I/O Expanders
Purpose: Increase available GPIOs via I²C, SPI, or other serial interfaces.
- Common Types:
- PCF8574 (I²C, 8-bit)
- MCP23017 (I²C/SPI, 16-bit)
- MAX7317 (SPI, 16-bit)
- TCA9539 (I²C, 16-bit)
- Applications: Keypad scanning, LED control, sensor interfacing.
- Key Features: Low power, interrupt output, configurable pull-ups.
Note: Ideal for microcontrollers with limited GPIOs.