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Introduction
The STM8T141-EVAL is an evaluation kit which introduces developers to
STMicroelectronics STM8T141 touch and proximity capacitive sensor.
It contains an STM8T141 evaluation board, the MB858, plus a set of preconfigured plug-in
modules which can evaluate STM8T141 device performances in either touch or proximity
detection (depending on the module which has been plugged in).
The evaluation kit features are the following:
■
Touch detection with on-board PCB sensing electrode and 1.5 mm dielectric panel
■
Easy dielectric adjustment by stacking acrylic panels
■
Proximity detection with on-board PCB sensing electrode or plug-in antenna
■
Standalone power configuration using an on-board battery
■
External power supply through USB interface
■
Electrode grounding or shielding configured by jumper
Table 1.
Proximity detection range
I
in Normal power mode (typ)
DD
I
DD
October 2010
www.BDTIC.com/ST
STM8T141 main features
Features
Sensing channel
Outputs
Sampling capacitor
Active shield
V
DD
in Low power mode
Packages
Doc ID 15952 Rev 4
User manual
STM8T141-EVAL evaluation kit
STM8T141
1
A few cm
1 (Touch or Proximity)
External
Yes
2.0 to 5.5 V
30 µA
11 µA
SO8 narrow or UFDFPN8 (2 x 3 mm)
UM0742
1/24
www.st.com
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Table of Contents
Related Manuals for ST STM8T141-EVAL
Summary of Contents for ST STM8T141-EVAL
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Page 1: Table 1. Stm8T141 Main Features
User manual STM8T141-EVAL evaluation kit Introduction The STM8T141-EVAL is an evaluation kit which introduces developers to STMicroelectronics STM8T141 touch and proximity capacitive sensor. It contains an STM8T141 evaluation board, the MB858, plus a set of preconfigured plug-in modules which can evaluate STM8T141 device performances in either touch or proximity detection (depending on the module which has been plugged in). -
Page 2: Table Of Contents
Contents Description of the STM8T141-EVAL kit ......5 MB858 evaluation board ........6 1.1.1... - Page 3 Document revision history ..........23 Doc ID 15952 Rev 4 3/24 www.BDTIC.com/ST...
- Page 4 STM8T141-EVAL evaluation kit ........
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Page 5: Description Of The Stm8T141-Eval Kit
UM0742 Description of the STM8T141-EVAL kit Description of the STM8T141-EVAL kit The STM8T141-EVAL kit (see Figure 1) includes: ● 1 STM8T141 evaluation board (MB858) ● 4 STM8T141 preconfigured plug-in modules (MB856) ● 1 antenna shielding cable ● 1 additional 3 mm acrylic panel Figure 1. -
Page 6: Mb858 Evaluation Board
Description of the STM8T141-EVAL kit UM0742 MB858 evaluation board Figure 2 shows the MB858 evaluation board, while Figure 3 Figure 4 show the board top and bottom layout. Figure 2. MB858 evaluation board with STM8T141 module plugged-in MB858 evaluation board... -
Page 7: Module Socket
UM0742 Description of the STM8T141-EVAL kit Figure 4. MB858 evaluation board bottom layout Battery socket USB power connector 1.1.1 Module socket The MB858 evaluation board features an SDIP14 socket to connect the STM8T141 module (see Figure 1.1.2 Power supply The evaluation board can be powered by two different sources: ●... -
Page 8: Copper Planes
Description of the STM8T141-EVAL kit UM0742 1.1.5 Copper planes Two copper planes (CP1, CP2) and one hatched copper plane (HCP) were laid out onto the PCB (see Figure Figure 5. MB858 evaluation board top copper plane Top copper plane (CP1) Figure 6. -
Page 9: Stm8T141 Plug-In Modules
UM0742 Description of the STM8T141-EVAL kit STM8T141 plug-in modules The STM8T141-EVAL includes a set of plug-in modules (see Section 1.1). They allow a quick and simple evaluation of the STM8T141 main features and performances for different option byte configurations: ●... -
Page 10: Table 4. Stm8T141 Module Pin Description
