Automotive Brushed-Motor Ripple Counter Reference Design for Sensorless Position Measurement
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Key Document


The demand to retain memory on the position of the seat, window, sliding door, mirror, lift-gate, and others driven by that motor has increased as small motors within the modern automotive vehicle continue to evolve. Existing solutions utilize multiple magnetic sensors attached to the body of a motor to provide a feedback loop to the motor control module. A sensorless approach provides redundancy for existing solutions and, in some cases, removes the requirement for motors with sensors attached. The sensorless approach has become increasingly popular through the implementation of an in-line, current-sense signal-conditioning circuit. This reference design provides a solution that is easily modifiable for many automotive motor systems that control position measurement.

  • Configurable for many DC motor solutions
  • -14V to 80V wide common mode input range for in-line motor current sensing
  • Operational for typical 9V to 18V battery supply
  • Simple interfacing with MSP430™ LaunchPad™ Development Kit for digital capture

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA240-Q1  AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMV7275-Q1  Automotive, low power comparator with rail-to-rail input  Amplifiers  Sample & Buy Not Available
TLV2316-Q1  AEC-Q100, 2-Channel, 10-MHz, RRIO, low-noise, low-voltage, 1.8-V CMOS op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS7B69-Q1  Automotive 150-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA240-Q1 Download
Download Download
LMV7275-Q1 Download Download
TLV2316-Q1 Download
TPS7B69-Q1 Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 5848 14 Jun 2018
Design files (6)
Title Type Size (KB) Date
PDF 205 17 May 2018
ZIP 619 17 May 2018
PDF 67 17 May 2018
ZIP 356 30 Jun 2017
PDF 624 30 Jun 2017
PDF 113 30 Jun 2017
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Automotive 2-Axis Power Seat Brushed DC Motor Drive Reference Design  TIDA-01330  Reference design 

Hardware development (1)

Name Part Number Tool Type
MSP430FR6989 LaunchPad Development Kit  MSP-EXP430FR6989  Development kit 

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