ST STMPE821 Manuale utente

January 2010 Doc ID 16826 Rev 1 1/17

UM0868

User manual

STM32-based STMPE821 capacitive touch demonstration kit

Introduction

This user manual describes how to use the STM32-based capacitive touch demonstration

kit to demonstrate the functionality and performance of the STMPE821, an 8-channel

capacitive touch key controller.

The STMPE821 is a GPIO (general-purpose input/output) port expander with a built-in

capacitive touch key controller. This device is capable of interfacing with a main digital

ASIC/controller through the 2-line communication protocol I2C.

In this demonstration, the STM32 microcontroller is used as the main digital controller to

interface the STMPE821 device. The system utilizes the capacitive touch key controller,

GPIO controller and PWM controller features of the STMPE821 device to demonstrate the

application.

The STMPE821 device controls 3 different touch keys using an integrated capacitive touch

controller. Touch events are indicated on the LEDs using the GPIO controller and the

corresponding PWM frequency is generated on a separate LED using the PWM controller.

The demonstration requires two boards, connected using a 10-pin connector:

■STEVAL-PCC009V3 S-Touch family interface board based on the STM32

■STEVAL-ICB002V1 capacitive touch demonstration board based on the STMPE821

Power to the STM32-based interface board is provided by a USB mini B-type connector, and

power to the capacitive touch board is supplied by the STM32 interface board via the 10-pin

connector.

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Contents UM0868

2/17 Doc ID 16826 Rev 1

Contents

1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3.2 Jumper/connector settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Running the demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Working in DFU mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Appendix A Schematic diagrams and bill of material . . . . . . . . . . . . . . . . . . . . . 10

A.1 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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UM0868 List of tables

Doc ID 16826 Rev 1 3/17

List of tables

Table 1. Header overlapping for board mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 2. LED indication on touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3. Bill of material for the S-Touch family interface board (STEVAL-PCC009V3) . . . . . . . . . . 12

Table 4. Bill of material for the capacitive touch board (STEVAL-ICB002V1) . . . . . . . . . . . . . . . . . 15

Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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List of figures UM0868

4/17 Doc ID 16826 Rev 1

List of figures

Figure 1. STM32-based STMPE821 capacitive touch demonstration kit. . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. STEVAL-ICB002V1: STMPE821 capacitive touch board . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. STEVAL-PCC009V3: STM32-based interface board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. 10-pin connector J1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5. Enumeration in DFU mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6. S-Touch family interface board schematics (STEVAL-PCC009V3) . . . . . . . . . . . . . . . . . . 10

Figure 7. Capacitive touch board schematics (STEVAL-ICB002V1) . . . . . . . . . . . . . . . . . . . . . . . . . 11

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UM0868 Getting started

Doc ID 16826 Rev 1 5/17

1 Getting started

1.1 System requirements

Only USB power from a PC is required to power up the demonstration board.

1.2 Package contents

The STMPE821 demonstration kit includes the following items:

●Hardware:

– STEVAL-PCC009V3: S-Touch family interface board based on the STM32

– STEVAL-ICB002V1: capacitive touch demonstration board based on the

STMPE821

●Documentation:

–Usermanual

Figure 1. STM32-based STMPE821 capacitive touch demonstration kit

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Getting started UM0868

6/17 Doc ID 16826 Rev 1

1.3 Hardware installation

The capacitive touch STEVAL-ICB002V1 board is shown in Figure 2 below.

Figure 2. STEVAL-ICB002V1: STMPE821 capacitive touch board

The STM32-based STEVAL-PCC009V3 interface board is shown in Figure 3 below.

Figure 3. STEVAL-PCC009V3: STM32-based interface board

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UM0868 Getting started

Doc ID 16826 Rev 1 7/17

1.3.1 Power supply

The demonstration board is directly powered by the USB mini B-type connector (J5 of the

STEVAL-PCC009V3).

1.3.2 Jumper/connector settings

●STEVAL-ICB002V1 capacitive touch board:

– J1: 10-pin connector interface to be connected to J2 of the interface board

(STEVAL-PCC009V3)

Figure 4. 10-pin connector J1

– J3 and J4: support connectors to be connected to J4 and J7, respectively, of the

interface board (STEVAL-PCC009V3)

●STEVAL-PCC009V3 S-Touch family interface board:

– J2: 10-pin connector available as the interface for the STMPE821 board. It has the

same electrical connections as those shown in Figure 4 above

– J4 and J7: support connectors for J4 and J3 of STMPE821 capacitive touch board

– J3: standard 20-pin JTAG connector available on the demonstration board. It can

be used to test the board in debug mode using any JTAG-based debugger for an

STM32 device. This connector is not mounted on board.

– J6: to enable the 3.3 V supply to the board. To be connected in 1-2 position

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Running the demonstration UM0868

8/17 Doc ID 16826 Rev 1

2 Running the demonstration

To run the demonstration perform the following steps:

1. Mount the STMPE821 capacitive touch board (STEVAL-ICB002V1) on the S-Touch

family interface board (STEVAL-PCC009V3). When mounting the boards, the

connectors should mate perfectly as shown in Ta bl e 1 .

2. Connect the two boards as indicated in table above.

3. Connect the interface board to the PC with the USB mini B-type cable.

LED D1 glows on this board. On power-up, all 4 LEDs on the capacitive touch board glow for

a moment. Upon touching a single pad or multiple pads, the corresponding LED glows (see

table below):

LED4 blinks with a unique PWM frequency for each touch event.

Note: The user can touch multiple LEDs at the same time. The corresponding LED glows to

indicate all touch pads, and LED4 glows with a particular PWM frequency.

Table 1. Header overlapping for board mapping

STEVAL-ICB002V1 (touch board) STEVAL-PCC009V3(STM32 board)

J3 J7

J4 J4

J1 J2

Table 2. LED indication on touch

Touch event LED

Button A LED1

Button B LED2

Button C LED3

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UM0868 Working in DFU mode

Doc ID 16826 Rev 1 9/17

3 Working in DFU mode

The required DFU setup (DFuSe) is available for download from the STMicroelectronics web

site at http://www.st.com/mcu/familiesdocs-110.html, under section “Software-PC”.

After installing the setup, plug in the board. When the PC prompts for a driver, follow the

path: Program Files\STMicroclectronics\DFUSe\Driver, and select the driver

The user manual for the DFU GUI is available at the same link.

To work in DFU mode, remove the mini USB cable from the STM32-based interface board

and power it down.

Short pin 9 and 11 of J4 by connecting the 2-pin jumper mounted on J4 of the STEVAL-

PCC009V3 board. Then, connect the mini USB cable. At this point the board should be

enumerated and listed in the device manager window, as shown in Figure 5. If this does not

occur, please contact the technical support.

Figure 5. Enumeration in DFU mode

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Schematic diagrams and bill of material UM0868

10/17 Doc ID 16826 Rev 1

Appendix A Schematic diagrams and bill of material

A.1 Schematic diagrams

Figure 6. S-Touch family interface board schematics (STEVAL-PCC009V3)

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