PCA9557 Description
This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. The device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL) and serial data (SDA)]. The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high) registers.
PCA9557 Key Features
- 1 Low Standby Current Consumption of 1 μA Max
- I2C to Parallel Port Expander
- Operating Power-Supply Voltage Range of 2.3 V
- 5-V Tolerant I/O Ports
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins Allow for Use of up
- Lower-Voltage Higher-Performance Migration
- Input/Output Configuration Register
- Polarity Inversion Register
- Active-Low Reset Input