Part number : PCA9555, PCA9555N, PCA9555D, PCA9555DB, PCA9555PW
Function : 16-bit I2C and SMBus I/O port with interrupt
Package : DIP 24 pin, SSOP 24 pin Type
Manufacturer : NXP, Philips Semiconductor, Texas Instruments
Image
Description
The PCA9555 is a 24-pin CMOS device that provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C/SMBus applications and was developed to enhance the Philips family of IC
I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc
Pinout
Features
1. Operating power supply voltage range of 2.3 V to 5.5 V
2. 5 V tolerant I/Os
3. Polarity inversion register
4. Active-LOW interrupt output
5. Low stand-by current
6. Noise filter on SCL/SDA inputs
7. No glitch on power-up
9. Internal power-on reset
10. 16 I/O pins which default to 16 inputs
11. 0 kHz to 400 kHz clock frequency
Applications
1. Servers
2. Routers (Telecom Switching Equipment)
3. Personal Computers
4. Personal Electronics
5. Industrial Automation Equipment
6. Products with GPIO-Limited Processors
Reference site : http://www.bristolwatch.com/arduino/arduino6.htm
PCA9555 Datasheet
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