STMPE321 Datasheet, PDF (1/40 Pages) STMicroelectronics – Up to 3 capacitive touchkey inputs

STMPE321
3-channel capacitive touchkey controller
Features
■ 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
Applications
■ Mobile phones and smartphones
■ Portable media players
■ Game consoles
QFN12
(2.2 x 1.5 mm)
Description
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).
Table 1. Device summary
Order code
STMPE321QTR
August 2009
Package
QFN12 (2.2 x 1.5 mm)
Doc ID 15791 Rev 3
Packing
Tape and reel
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