PCA9673 Overview
The PCA9673 provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plus family. The difference between the PCA9673 and the PCF8575 is that the A2 address pin is replaced by a RESET input on the PCA9673. The device consists of a 16-bit quasi-bidirectional port and an I2C-bus interface.
PCA9673 Key Features
- 1 MHz I2C-bus interface
- pliant with the I2C-bus Fast and Standard modes
- SDA with 30 mA sink capability for 4000 pF buses
- 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
- 16-bit remote I/O pins that default to inputs at power-up
- Latched outputs with 25 mA sink capability for directly driving LEDs
- Total package sink capability of 400 mA
- Active LOW open-drain interrupt output
- 16 programmable slave addresses using 2 address pins
- Readable device ID (manufacturer, device type, and revision)
