STMPE821_09 Datasheet, PDF (1/55 Pages) STMicroelectronics – 8-channel capacitive touch key controller

STMPE821
8-channel capacitive touch key controller
Features
■ Up to 8 GPIOs
■ Up to 8 capacitive touch key inputs
■ Operating voltage 2.7- 3.6
■ Internal regulator
■ Interrupt output pin
■ I²C interface (1.8 V operation, 3.3 V tolerant)
■ 8 kV HBM ESD protection
■ 50 fF resolution, 128 steps capacitance
measurement
■ Advanced data filtering (AFS)
■ Environment tracking calibration (ETC)
■ Individually adjustable touch variance (TVR)
setting for all channels
■ Adjustable environmental variance (EVR) for
optimal calibration
■ Capacitive key sensing capability in 25 μA
sleep mode
Applications
■ Mobile and smartphones
■ Portable media players
■ Game consoles
QFN16
(2.6 x 1.8 mm)
Description
The STMPE821 is an 8-channel capacitive touch
key controller. The capacitance measurement is
implemented fully in optimized hardware.
All 8 I/Os could be configured via I²C bus to
function as either capacitive touch key, or GPIO
(general purpose I/O).
Table 1. Device summary
Order code
STMPE821QTR
April 2009
Package
QFN16 (2.6 x 1.8 mm)
Rev 4
Packing
Tape and reel
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