![]() Devices can be chosen with 4-bit, 8-bit or 16-bit width. About 20 different devices can be chosen from two sub-families, commonly called ‘quasi bi-directional General Purpose I/Os’ and ‘totem-pole General Purpose I/Os’. IC, SM I/O EXPANDER 8-BITįamily overview The Philips family of I2C/SMBus General Purpose parallel Input/Output (GPIO) devices provides a simple solution for application requiring more I/Os. There is a small potentiometer onboard, which can adjust the backlight of LCD1602 or LCD2004, and a jumper cap to control the switch of the LED light. The PCF8574T IO Expansion Board features allowing the use of multi module connected to the I2C bus at the same time by connecting the pinheader and connector. ![]() Up to 8 PCF8574T IO Expansion Board can be connected to the I2C-bus, providing up to 64 I/O ports. The PCF8574T IO Expansion Board is used as remote 8-bit I/O expander for I2C-bus.
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