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General description

The PCA9537 is a 10-pin CMOS device that provide 4 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I2C/SMBus applications and was developed to enhance the Philips family of I2C I/O expanders. I/O expanders provides a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc.

The PCA9537 consists of a 4-bit Configuration register (Input or Output selection); 4-bit Input register, 4-bit Output 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 or Output 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 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 depowering the device.

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

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Features

  • 4-bit I2C GPIO with interrupt and reset
  • Operating power supply voltage range of 2.3 to 5.5 V
  • 5 V tolerant I/Os
  • Polarity inversion register
  • Active LOW interrupt output
  • Active LOW reset input
  • Low stand-by current
  • Noise filter on SCL/SDA inputs
  • No glitch on power-up
  • Internal power-on reset
  • 4 I/O pins which default to 4 inputs
  • 0 kHz 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

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Products/packages

Type numberNorth American Type numberOrdering code (12NC)Product statusPackagePackingMarkingChemical contentLeadfree conversion date
PCA9537DPPCA9537DP-T9352 774 95118Volume productionSOT552-1
(TSSOP10) 		Reel Pack, SMD, 13"Standard MarkingPCA9537DP
week 13, 2005

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Pricing/ordering/availability

Type numberOrdering code(12NC)Indicative price/unit($)RegionDistributorIn stockInventory dateBuy onlineSamples
PCA9537DP9352 774  95118  0.6500NADIGI-KEY CORPORATION2,8967/18/2008 Buy online Order samples
   NADIGI-KEY CORPORATION2,5007/18/2008 Buy online  
   NAMOUSER ELECTRONICS2,5007/16/2008 Buy online  
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Block diagrams/pinning

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Technical documents

Application Notes

AN10441_1; Level shifting techniques in I<sup>2</sup>C-bus design (20-Jun-07)
AN469_2; I2C/SMBus general purpose I/O expanders (20-Jan-05)

Support Documents

75013239; I 2 C Logic Selection Guide (2005-01-12)
75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (13-Jun-06)
UM10204_3; I2C-bus specification and user manual (26-Jun-07)
75015045; World News 14.2 (2005-05-25)
75015669; Your complete choice for I2C-bus peripherals (01-Dec-07)
75014395; Your connection to I 2 C,UART,CAN,and USB Connecting with Philips Wired Connectivity (2005-04-01)

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Parametrics/similar products

Type numberPackageINTERRUPTOperating
temp.(Cel)		# of BitsSource Current per bit(mA)I²C-bus(kHz)Operating voltage(VDC)Weak Pull-Up Current Source Max Sink Current per bit(mA)# of AddressesMax Sink Current
per package(mA)		Reset input pin
PCA9537DPSOT552-1
(TSSOP10)		 0-1 -40~85 4 10 400 2.3~5.5 no internal pull up resistor 25 1 50 Yes
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Similar products

PCA9537 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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