The STMPE811 is a GPIO (General Purpose Input/Output) port expander able to interface a main digital ASIC via the two-line bidirectional bus (I2C). A separate GPIO expander IC is often used in mobile-multimedia platforms to solve the problems of the limited amounts of GPIOs usually available on the digital engine. The STMPE811 offers great flexibility as each I/Os can be configured as input, output or specific functions. The device has been designed with very low quiescent current and includes a wakeup feature for each I/O, to optimize the power consumption of the IC.