PCA9538

8-bit I2C-bus and SMBus low power I/O port with interrupt and reset


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Product description

The PCA9538 is a 16-pin CMOS device that provides 8 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, LEDs, fans, etc.

The PCA9538 consists of an 8-bit Configuration register (input or output selection), 8-bit Input Port register, 8-bit Output Port register and an 8-bit Polarity Inversion register (active HIGH or active LOW operation). The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input Port or Output Port register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.

The PCA9538 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW, replacement of A2 with RESET and different address range.

The PCA9538 open-drain interrupt output (INT) is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed. The power-on reset sets the registers to their default values and initializes the device state machine. The RESET pin causes the same reset/initialization to occur without de-powering the device.

Two hardware pins (A0 and A1) vary the fixed I2C-bus address and allow up to four devices to share the same I2C-bus/SMBus.

Features

  • 8-bit I2C-bus GPIO with interrupt and reset
  • Operating power supply voltage range of 2.3 V to 5.5 V
  • 5 V tolerant I/Os
  • Polarity Inversion register
  • Active LOW interrupt output
  • Active LOW reset input
  • Low standby current
  • Noise filter on SCL/SDA inputs
  • No glitch on power-up
  • Internal power-on reset
  • 8 I/O pins which default to 8 inputs
  • 0 Hz to 400 kHz clock frequency
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Offered in three different packages: SO16, TSSOP16 and HVQFN16
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: PCA9538BS, PCA9538D, PCA9538PW
Block diagram: PCA9538BS, PCA9538D, PCA9538PW

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
PCA9538BSPCA9538BS,1189352 774 17118Volume productionSOT629-1
(HVQFN16) 		Reel Pack, SMD, 13"Standard Marking
PCA9538DPCA9538D,1129352 774 18112Volume productionSOT162-1
(SO16) 		TubeStandard Marking
PCA9538DPCA9538D,1189352 774 18118Volume productionSOT162-1
(SO16) 		Reel Pack, SMD, 13"Standard Marking
PCA9538PWPCA9538PW,1129352 774 19112Volume productionSOT403-1
(TSSOP16) 		TubeStandard Marking
PCA9538PWPCA9538PW,1189352 774 19118Volume productionSOT403-1
(TSSOP16) 		Reel Pack, SMD, 13"Standard Marking
PCA9538PW/Q900-9352 968 62118DevelopmentSOT403-1
(TSSOP16) 		Reel Pack, SMD, 13"Standard Marking

Parametrics of this product

Type numberPackage# of BitsINTERRUPTSource Current per bit(mA)Weak Pull-Up Current Source Max Sink Current per bit(mA)Operating voltage(VDC)I²C-bus(kHz)Operating
temp.(Cel)		# of AddressesMax Sink Current
per package(mA)		Reset input pin
PCA9538BSSOT629-1
(HVQFN16)		8yes10no internal pull up resistor252.3~5.5400-40~854100Yes
PCA9538DSOT162-1
(SO16)		8yes10no internal pull up resistor252.3~5.5400-40~854100Yes
PCA9538PWSOT403-1
(TSSOP16)		8yes10no internal pull up resistor252.3~5.5400-40~854100Yes

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9538BSPCA9538BS,118PCA9538BSAlways Pb-free11
PCA9538DPCA9538D,112PCA9538Dweek 13, 200511
PCA9538DPCA9538D,118PCA9538Dweek 13, 200511
PCA9538PWPCA9538PW,112PCA9538PWweek 13, 200511
PCA9538PWPCA9538PW,118PCA9538PWweek 13, 200511
PCA9538PW/Q900-PCA9538PW/Q900Always Pb-free11
Quality and reliability disclaimer

Quality and reliability disclaimer

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Documentation for this product

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA9538BS9352 774 17118PCA9538BS,118ASARROW ASIA PAC LTD12,0002/6/2012Buy online 
   NADIGI-KEY CORPORATION11,4482/7/2012Buy online 
   NAAVNET ELECTRONICS MARKETING10,7852/7/2012Buy online 
   NAARROW ELECTRONICS5,1152/6/2012Buy online 
   NAMOUSER ELECTRONICS9672/7/2012Buy online 
   NAMOUSER ELECTRONICS9672/7/2012Buy online 
   NAFUTURE ELECTRONICS4682/6/2012Buy online 
   JAPANCHIP ONE STOPno02/08/2012Buy online 
PCA9538D9352 774 18112PCA9538D,112EUARROW EUROPE7762/3/2012Buy onlinenot available
   JAPANCHIP ONE STOPno02/08/2012Buy online 
PCA9538D9352 774 18118PCA9538D,118NADIGI-KEY CORPORATION3,1642/7/2012Buy online 
   ASARROW ASIA PAC LTD1,0002/6/2012Buy online 
   NAAVNET ELECTRONICS MARKETING2002/7/2012Buy online 
   NAMOUSER ELECTRONICS1882/7/2012Buy online 
   NAMOUSER ELECTRONICS1882/7/2012Buy online 
   NAFUTURE ELECTRONICS422/6/2012Buy online 
   JAPANCHIP ONE STOPyes02/08/2012Buy online 
PCA9538PW9352 774 19112PCA9538PW,112EUFUTURE ELECTRONICS UK4,4162/6/2012Buy onlinenot available
   NAARROW ELECTRONICS2,2892/6/2012Buy online 
   NAFUTURE ELECTRONICS8532/6/2012Buy online 
   NAAVNET ELECTRONICS MARKETING8462/7/2012Buy online 
   ASFUTURE ELECTRONICS- ASIA6722/6/2012Buy online 
   JAPANCHIP ONE STOPno02/08/2012Buy online 
PCA9538PW9352 774 19118PCA9538PW,118ASIAWPI5,000250002/07/2012Buy online 
   NAAVNET ELECTRONICS MARKETING2,5102/7/2012Buy online 
   NAARROW ELECTRONICS2,1402/6/2012Buy online 
   NADIGI-KEY CORPORATION1,2392/7/2012Buy online 
   NAMOUSER ELECTRONICS9642/7/2012Buy online 
   NAMOUSER ELECTRONICS9642/7/2012Buy online 
   JAPANCHIP ONE STOPyes02/08/2012Buy online 
PCA9538PW/Q9009352 968 62118-      not available

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