DRV8825: About Unused pins

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Guru 21045 points

Part Number: DRV8825

Hi Team,

We don't use nHOME(27pin), nENBL(21pin), nSLEEP(17pin), nRESET(16pin) pins

Therefore, we examine the following setting.

- nSLEEP(17pin), nRESET(16pin) are pulled up to 3.3V or 5.0V directly

-nENBL(21pin) is OPEN (No connected).

-nHOME(27pin) is pulled up to 3.3V or 5.0V by 100kohm

Could you please let us know if you have any concern?

Regards,

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over 4 years ago

0 Pablo Armet over 4 years ago

TI__Mastermind 37683 points

Hello Hide,

Your settings should be able to work but I do want to mention one concern.

The power up sequence needs to happen such that no signals are sent to the STEP input while the power supply voltage has not reached its target value. If the power supply value is too low while sending input signals, the outputs will remain unchanged.

0 Hide over 4 years ago in reply to Pablo Armet

Guru 21045 points

Hi Pablo-san,

Thank you for your prompt reply.

I’d greatly appreciate your verification.

Regards,

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DRV8825: About Unused pins