DRV8846 using Vint for configuration

Allen Stuart

Other Parts Discussed in Thread: DRV8846

Hi All,

Does anyone know if there is an issue with using the Vint to configure ADEC, Sleep and Vref? I have the device set such that source to VM is controlled and as soon as power is applied the ENBL line is pulled low, and Sleep is pulled high. However the device doesn't seem to function, there is clearly supply to the device but Vint remains off.

Any help would be greatly appreciated.

Kind regards

Allen

over 10 years ago

0 Rick Duncan over 10 years ago

TI__Guru** 114905 points

Hi Allen,

VINT is disabled when the DRV8846 is in sleep mode. When power is applied, the SLEEP pin is seen as a logic 0 and the device remains in sleep mode with VINT disabled.

It is recommended to use an externally supplied voltage to awaken the device.

Tying ENABLE and SLEEP together, or controlling them separately will work.

0 Allen Stuart over 10 years ago in reply to Rick Duncan

Prodigy 240 points

Hi Rick,

Now you've pointed that out it seems obvious...

Surely though tying nsleep and nenable together wouldn't work?

Doesn't sleep have to be high and enable have to be low?

Many thanks,

Allen

0 Rick Duncan over 10 years ago in reply to Allen Stuart

TI__Guru** 114905 points

Hi Allen,

You are correct. nSLEEP must be high and nENBL low for the device to work.

Thanks.

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DRV8846 using Vint for configuration