The STMPE2403 is a 24-bit enhanced port expander with keypad and PWM controller. It features 24 GPIOs, 1.8V operating voltage, hardware keypad controller (max 8x12 matrix), 8 special function key support, 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.