PCA9557 Datasheet (Remote 8-Bit I2C and SMBus Low-Power I/O Expander)

Part: PCA9557
Manufacturer: Texas Instruments
Size: 1.37 MB

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

Other PCA9557 Datasheets

Manufacturer	Part Number	Description
NXP Semiconductors	PCA9557	8-bit I2C and SMBus I/0 port with reset

View all PCA9557 datasheets →

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.