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Original question:

DRV8876: Provision for BEMF

DRV8876: When VM = 0V - Current Draw and Pin Voltage Tolerances

ReedKacz
Intellectual 2540 points
Part Number: DRV8876

Hi Team,

I have an application where to enter lower power mode of my system, I disconnect VM and set it to 0V.

When I do this - I do not expect any current draw from the device except for leakage paths through the internal pull downs on nSleep, In1, and In2. Is that correct?

When VM =0V, I will have PMODE = 3.3V, IMODE = 0V, IPROPI =0V, and VREF = 3.3V. Will this damage the device? I believe it will not since the ABS MAX table shows these pins able to handle 5.75V independent of the supply. But I wanted to double check.

Thanks!
Reed

  • 0
    TI__Expert 8980 points

    Hi Reed,

    See answers inline.

    I disconnect VM and set it to 0V. When I do this - I do not expect any current draw from the device except for leakage paths through the internal pull downs on nSleep, In1, and In2. Is that correct?

    -> Also: VM current = 0.75 uA and when PMODE = 3.3 V, PMODE current = (3.3 V / 5. 0V ) * 113 uA = 74.58 uA.

    When VM =0V, I will have PMODE = 3.3V, IMODE = 0V, IPROPI =0V, and VREF = 3.3V. Will this damage the device? 

    -> No, it should not damage the device.Typically, we recommend the system to have the inputs to a logic low to reduce current consumption.