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TIDA-00642 Foot controller Using Analog Hall Sensor 

 
 

 

Design Overview 

TIDA-00642 uses analog Hall Sensor DRV5053 
and OpAmp LMV612 to achieve a foot controller 

circuit with approximate linear response and 
adjustable quiescent offset and the full scale 
output range. 
 

Design Resources 

TIDA-00642

  Design Folder 

DRV5053

 

Product Folder 

LMV612

 

Product Folder 

OpAmp Application Guide

 

 

 

Design Features 

  Approximate linear response of the 

position to output voltage 

  Adapt with wide magnet types and range 

of flux density 

  0 to 5V full scale output ability 

  Adjustable quiescent offset voltage at 

zero magnet field 

  Adjustable wide range system sensitivity 

  Low power RRIO amplifier stage 

  Cost effective 

 

Featured Applications 

  Foot controller 

  Industrial control stick 

  Industrial foot pedal 

  Key stroke monitor 

  General position or angular sensing 

 

 

 

 

1. Introduction 

Analog Hall sensor can be used as position or angular sensing with the benefits of no contact and 
wearing, high stability and repeat positioning accuracy and wide sensibility range. There are normally 
two major methods of the configuration of the magnet and the Hall senor, non-linear and linear way. 

This design gives introduction of the two methods and focuses on the linear configuration, and gives 
OpAmp circuit design to achieve wide adaption to different applications. 
 

Summary of Contents for TIDA-00642

Page 1: ...uiescent offset voltage at zero magnet field Adjustable wide range system sensitivity Low power RRIO amplifier stage Cost effective Featured Applications Foot controller Industrial control stick Industrial foot pedal Key stroke monitor General position or angular sensing 1 Introduction Analog Hall sensor can be used as position or angular sensing with the benefits of no contact and wearing high st...

Page 2: ...e In linear configuration the Hall sensor is placed at the mid position of the magnet as the quiescent position no perpendicular flux through the Hall sensor When the magnet departs from the quiescent position the output can change two way up or down depending on the moving direction With the help of OpAmp stage both the two configurations can output 0 to 5V continual analog signal Please refer to...

Page 3: ...with the quiescent 1V at zero field or no perpendicular flux to the sensing surface In non linear configuration the output range is limited either from 0 2V to 1V or from 1V to 1 8V An OpAmp stage is introduced in this design It deals with the raw Hall sensor output signal with adjustable offset and scaling range shown in Figure 3 Figure 3 OpAmp stage ...

Page 4: ...d offset point back to step 1 readjustment the offset point 4 Back to step 2 to readjustment the offset output 5 Repeat 1 to 4 steps to get both the designed offset the scaled output range 6 Note that the adjustment range of offset and scaling is also related to the mechanical magnet configuration and the magnetic field Do possible adjustment of the mechanical configuration if needed 7 The OpAmp p...

Page 5: ... application requires the output stay at about 1 1V when the actuator is at the balanced point fixed offset point When the foot strokes downside the output goes from 1 1V down to 0V When the foot strokes upside the output goes from 1 1V up to 5V VCC This 0 to 5V analog signal will output to the sewing machine control unit and be taken as the speed commands of the spindle Below figure shows the out...

Page 6: ...TIDA 00642 Foot controller Using Analog Hall Sensor 6 b Down stoke Figure 5 Output test data example ...

Page 7: ...iconductor products are sold subject to TI s terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its components to the specifications applicable at the time of sale in accordance with the warranty in TI s terms and conditions of sale of semiconductor products Testing and other quality control techniques for TI components are used to the extent TI de...

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