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DRV2625: Calibration Routine

K.Yaita
Guru 29710 points
Part Number: DRV2625

Hi Team,

The datasheet shows the following.
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(page 27)
8.6.7 Calibration Routine
The DRV2625 has a calibration routine that automatically populates all critical parameters required for successfully driving a specific actuator (the one connected and being calibrated) in closed-loop. Variation occurs between different actuators even if the actuators are of the same model. To ensure optimal results, TI recommends that the calibration routine be run at least once for each actuator.
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My customer think it is difficult to run calibration routine for each actuators (same model) in manufacturing process.
Is there any concern to use averaged values of output parameter?
For example, calibrate 10 units and using averaged value.

Best Regards,
Yaita

  • +1
    TI__Expert 8832 points

    Hi Yaita, yes, we recommend using >10 actuators spread across a few lots to make sure the settings are optimized. Using auto-calibration for every actuator will achieve constant voltage. When using fixed settings, you may see the voltage vary across transducers because the back-EMF voltage from the actuator may not be consistent. These fixed settings are register 0x21, 0x22, and 0x23 - bits[0-1].