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Documents PCA9555
SCPS131G – AUGUST 2005 – REVISED MARCH 2018 PCA9555 Remote 16-Bit I2C and SMBus I/O Expander With Interrupt Output and
Configuration Registers
1 Features 3 Description This 16-bit I/O expander for the two-line bidirectional
bus (I2C) is designed for 2.3-V to 5.5-V VCC
operation. It provides general-purpose remote I/O
expansion for most microcontroller families via the I2C
interface [serial clock (SCL), serial data (SDA)]. 1 Low Standby-Current Consumption of 1 ОјA Max
I2C to Parallel Port Expander
Open-Drain Active-Low Interrupt Output
5-V Tolerant I/O Ports
Compatible With Most Microcontrollers
400-kHz Fast I2C Bus
Address by Three Hardware Address Pins for Use
of up to Eight Devices
Polarity Inversion Register
Latched Outputs With High-Current Drive
Capability for Directly Driving LEDs …
