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DRV8846: Using multiple devices

Michael Brantley
Intellectual 1535 points

Part Number: DRV8846

Hello,

For using 2x DRC8846 devices:

1. Can we tie nENBL low and only use nSLEEP to enable/disable?

2. Can we share tri-state pins between between the two DRVs? I.e. tie the two I0 pins together. Will there be any race conditions as each device exits sleep?

3. How sensitive are the tri-state pins to noise, e.g. during HiZ state?  Do you foresee any issues with adding small capacitance to help filter the noise?

 

Thanks,

Michael

  • 0
    TI__Guru** 114905 points
    Hi Michael,


    1. Can we tie nENBL low and only use nSLEEP to enable/disable?

    Yes, there is no issue with this.


    2. Can we share tri-state pins between between the two DRVs? I.e. tie the two I0 pins together. Will there be any race conditions as each device exits sleep?

    Yes you can do this.


    3. How sensitive are the tri-state pins to noise, e.g. during HiZ state? Do you foresee any issues with adding small capacitance to help filter the noise?

    The pins are generally not sensitive to noise, but can be affected by PCB routing. Having a footprint for a small filter cap is a safe choice if you have the space.