DRV8908-Q1: 'IC_STAT' - Behaviour

Josef Warta

Expert 4310 points

Part Number: DRV8908-Q1

Hello Team, question from customer:

Which root-cause could set all bits of IC_STAT to '1' ?

They can see this event during a short GND floating.

Is there any other root-cause?

Many Thanks

Josef

over 2 years ago

0 Jacob Thompson over 2 years ago

TI__Mastermind 23431 points

Hey Josef,

Our automotive driver expert is out today and will get back to you within 1 business day, thanks!

Just to clarify - do you mean this happens when the GND connection is broken and the GND for the board is just left floating?

Regards,

Jacob

0 Shinya Morita over 2 years ago in reply to Jacob Thompson

TI__Mastermind 45075 points

Hi Josef,

Thank you for your question.

I assume IC_STAT=1 means 1b. So IC_STAT =1b (0000,0001) means NPOR=1

This situation could happens by CLR_FLT command. I guess customer send CLR_FLT command before detecting NPOR=1.

regards

Shinya Morita

0 Josef Warta over 2 years ago in reply to Shinya Morita

TI__Expert 4310 points

Hello Shinya, customer see all flags/bits as 1 means (0111 1111). BR Josef

0 Shinya Morita over 2 years ago in reply to Josef Warta

TI__Mastermind 45075 points

Hi Josef,

It is difficult to believe all fault flags are 1. Sometimes we see all 1 or 0 during SPI communication error- I am not talking about DRV8908-Q1, but more generic GUI, MCU, evaluation tool communication error.

You commented "GND floating", so something wired situation is happening on SPI related I guess.

regards

Shinya Morita

Motor drivers

Motor drivers forum

DRV8908-Q1: 'IC_STAT' - Behaviour