DRV8711: Using V5 to drive a microcontroller

Mattia Dell'Oca

Part Number: DRV8711

Dear All,

I'm a newbie of motor drivers. I want to use the DRV8711 and a microcontroller which is supplied by V5 (pin 6 of DRV8711).

The sleep pin is kept alway high by a 5V zener (not connected to the micro) but the RESET PIN (pin 9) is controlled directly by the micro.

Normally the micro keeps the reset line low (no reset) but I saw that the micro, at the startup puts the line high for 3ms.

Does the reset command interrupt also the V5 voltage? Which is the minimun time accepted from DRV8711 for resetting?

Best Regards,

Mattia

over 5 years ago

0 James Lockridge19 over 5 years ago

TI__Genius 14485 points

Hello Mattia,

I will need to check with our design team.

0 James Lockridge19 over 5 years ago in reply to James Lockridge19

TI__Genius 14485 points

Mattia,

The V5 regulator should not be disabled in reset mode.

0 Mattia Dell'Oca over 5 years ago in reply to James Lockridge19

Prodigy 235 points

Hi James,

thank you for your answer.

So do you think that I could drive the reset pin with a microcontrolled which is supplied by V5 regulator?

Thank you very much,

Mattia

0 James Lockridge19 over 5 years ago in reply to Mattia Dell'Oca

TI__Genius 14485 points

Hello Mattia,

Yes, I think that should be fine. You can double check you V5 rail voltage on a scope when you run the condition to be sure it still supplies the MCU.

0 Mattia Dell'Oca over 5 years ago in reply to James Lockridge19

Prodigy 235 points

Hello James,

thank you very much.
At the moment I can't test it because I've not already produced my PCB. That's why I'm asking it.

Best Regards,

Mattia

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DRV8711: Using V5 to drive a microcontroller