Contactless Position Sensor for Variable Speed Trigger Switch w/ <65μA Consumption Reference Design

(ACTIVE) TIDA-00475

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Key Document

Description

The TI Design TIDA-00475 demonstrates contactless, robust, cost effective, position sensing for variable speed trigger switches common in power and garden tools.
The MSP430G2x53 microcontroller determines accurately the trigger position and generates the PWM signal to control motor speed and torque. This capacitive potentiometer enables by design high reliability, long life time, and robust operation in harsh environments. The contactless sensing is inherently neither effected by wear down nor moisture or dirt. Therefore it is an ideal replacement for sensitive resistive potentiometers in cost sensitive applications and resolves their reliability issues in harsh environments.  The very low power standby operation of the system avoids discharge and damage to the battery pack in case of long term storage.

Features
  • Cost-efficient accurate position sensing
  • Robust operation in harsh environment in presence of temperature, humidity, supply voltages variations and electromagnetic disturbances
  • Step-less high resolution speed command
  • Long lifetime of the trigger switch
  • Low operation and standby current

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430G2553  MSP430G2x53, MSP430G2x13 Mixed Signal Microcontroller  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS3839  Ultra-Low Power, Supply Voltage Supervisor  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16  60V, 5µA Iq, 100mA Low-Dropout (LDO) Voltage Regulator With Enable and Power Good  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430G2553 Download
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TPS3839 Download Download
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TPS7A16 Download Download
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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3357 12 May 2016 38
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 386 15 Dec 2015 4
ZIP 2497 15 Dec 2015 6
PDF 1127 15 Dec 2015 2
PDF 224 15 Dec 2015 3
PDF 57 15 Dec 2015 2
PDF 568 15 Dec 2015 37
Related Tools & Software

Software (1)



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