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3-axis incremental encoder interface with position scaling

The TMC424 is a triple incremental encoder input chip, which interfaces to any SPI compatible controller. The TMC424 can especially be used in conjunction ith the TMC429 triple stepper motor controller to provide position verification or stabilization using some additional software. It integrates 24 bit counters for each encoder to provide a high position resolution without CPU interaction. Further it allows dynamic resolution adaptation to allow direct comparison of encoder counters with motors using different micro step resolution. All encoder counters can be latched synchronously, or whenever a null channel event occurs, providing a position on strobe holding function. The TMC424 the direct successor of the discontinued TMC423.




  • Stepper Motor Position Verification
  • Position Maintenance
  • Incremental Encoder Interface Readout
  • Step / Direction conversion for TMC428 systems


  • Supports 2 and 3 channel incremental encoders with a wide range of resolutions
  • Allows step / direction signal extraction from TMC428 output data stream
  • Programmable pulse shaping for step / direction interface
  • 24 bit integrated position resolution
  • Programmable prescaler for Incremental Encoder Interface
  • 4-times evaluation of encoder signals
  • Fast 32 bit SPI interface
  • Can share SPI interface with TMC428 and supplies separate interrupt output
  • Integrates Reference Switch Multiplexors
  • Package: TQ100

Note: SPI is Trademark of Motorola, Inc



  File Size Modified
TMC424_datasheet.pdf 452.76kB 17-Oct-13


  File Size Modified
TMC424_ShortSpec.pdf 229.17kB 17-Oct-13
TMC424_datasheet.pdf 452.76kB 17-Oct-13