DRV8800: nFault at nsleep

Yusuke Mukuno

Part Number: DRV8800

HI Expert,

Could you please let me know the nFault pin condision at nSleep.　（Vbb : keep 24V)

The datasheet described, the nFault will be disable at Sleep mode. Is it meaning, will the nFault pin be high-Z? or Indefinite state?

Thanks

Muk

over 3 years ago

0 Pedro Arango Ramirez over 3 years ago

TI__Expert 4970 points

Hi Mukuno san,

I will be happy to help you out today!

You are correct, when the device is set to sleep nFault is no longer considered a valid output. Therefore the best way to approach the problem would be to consider it an indefinite state, it will not be able to convey useful information.

Section of the datasheet:

Best,

Pedro Arango Ramirez.

0 Yusuke Mukuno over 3 years ago in reply to Pedro Arango Ramirez

TI__Expert 7395 points

Pedro-san,

Additional info,

They would like to 2pcs DRV8800. and they plan to use Wired OR for nFault of each devices.

Therefore, they would like to be High-Z at sleep mode.

Your comment is meaning, It is an indefinite state at sleep mode. Is it correct?

If yes, they have to re-consider thier configulaton.

Thanks

Muk

0 Pedro Arango Ramirez over 3 years ago in reply to Yusuke Mukuno

TI__Expert 4970 points

Mukuno san,

Yes, the device will be in an indefinite state during sleep mode. However I dug around and found the following thread regarding a similar issue. Rick Duncan provided a response that could be useful to your customer's case:

Link to thread: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/400121/drv8800-short-nfault-output-at-the-edge-of-nsleep

Best,

Pedro Arango Ramirez.

Motor drivers

Motor drivers forum

DRV8800: nFault at nsleep