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DRV8308: In case of VM=0V, SDATA, FGOUT, FAULTn, LOCK and Reset are connect to VCC with pull up resistor

Hirotaka Matsumoto
Guru 27585 points
Part Number: DRV8308


Hi all

Would you mind if we ask DRV8308?

In case of VM=0V, SDATA,  FGOUT, FAULTn, LOCK and Reset are connect to VCC=3.3V with pull up resistor as follows;

<Pull-up resistor>
SDATA : 33K
FGOUT : 33K
FAULTn : 33k
LOCK : 33K
RESET : 2.2K

Absolute maximum ratings of SDATA,  FGOUT, FAULTn, LOCK and Reset are -0,5V to 5.75V.
Therefore, it is no problem, right?
Just in case, their pins don't have diodes to Vcc, right? 

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    Three is no problem with the pins connected through pullup resistors to 3.3V and VM=0.

    We will confirm the inputs structures. A reply should be available by Friday.
  • 0 in reply to Rick Duncan
    Guru 27585 points

    Rick san

    Thank you for your prompt reply.

    We will confirm the inputs structures. A reply should be available by Friday.
    ->OK, thanks.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    Sorry for the delay.

    Our design team has been unavailable to answer the question. The new target date is Oct 18th.
  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    -----------------------------------------------------------------------------------------------------------------------------------------------------------

    In case of VM=0V, SDATA, FGOUT, FAULTn, LOCK and Reset are connect to VCC=3.3V with pull up resistor as follows;

    <Pull-up resistor>
    SDATA : 33K
    FGOUT : 33K
    FAULTn : 33k
    LOCK : 33K
    RESET : 2.2K

    Absolute maximum ratings of SDATA, FGOUT, FAULTn, LOCK and Reset are -0,5V to 5.75V.
    Therefore, it is no problem, right?
    Just in case, their pins don't have diodes to Vcc, right?

    -------------------------------------------------------------------------------------------------------------------------------------------------------------

    There is no problem.

    There will be current flow through the internal pulldown resistors (RESET and SDATAI) to GND.

    The pins do not have diodes to internal regulators.