PCA9537DP

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


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The PCA9537 is a 10-pin CMOS device that provides 4 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 PCA9537 consists of a 4-bit Configuration register (input or output selection), 4-bit Input Port register, 4-bit Output Port register and a 4-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 PCA9537 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.

The I²C-bus address is fixed and allows only one device on the same I²C-bus/SMBus.

Features and benefits

  • 4-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
  • 4 I/O pins that default to 4 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 TSSOP10 package
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: PCA9537DP
Block diagram: PCA9537DP

Parametrics of this product

Type numberPackageNumber of bitsSource Current per bit(mA)I2C-bus(kHz)Operating voltage(VDC)Weak Pull-Up Current SourceMax Sink Current per bit(mA)# of AddressesMax Sink Current, per package(mA)Reset input pinEnableOperating Temperature(Cel)
PCA9537DPSOT552-1
(TSSOP10)		4104002.3~5.5no internal pull up resistor25150Yes-40~85-40~85

Package

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
PCA9537DPPCA9537DP,1189352 774 95118Volume productionSOT552-1
(TSSOP10) 		Reel Pack, SMD, 13"9537

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT552-1TSSOP10plastic thin shri small outline package; 10 leads; body width 3 mm2003-02-18

Related documents

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Reflow soldering

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Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9537DPPCA9537DP,118PCA9537DPweek 13, 20052.05.0E811
Quality and reliability disclaimer

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Documentation for this product

File nameTitleTypeFormatDate
PCA95374-bit I2C-bus and SMBus low power I/O port with interrupt and resetData sheetpdf2009-05-07
AN10441Level shifting techniques in I2C-bus designApplication notepdf2007-06-20
AN256PCA9500/PCA9501 provides simple card maintenance and control using I²C-busApplication notepdf2009-03-23
AN469I2C/SMBus general purpose I/O expandersApplication notepdf2005-01-20
AN10814Driving stepper motors using NXP I2C-bus GPIO expandersApplication notepdf2011-10-24
75016543Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliancesBrochurepdf2008-06-01
75016535Versatile, easy-to-use GPIO expanders; NXP 4/8/16-bit I2C/SMBus GPIO expanders PCA9536/54/54A/55Leafletpdf2008-08-01
75017144I2C Selection Guide 2H 2011Leafletpdf2011-09-29
UM10204I2C-bus specification and user manualUser manualpdf2007-06-26
UM10206I2C Demonstration Board 2005-1 Quick Start GuideUser manualpdf2006-06-13
UM10267PCA9698 demonstration board OM6281User manualpdf2008-09-26
UM10204_JAI2C-bus specification and user manualUser manualpdf2013-04-03

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA9537DP9352 774 95118PCA9537DP,118NADIGI-KEY CORPORATION7,9325/18/2013Buy online 
   NAAVNET EXPRESS AMERICAS4,4865/18/2013Buy online 
   NANEWARK/ELEMENT142,2705/17/2013Buy online 
   EUFarnell Europe2,270105/17/2013Buy online 
   JAPANCHIP ONE STOP2005/17/2013Buy online 
   JAPANCHIP ONE STOP2005/17/2013Buy online 
   ASIAElement 140117/05/2013Buy online 

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