ST Life.augmented


Capacitive touch daughterboard based on the STMPE821

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.

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.

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.

pdf Download
Data Brief

Key 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


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB0973: Capacitive touch daughterboard based on the STMPE821
1.1 98 KB

User Manual

Description Version Size
UM0868: STM32-based STMPE821 capacitive touch demonstration kit
1.1 1,042 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
Gerber files for STEVAL-ICB002V1 board
1.0 230 KB

Bill of Materials

Description Version Size
BOM for STEVAL-ICB002V1 board
1.0 8 KB

Schematic Pack

Description Version Size
Board schematics for STEVAL-ICB002V1
1.0 27 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STSW-ICB002 STMPE821 capacitive touck key controller demo board setup

License Agreement

Description Version Size
Demo products licence agreement
1.0 22 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ICB002V1NRNDSTMPE821QTRBuy Direct57.87Distributor reported inventory date: 2014-04-16
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA120

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Feedback Form
Customer Feedback