DRV8825 nRESET problem

Jorge Salome

Other Parts Discussed in Thread: DRV8825

Hello,

The problem I am facing while using the DRV8825 Bipolar Stepper Motor Driver, is that the pulse duration that I have set at nRESET, does not reset the chip. I have looked at the data sheet and have not been able to find what is the minimum pulse time that it needs in order to reset. Increasing the pulse does in fact reset it, however, I do not want to just eyeball, or just pick any larger pulse.

I would highly appreciate getting a specific time that the nRESET needs toface in order to complete the reset.

Thank you.

over 11 years ago

0 RE over 11 years ago

TI__Mastermind 20985 points

Jorge, the minimum reset time does appear to be missing from the datasheet. I will check with the designer on the deglitch time. For reference, can you share what time you saw to not work, and the time that does work?

Best regards,
RE

0 Jorge Salome over 11 years ago in reply to RE

Prodigy 40 points

Thanks that would be fantastic, thanks.

Well the time that does not work is about 500 ns, and the time that works, is about 200ms.

Regards,

Jorge Salome

0 RE over 11 years ago in reply to Jorge Salome

TI__Mastermind 20985 points

Ok, nRESET should be taken Low for at least 30µs to overcome the deglitcher.

Best regards,
RE

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DRV8825 nRESET problem