . . . . . . . . . 20 16 legal information. . . . . . . . . . . . . . . . . . . . . . . 21 16.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 21 16.2 de?nitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 16.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 16.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 17 contact information. . . . . . . . . . . . . . . . . . . . . 21 18 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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