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Original question:

DRV8818 problem after reset or after sleep.

DRV8818: Solution: Problems with SLEEP

David Walker2
Prodigy 50 points
Part Number: DRV8818

I would have replied to the previous thread, but it was locked.

The problem here is that when you put the DRV8818 to sleep, it resets the part including the electrical position of the drive (the datasheet does not mention this). In order to step properly, the electrical position must be restored. This can easily be done by providing STEP/DIR input while the ENABLE pin is high. Then, when the part is re-enabled, it will have the correct electrical position and should operate properly. 

  • 0
    TI__Guru** 114905 points

    Hi David,

    You are correct. The indexer is reset when the device enters sleep. This will be added in a future datasheet update. 

    Assuming the firmware is tracking the position of the indexer, the electrical position can be restored as you described. Also the step pulses can be sent at a higher than normal frequency since the outputs are disabled.