Description of the STM8T141-EVAL kit UM0742 Table 4. STM8T141 module pin description Pin number Pin name Description SHOUT Shield output ELEC Electrode Not connected TOUT/POUT Touch/Proximity output Not connected Capacitive sensing channel pin to external sampling capacitance C Ground Not connected... -
Page 11: Getting Started With The Mb858 Evaluation Board
A 1.5 mm acrylic panel mounted on the MB858 is used as sensing electrode. To demonstrate the detection through various dielectric thicknesses, an additional 3 mm panel, included in the STM8T141-EVAL kit, can be stacked on as shown on Figure... -
Page 12: Figure 9. On-Board Sensing Electrode Configuration
Getting started with the MB858 evaluation board UM0742 Figure 9. On-board sensing electrode configuration ai15076 12/24 Doc ID 15952 Rev 4 www.BDTIC.com/ST... -
Page 13: Installing An External Shielded Antenna
To install an external antenna, remove the jumper on JP1, and plug in the antenna. Figure 10. On-board sensing electrode with external antenna Caution: Grabbing the external shield antenna might result in incorrect system behavior. Doc ID 15952 Rev 4 13/24 www.BDTIC.com/ST... -
Page 14: Shielding And Grounding Configuration
Table 5 shows how to configure the board jumpers for each copper plane. Table 5. Copper plane configuration Copper plane Description Shield connection Ground connection Shield connection Ground connection Shield connection Ground connection 14/24 Doc ID 15952 Rev 4 www.BDTIC.com/ST... -
Page 15: Performance
– USB supply – JP3 connected to shield (SHLD) STM8T141 – Proximity Proximity/touch configuration Proximity detection in the – Low power mode with zoom using external antenna range of 12 cm – USB supply Doc ID 15952 Rev 4 15/24 www.BDTIC.com/ST... -
Page 16: Troubleshooting
LED current stability. occurs in proximity when it is switched on. This – Use the USB power supply with the configuration changes the detection threshold battery removed. and may lock the device on. 16/24 Doc ID 15952 Rev 4 www.BDTIC.com/ST... -
Page 17: Programming Tools
The STM8T141 modules can be programmed using the ST-TSLINK programming dongle and STVP (Visual Programmer) and the STM8T14X-SB socket board (see Figure 11 refer to the STM8T14X-SB data brief). For more information on the STM8T141-EVAL programming tools, visit STMicroelectronics microcontroller support site at http://www.st.com/mcu. -
Page 18: Ordering Information
STM8T14X-SB Socket board for STM8T141 devices. 1. The ST-TSLINK dongle and the STM8T14X-SB socket board are not part of the STM8T141-EVAL evaluation kit, and must consequently be ordered separately. 2. In addition to the STM8T141-EVAL evaluation kit, additional STM8T141 “blank” modules (STM8T141AM- MOD) can be ordered separately, with the device option bytes left unprogrammed. -
Page 19: Schematics
UM0742 Schematics Schematics This section shows the design schematics for the STM8T141-EVAL kit: ● MB858 evaluation board (see Figure ● STM8T141 module (see Figure Doc ID 15952 Rev 4 19/24 www.BDTIC.com/ST... -
Page 20: Figure 13. Stm8T141 Evaluation Board (Mb858)
Schematics UM0742 Figure 13. STM8T141 evaluation board (MB858) 20/24 Doc ID 15952 Rev 4 www.BDTIC.com/ST... -
Page 21: Figure 14. Stm8T141 Module (Mb856)
UM0742 Schematics Figure 14. STM8T141 module (MB856) Doc ID 15952 Rev 4 21/24 www.BDTIC.com/ST... -
Page 22: Reference Documents
Reference documents UM0742 Reference documents ● STM8T141 datasheet ● STM8T14X-SB data brief 22/24 Doc ID 15952 Rev 4 www.BDTIC.com/ST... -
Page 23: Revision History
Changes 10-Sep-2009 Initial release 20-Nov-2009 Minor modification to Section 1.2. 08-Feb-2010 Table 8: updated with an additional problem, cause and remedy. Changed STM8T14X-EVAL to STM8T141-EVAL. 15-Oct-2010 Modified V voltage range in Table 1. Doc ID 15952 Rev 4 23/24 www.BDTIC.com/ST... - Page 24 No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
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