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TPS7B68-Q1: the connection of WD_EN pin

Takao Yamamoto5
Expert 1690 points
Part Number: TPS7B68-Q1

Dear all,

Could you teach me the recommended value of pull down resistor?

We think to use WD_EN as always enable during normal operation, and disable during pre-shipment inspection.

And we think to connect this pin like following picture.

Best regards,

  • 0
    TI__Genius 14245 points
    Hi Takao,

    from the device perspective the value of the pull down resistor will not have much effect the device. Sizing the resistor mostly depends on how much current the supply connected to the test point during pre-shipment inspection can supply while keeping the voltage at WE_EN above the high level threshold voltage of 2V (Vih). If there is any board level leakage current the pulldown resistor should be sized such that the leakage discharged to ground and the voltage does not exceed the the low level threshold voltage of 0.7V (Vil)

    As a general rule you probably want the pull down resistor to to be between 1k-1M.

    -Kyle