STMPE821 Datasheet, PDF (1/55 Pages) STMicroelectronics – 8-bit Xpander Logic™ with touchkey controller

STMPE821
8-bit Xpander Logic™ with touchkey controller
Preliminary Data
Features
■ Up to 8 GPIOs
■ Up to 8 touchkey capacitive touch inputs
■ Operating voltage 1.8 - 5.5 V
■ Internal regulator
■ Interrupt output pin
■ I²C interface
■ 8 kV HBM ESD protection
■ 40 fF resolution, 128 steps capacitance
measurement (5.0 pF dynamic range)
■ Advanced data filtering (AFS)
■ Environment tracking calibration (ETC)
■ Individually adjustable touch variance (TVR)
setting for all channels
■ Adjustable environmental variance (EVR) for
optimal calibration
Applications
■ Mobile and smart phones
■ Portable media players
■ Game consoles
QFN16L
(2.6 x 1.8 mm)
Description
The STMPE821 is a GPIO (general purpose
input/output) port expander able to interface a
main digital ASIC via the two-line bidirectional bus
(I²C).
A separate GPIO expander is often used in
mobile multimedia platforms to solve the
problems of the limited amount of GPIOs typically
available on the digital engine.
The STMPE821 offers great flexibility, as each I/O
can be configured as input, output or specific
functions. The device has been designed with
very low quiescent current and includes a wakeup
feature for each I/O, to optimize the power
consumption of the device.
Table 1. Device summary
Order code
STMPE821QTR
Package
QFN16L (2.6 x 1.8 mm)
Packing
Tape and reel
June 2008
Rev 2
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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