1. PCF8574 — Remote 8-bit I/O expander for I2C-bus|
The device consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCF8574 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. The PCF8574 and PCF8574A versions differ only in their slave address. 24 pages.