Description
The STMPE16M31PX capacitive touchkey controllers offer highly versatile and flexible capacitive sensing capabilities in one single chip. The devices integrate up to 16 capacitive sensing channels which are highly sensitive and noise tolerant. Eight independent PWM controllers allow to control up to 16 LEDs with brightness control, ramping and blinking capabilities. The I2C interface supports up to 400 kHz communication with the system host. A very wide dynamic range allows most applications to work without hardware tuning. A single STMPE16M31PX device can be used to implement a complete notebook multimedia control bar with eight capacitive touchkeys, proximity sensor with sensitivity up to 5 cm and eight independently controlled LED. QFN32 (4 x 4 mm)

Features
■ Up to 16 capacitive sensor inputs
■ Independent and configurable automatic calibration on all channels
■ Proximity sensing capability for over 3 cm distance
■ 15 fF resolution, 512 steps with 30 pF auto- tuning
■ Up to 30 pF external reference capacitor
■ PWM and GPIO: – Up to 16 general purpose inputs/outputs – 8 independent PWM controllers, up to 16 PWM outputs – 12 mA sourcing/sinking on GPIO for LED driving (at 3.3 V VIO) – Maximum source/sink current 120 mA
■ Operating voltage: – 1.65 - 1.95 V (VCC, internally supplied) – 2.7- 5.5 V(VIO)
■ Low operating current: 300 µA in active mode, 40 µA in sleep mode and 5 µA in hibernate mode
■ I2C interface (up to 400 kHz). I2C is 3.3 V tolerant
■ 8 kV HBM ESD protection on all sensing pins

Applications
■ Multimedia bars in notebook computers
■ Portable media players and game consoles
■ Mobile phones and smartphones