STEVAL-ICB002V1 Capacitive touch daughterboard based on the STMPE821 Features

STEVAL-ICB002V1 Capacitive touch daughterboard based on the STMPE821 Features
STEVAL-ICB002V1
Capacitive touch daughterboard based on the STMPE821
Data brief
Features
■
STM32-based STEVAL-PCC009V3 used as
motherboard
■
Demonstrates up to 3 capacitive touch keys
■
PWM output / GPIO output features
■
Multiple touch detection
■
RoHS compliant
Description
The STEVAL-ICB002V1 daughterboard is based
on the STMPE821 8-channel capacitive touch key
controller. This board connects to the STEVALPCC009V3 interface board, which acts as the
motherboard, to form the STM32-based
capacitive touch demonstration application
designed to evaluate the functioning of the
STMPE821 device.
The STMPE821 is a GPIO (general purpose
input/output) port expander with a built-in
capacitive touchkey controller. The device is
capable of interfacing with a main digital
ASIC/controller using the 2-line communication
protocol I2C.
STEVAL-ICB002V1
Power to the interface board (motherboard) is
provided from a USB Mini-B type connector. The
daughterboard is powered from the motherboard
via the 10-pin connector.
The STM32 microcontroller is used as the main
digital controller to interface the STMPE821
device, and utilizes the capacitive touchkey
controller, GPIO controller and PWM controller
features of the STMPE821 in the application.
The STMPE821 device controls 3 different
touchkeys using the integrated capacitive
touchkey controller. Touch events are indicated on
LEDs using the GPIO controller, and the
corresponding PWM frequency is generated on a
separate LED using the PWM controller.
The STM32-based STEVAL-PCC009V3 interface
board acts as motherboard for the application and
connects to the STEVAL-ICB002V1 via a 10-pin
connector.
February 2010
Doc ID 17190 Rev 1
For further information contact your local STMicroelectronics sales office.
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Schematic diagram
STEVAL-ICB002V1
Schematic diagram
STEVAL-ICB002V1 daughterboard circuit schematic
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STEVAL-ICB002V1
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
25-Feb-2010
1
Changes
Initial release.
Doc ID 17190 Rev 1
3/4
STEVAL-ICB002V1
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