PCAL9555A Overview
The PCAL9555A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander with interrupt and weak pull-up resistors for I2C-bus/SMBus applications. NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs, fan control, etc. In addition to providing a flexible set of GPIOs, the...
PCAL9555A Key Features
- I2C-bus to parallel port expander
- Operating power supply voltage range of 1.65 V to 5.5 V
- Low standby current consumption
- 1.5 A (typical at 5 V VDD)
- 1.0 A (typical at 3.3 V VDD)
- Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
- Vhys = 0.10 VDD (typical)
- 5 V tolerant I/Os
- Open-drain active LOW interrupt output (INT)
- 400 kHz Fast-mode I2C-bus
PCAL9555A Applications
- I2C-bus to parallel port expander
- Operating power supply voltage range of 1.65 V to 5.5 V