ST STMPE821 User manual
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.
www.st.com
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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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UM0868 Schematic diagrams and bill of material
Doc ID 16826 Rev 1 11/17
Figure 7. Capacitive touch board schematics (STEVAL-ICB002V1)
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UM0868 Schematic diagrams and bill of material
Doc ID 16826 Rev 1 12/17
Table 3. Bill of material for the S-Touch family interface board (STEVAL-PCC009V3)
Category Ref. Des. Component description Package Manufacturer Manufacturer order code /
orderable part number Supplier
ST devices
U1 ESDALC6V1M3 SOT883 STMicroelectronics ESDALC6V1M3 STMicroelectronics
U11 LD1117D33TR SO-8 STMicroelectronics LD1117D33TR STMicroelectronics
U5,U10 ST2349QTR (not
mounted) QFN16 STMicroelectronics ST2349QTR (not mounted) STMicroelectronics
U2 STM32F103VBT6 LQFP100 STMicroelectronics STM32F103VBT6 STMicroelectronics
U9 USBLC6-2P6 SOT-666 STMicroelectronics USBLC6-2P6 STMicroelectronics
U3,U4,U6,U7,U8 ESDALC6V1M6 µQFN16 STMicroelectronics ESDALC6V1M6 STMicroelectronics
Crystal and
oscillator
Y2 8 MHz 11.35 x 4.5 mm
crystal ECS Inc X1094-ND
Y1 32.768 kHz Through-hole Abracon AB38T-32.768 kHZ
Connectors
and jumpers
J1 SPI_CON10A
Header 2x5 pin,
2.54 mm x 2.54
mm Pitch
Protectron P9403-10-21 Protectron
J2 JTAG_20PIN (not
mounted)
Header 2x10 pin,
2.54 mm x 2.54
mm pitch
Protectron Protectron
J3 USB-B USB mini B-type Samtec Any Samtec
J4,J7 30 pin connector Support Protectron P9105-30-21 Protectron
J5 Power selection jumper Jumper 1x3 pin,
2.54 mm pitch Any Any Any
J6 Mode selection jumper Jumper 1x2 pin,
2.54 mm pitch Any Any Any
SW2 RESET switch Push button (not
mounted) Any Any Any
LEDs D1 LED 3 mm SMD LED Lite-On Inc 160-1176-1-ND Digi-Key
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Schematic diagrams and bill of material UM0868
13/17 Doc ID 16826 Rev 1
Capacitors
C1,C2 10 pF SMD0805 Any N.A. Any
C3,C11,C12,C13,
C14,C15,C16,C22
,C25,C26,C27
100 nF SMD0805 Any N.A. Any
C4,C5 22 pF SMD0805 Any N.A. Any
C6,C7,C17,C18 0.1 µF SMD0805 Any N.A. Any
C9,C21 10 µF SMD0805 Taiyo Yuden 587-1339-2-ND Digi-Key
C10 10 nF SMD0805 Any N.A. Any
C20,C23 4.7 nF SMD0805 Any N.A. Any
C8,C19 1 µF SMD1206 TDK Corporation 445-1383-2-ND Digi-Key
C24,C28 4.7 µF SMD1206 Any Any
Inductors L1 10 µH SMD inductor TDK Corporation 445-1059-1-ND Digi-Key
Table 3. Bill of material for the S-Touch family interface board (STEVAL-PCC009V3) (continued)
Category Ref. Des. Component description Package Manufacturer Manufacturer order code /
orderable part number Supplier
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UM0868 Schematic diagrams and bill of material
Doc ID 16826 Rev 1 14/17
Resistors
R1,R7,R20,R23,
R24 100 kΩSMD0805 Yageo 311-100KARTR-ND Digi-Key
R2,R3,R4,R6,R8,
R9 0 SMD0805 Stackpole
Electronics RMCF1/100RTR-ND Digi-Key
R5,R19 1 MΩSMD0805 Stackpole
Electronics RMCF1/101MJRTRND Digi-Key
R10,R14,R15,R16
,R17 10 kΩSMD0805 Rohm
Semiconductors RHM10.0KCCTND Digi-Key
R18 1.5 ΩSMD0805 Stackpole
Electronics RMCF1/101.5KJRTRND Digi-Key
R21 (DNM) SMD0805 Any N.A. Digi-Key
R22, R25 500 ΩSMD0805 Any N.A. Digi-Key
RN1,RN2, 0 Ωresistor array (4
resistor) 1608 matrix Panasonic-ECG Y9000CT-ND Digi-Key
RN3,RN5, 4.7 kΩresistor array (not
mounted) 1608 matrix Any N.A. Digi-Key
RN7 10 kΩresistor array (4
resistor) 1608 matrix Panasonic-ECG Y9103CT-ND Digi-Key
RN4,RN6 4.7 kΩresistor array (4
resistor) 1608 matrix Yageo YC164J-4.7KCT-ND Digi-Key
Table 3. Bill of material for the S-Touch family interface board (STEVAL-PCC009V3) (continued)
Category Ref. Des. Component description Package Manufacturer Manufacturer order code /
orderable part number Supplier
Downloaded from Elcodis.com electronic components distributor
Schematic diagrams and bill of material UM0868
15/17 Doc ID 16826 Rev 1
Table 4. Bill of material for the capacitive touch board (STEVAL-ICB002V1)
Category Ref. des. Component
description Package Manufacturer
Manufacturer order
code / orderable part
number
Supplier
ST devices U1 STMPE821 QFN16 STMicroelectronics STMPE821QTR STMicroelectronics
Connectors and
jumpers
J1 Header 5x2 (interface
connector)
5x2 (2.54 mm
pitch) Protectron P9105-10-121 Protectron
J2,J3 CON30 (support
connectors)
15x2 (2.54 mm
pitch) Protectron P9403-30-21 Protectron
LEDs D1,D2,D3,D4 LED (red) 805 Lite-On Inc 160-1176-1-ND Digi-Key
Capacitors
C1,C2,C3,C4,C5 100 pF 805 Phillips 399-1177-1-ND Digi-Key
C6 1 µF 1206 Phillips 445-1383-2-ND Digi-Key
C7 2.2 µF 1206 Phillips 490-3381-1-ND Digi-Key
C8,C9 100 nF 805 Phillips PCC2452TR-ND Digi-Key
Resistors
R1,R2,R3,R4 220 Ω805 Panasonic-ECG P220DACT-ND Digi-Key
R5,R6 10 kΩDNM 805 Rohm semiconductor RHM10.0KCCTND Digi-Key
R7 4.7 kΩ805 Panasonic-ECG P4.7KACT-ND Digi-Key
Downloaded from Elcodis.com electronic components distributor
UM0868
Doc ID 16826 Rev 1 17/17
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