PCA9539; PCA9539R

General description

The PCA9539; PCA9539R is a 24-pin CMOS device that provides 16 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 PCA9539; PCA9539R consists of two 8-bit configuration (input or output selection), input, output and polarity inversion (active HIGH or active LOW operation) registers. 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 read register can be inverted with the Polarity inversion register. All registers can be read by the system master.

The PCA9539; PCA9539R is identical to the PCA9555 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 a different address range.

The PCA9539; PCA9539R 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. In the PCA9539, the RESET pin causes the same reset/default I/O input configuration to occur without de-powering the device, holding the registers and I²C-bus state machine in their default state until the RESET input is once again HIGH. This input requires a pull-up to V_DD. In the PCA9539R however, only the device state machine is initialized by the RESET pin and the internal general-purpose registers remain unchanged. Using the PCA9539R RESET pin will only reset the I²C-bus interface should it be stuck LOW to regain access to the I²C-bus. This allows the I/O pins to retain their last configured state so that they can keep any lines in their previously defined state and not cause system errors while the I²C-bus is being restored.

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

Features

• 16-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
• 16 I/O pins which default to 16 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: SO24, TSSOP24, and HVQFN24

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

Related applications
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10814; Driving stepper motors using NXP I2C-bus GPIO expanders (2009-09-11)

AN469; I2C/SMBus general purpose I/O expanders (2005-01-20)

AN10441; Level shifting techniques in I2C-bus design (2007-06-20)

AN256; PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (2009-03-23)

Support Documents

75016543; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)

UM10206; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

UM10204; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75016535; NXP 4/8/16-bit I²C/SMBus GPIO expanders PCA9536/54/54A/55 (2008-08-01)

UM10267; PCA9698 demonstration board OM6281 (2008-09-26)

Parametrics/similar products

Similar products
PCA9539; PCA9539R 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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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer