PCA9554/PCA9554A

General description

The PCA9554 and PCA9554A are 16-pin CMOS devices that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications and were developed to enhance the NXP Semiconductors family of I²C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.

The PCA9554/PCA9554A consist 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 read register can be inverted with the Polarity Inversion register. All registers can be read by the system master. Although pin-to-pin and I²C-bus address compatible with the PCF8574 series, software changes are required due to the enhancements and are discussed in Application Note AN469.

The PCA9554/PCA9554A 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.

Three hardware pins (A0, A1, A2) vary the fixed I²C-bus address and allow up to eight devices to share the same I²C-bus/SMBus. The PCA9554A is identical to the PCA9554 except that the fixed I²C-bus address is different allowing up to sixteen of these devices (eight of each) on the same I²C-bus/SMBus.

Features

• 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
• 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
• Packages offered: DIP16, SO16, SSOP16, SSOP20, TSSOP16, HVQFN16 (2 versions: 4 x 4 x 0.85 mm and 3 x 3 x 0.85 mm), and bare die

Products/packages

Pricing/ordering/availability

Block diagrams/pinning

Design support

Application Notes

AN10146_02; I2C 2002-1A Evaluation Board (2003-02-26)

AN10216_1; I2C manual (2003-03-27)

AN10216_1; I2C manual (2003-03-27)

AN10216_1; I2C manual (2003-03-27)

AN469_2; I2C/SMBus general purpose I/O expanders (2005-01-20)

AN10441_1; Level shifting techniques in I2C-bus design (2007-06-20)

AN256_2; PCA9500/PCA9501 provides simple card maintenance and control using I (2009-03-23)

AN256_2; PCA9500/PCA9501 provides simple card maintenance and control using I (2009-03-23)

AN10148_4; PCA9564 - I2C-bus controller (2004-11-22)

AN10149_2; PCA9564 Evaluation Board (2004-08-19)

Support Documents

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

design_con_2003_tecforum_i2c_bus_overview; DesignCon 2003 TecForum I 2 C Bus Overview (2003-01-27)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

39340011_21; I2C-bus specification (version 2.1) (2000-01-01)

UM10204_3; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75016535; NXP 4/8/16-bit I (2008-08-01)

75016020; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applications (2007-06-01)

75016531; NXP I (2008-07-01)

75015963; NXP evaluation kit for PCA9564 (2007-05-01)

UM10267_1; PCA9698 demonstration board OM6281 (2008-09-26)

Parametrics/similar products

Similar products
PCA9554/PCA9554A 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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