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PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
Rev. 5 — 27 May 2013
Product data sheet
1. General description
The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 100 kHz I2C-bus interface, three hardware address inputs and interrupt output operating between 2.5 V and 6 V. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. System master can read from the input port or write to the output port through a single register.
The low current consumption of 2.
PCF8574 Datasheet
