Description
The STMPE16M31 and STMPE24M31 capacitive touchkey controllers offer highly versatile and flexible capacitive sensing capabilities in one single chip. The devices integrate up to 24 capacitive sensing channels which are highly sensitive and noise tolerant. Two units of hardwired ratiometric engines enable the implementation of a slider/wheel without external computations. 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 STMPE24M31 device can be used to implement a complete notebook multimedia control bar with eight capacitive touchkeys, an 8channel slider with 256 steps resolution and eight independently controlled LED. QFN40 (5 x 5 mm) QFN32 (4 x 4 mm)

Features
■ Up to 24 capacitive sensor inputs
■ Independent and configurable automatic calibration on all channels
■ 15 fF resolution, 512 steps with 30 pF auto- tuning
■ Up to 30 pF external reference capacitor
■ 2 units of 8-input ratiometric engines supporting 256 steps slider/wheel
■ 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: 400 µA in active mode, 50 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
■ 200V MM ESD protection on all pins

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