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Single-channel capacitive sensor for touch and proximity detection
  • Obsolete

The STM8T143 is a single channel, fully integrated, touch sensing capacitive sensor. It uses a ProxSense™ charge transfer capacitive acquisition method that is capable of near range proximity detection. The STM8T143 offers a state of the art capacitive sensing engine with an embedded sampling capacitor and voltage regulator allowing the overall solution cost to be reduced and improving system immunity in noisy environments. It can target a detection range up to 20 cm thanks to the electrode parasitic capacitance compensation (EPCC) feature. The EPCC automatically compensates ground parasitic capacitance sources (such as ground planes, printed circuit board tacks, and large metal objects) which significantly reduce the proximity detection range.

The application fields or typical functions with proximity features are various and include: on/off switches, replacement/enhancement, home buttons, backlighting feature on proximity for user interfaces, wakeup or control function on proximity, find-in-the-dark for lighting equipment, and companion device for battery saving in portable equipment.

The device has been designed to be used in applications where proximity is required and touch conditions can prevail for an extended period of time which may result in uncompensated drift in conventional capacitive sensors. Therefore, a process called DYCAL is implemented.

The STM8T143 is an ideal alternative, cost-effective, and extremely low power solution to replace conventional infrared optical proximity sensors. Capacitive sensing technology is not sensitive to sunlight or artificial light effects. The STM8T143 offers a much lower consumption (12 μA range versus 100 μA range) and a small form factor (DFN8 2*3*0.65 mm). Lastly, there is no need for a clear opening on the bezel to let light pass through.

The STM8T143 is offered in 8-pin packages and features both touch and proximity sensing outputs.

The STM8T143 touch pad can sense through almost any dielectric and thereby allows the electronics to be contained in a sealed enclosure.

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Key Features

  • Touch and short range proximity detection
  • Internal sampling capacitor
  • On-chip integrated voltage regulator
  • Automatic electrode tuning (AET)
  • Electrode parasitic capacitance compensation (EPCC)
  • Dynamic calibration (DYCAL™)
  • Environment control system (ECS)
  • User programmable options include:
  • Configurable output modes
  • Configurable sensitivity levels
  • Data streaming mode
  • Low power management
  • Operating supply voltage: 2.3 V to 5.5 V
  • Supported interface:
  • Individual key state output
  • Single wire data interface
  • Operating temperature: -40 to +85 °C
  • ECOPACK®2 8-pin SO and 8-pin UFDFPN packages

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS7058: Single-channel capacitive sensor for touch and proximity detection
7.0 1,111 KB

Application Notes

Description Version Size
AN1709: EMC design guide for ST microcontrollers
1.7 657 KB
AN2658: Using the analog to digital converter of the STM8S microcontroller
2.3 183 KB
AN2719: Precision improvement techniques for the A/D converter of the STM8 microcontroller
2.5 237 KB
AN2869: Guidelines for designing touch sensing applications
6.1 977 KB
AN2927: RC acquisition principle for touch sensing applications
2.4 156 KB
AN2970: STM8T14x ProxSense™ charge transfer capacitive sensing technology
2.0 373 KB
AN3150: Guidelines to optimize proximity detection with STM8T141 and STM8T143 capacitive sensors
3.0 861 KB
AN3181: Guidelines for obtaining IEC 60335 Class B certification in an STM8 application
2.0 428 KB
AN3431: How to design a PresSense pressure touch button
1.2 347 KB
AN3960: ESD considerations for touch sensing applications
1.1 634 KB

Technical Notes & Articles

Description Version Size
TN0900: Interfacing STM8T143 output in open-drain mode
1.0 62 KB
TN1205: Tape and reel shipping media for STM8 and STM32 microcontrollers in FPN packages
3.0 753 KB
TN1206: Tape and reel shipping media for STM8 and STM32 microcontrollers in QFP packages
3.0 831 KB
TN1207: Tape and reel shipping media for STM8 and STM32 microcontrollers in SO packages
1.0 755 KB
TN1208: Tape and reel shipping media for STM8 and STM32 microcontrollers in TSSOP and SSOP packages
1.0 743 KB

User Manual

Description Version Size
UM0470: STM8 SWIM communication protocol and debug module
3.4 532 KB

Programming Manual

Description Version Size
PM0083: How to program STM8T143 OTP options
3.0 406 KB

Errata Sheet

Description Version Size
ES0008: STM8T143 device limitations
3.2 194 KB

Device Option List

Description Version Size
STM8T143 option list
5.0.0 1 KB

Presentations & Training Material


Description Version Size
STM32 and STM8 embedded software solutions
2.0 2,415 KB

Related Tools and Software

Related Tools and Software

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IDEA Cosmic's toolchain for the STM8 family is part of a complete and uniform product line incorporating over 20 years of innovative design and development. Cosmic tools for STM8, 32K Special Edition limited to 32K bytes of code, one year free license available at Cosmic.
STSW-STM8064 Setup screensaver STM8 1024x768
STSW-STM8062 STM8 in-application programming (IAP) using a customized bootloader (AN2659)
STSW-STM8065 Setup screensaver STM8 1280x1024
RIDE Raisonance branded integrated development environment for MCUs
STSW-STM8049 Basic in-application programming example using the STM8 I2C and SPI peripherals (AN2737)
STSW-STM8006 Example of implementation of user bootloader (AN2659)
TAP-KNX-KAIStack KNX home automation for STM8 and STM32, from Tapko Technologies GMBH
STVP ST Visual Programmer for programming ST7, STM8 and STM32
STSW-STM8075 Guidelines for obtaining IEC 60335 Class B certification in an STM8 application (AN3181)
STVD ST Visual develop IDE for developing ST7 and STM8 applications
STSW-STM8004 STM8 optimized I2C examples (AN3281)

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