STMPE2401 is a 24-bit Enhanced port expander with Keypad and PWM controller features. It features 24 GPIOs, 1.8V operating voltage, hardware key pad controller (max 8*12 matrix), 3 PWM (8 bit) outputs for LED brightness control and blinking, interrupt output (open drain) pin, configurable hotkey feature on each GPIO and ultra-low Standby-mode current.