TIDA-00475 Reference Design

Texas Instruments

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

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 sensingRobust operation in harsh environment in presence of temperature: humidity: supply voltages variations and electromagnetic disturbancesStep-less high resolution speed commandLong lifetime of the trigger switchLow operation and standby current
Applications
  • Barcode scanner
  • Cordless vacuum cleaner
  • Cordless power tool
  • Mixer
  • blender & food processor
  • Electronic hospital bed & bed control
  • Cordless handheld garden tool
  • Mains powered tools
  • Lawn mower
Product Categories
  • MSP430 ultra-low-power MCUs

Parts

Part Number Name Companion Part
MSP430G2553 MSP430G2553 Buy Datasheet
TPS3839G33 TPS3839G33 Buy Datasheet

Software

Bill Of Materials

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Schematic

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Test Data

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Other Documents

Title Updated Type Size (KB)
TIDA-00475 Gerber 15 Dec 2015 ZIP 386
TIDA-00475 CAD Files 15 Dec 2015 ZIP 2497
TIDA-00475 PCB 15 Dec 2015 PDF 1127
TIDA-00475 Assembly Drawing 15 Dec 2015 PDF 224
TIDA-00475 BOM 15 Dec 2015 PDF 57
TIDA-00475 Schematic and Block Diagram 15 Dec 2015 PDF 568