Capacitive Touch key Controller 12-Pin QFN T/R

The STMPE321 is a 3-channel capacitive touchkey controller. Capacitance measurement is implemented in fully optimized hardware.All 3 I/Os can be configured via an I²C bus to function as either capacitive touchkey, or as GPIOs (general purpose I/O).

• Up to 3 GPIOs
• Up to 3 capacitive touchkey inputs
• Operating voltage 1.65
  • 1.95 V
• Interrupt output pin
• I2C interface (1.8 V operation, 3.3 V tolerant)
• 8 kV HBM ESD protection
• 40 fF resolution, 128
  • step capacitance measurement
• Advanced data filtering (AFS)
• Environment tracking calibration (ETC)
• Individually adjustable touch variance (TVR) settings for all channels
• Adjustable environmental variance (EVR) for optimal calibration
• Capacitive key sensing capability in 27 µA sleep mode