STMPE811_09 Datasheet, PDF (1/64 Pages) STMicroelectronics – Advanced resistive touch screen controller with 8-bit GPIO expander

STMPE811
Advanced resistive touch screen controller
with 8-bit GPIO expander
Features
■ 8 GPIOs
■ 1.8 - 3.3 V operating voltage
■ Integrated 4-wire touch screen controller
■ Interrupt output pin
■ Wakeup feature on each I/O
■ SPI and I²C interface
■ Up to 2 devices sharing the same bus in
I²C mode (1 address line)
■ 8-input 12-bit ADC
■ 128-depth buffer touch screen controller
■ Touch screen movement detection algorithm
■ 25 kV air-gap ESD protection (system level)
■ 4 kV HBM ESD protection (device level)
Applications
■ Portable media players
■ Game consoles
■ Mobile and smartphones
■ GPS
QFN16
(3x3)
Description
The STMPE811 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 STMPE811 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.
A 4-wire touch screen controller is built into the
STMPE811. The touch screen controller is
enhanced with a movement tracking algorithm (to
avoid excessive data), a 128 x 32 bit buffer and
programmable active window feature.
Table 1. Device summary
Order code
STMPE811QTR
April 2009
Package
QFN16
Doc ID 14489 Rev 2
Packaging
Tape and reel
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