DRV8332: Warning signal

Cherry Zhou

Part Number: DRV8332

The customer encounters following issues during operation: 12-v supply voltage fluctuations and 3.3-v alarm signal fluctuations cause dsp to judge uvp alarms, the following figure is DRV8332 to measure the alarm signal level:

The customer would like to know how to handle it.

Best Regards,
Cherry Zhou

over 2 years ago

+1 Matt Hein over 2 years ago

TI__Mastermind 21805 points

Hello Cherry,

It sounds like you need a bigger bulk capacitor for the DRV8332 bypassing VDD to ANGD and GVDD_X to GND_X.

Please also confirm that the VREG voltage is stable through this event by observing it on an oscilloscope. nOTW and nFAULT pins are internally pulled up to VREG.

Thanks,

Matt

0 Matt Hein over 2 years ago in reply to Matt Hein

TI__Mastermind 21805 points

Hello Cherry,

Do you need any additional help here?

Thanks,

Matt

0 Cherry Zhou over 2 years ago in reply to Matt Hein

TI__Mastermind 22235 points

Hi Matt,

Thanks for your kind reminder. The problem has been solved.

Thanks again!

Best Regards,

Cherry

0 Matt Hein over 2 years ago in reply to Cherry Zhou

TI__Mastermind 21805 points

Thanks Cherry!

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DRV8332: Warning signal