DRV8818

Hi Eli,

What exactly are you trying to check when you say "driver is OK"? Are you looking for a motor stall, over heating, over current, etc?

When the DRV8818 goes into TSD or UVLO proection it resets the indexer to the home position. This could possibly give a false indication, but it all depends how you are interpreting the signal.

Hi eli,

Monitoring HOMEn does provide limited feedback that the indexer state machine is where you expect it, and that state can be offset from an over-current, over-temperature, or under-voltage event.  However, this alone doesn't tell you with certainty that everything is functioning normally.

Best regards,
RE

Hello,

1. Is the indexer is rested to the home state at over - current condition? Is it true?

2. What is the best way to get indication about faults?

Regards

Ran

Hi Ran,

1. I am looking into this.

2. What kind of faults are you looking for?

1. Yes, the indexer will reset to the home state in the case of an OCP event

Hi and thanks for the information.

For faults for example, just reading permanently HOME and as it goes “low” indicate that there is a fault of LV, TEMP or OC?

Thanks,

Ran

Hi, I wanted to add an additional question:

Checking that voltages at AOUT1 with respect to AOUT2 and BOUT1 with respect to BOUT2 follow the sequence according to input step and direction (at full step mode using 4 steps) can be used as a test that the part is OK?

Thanks,

Ran

Hi Ran,

That is probably your best bet. If you can ensure that the HOME pin is in sequence with the stepping of the DRV8818 then the device is OK. In the case of a FAULT, you should see the indexer move to the HOME position and hold.