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TPL5111: Driving DELAY/M_DRV PIN with Logic HIGH from a micro-controller instead of push switch

user1609673
Prodigy 10 points
Part Number: TPL5111

Hello,
    I want to connect the DELAY/M_DRV pin directly to a micro controller output to assert the DRVN pin. Is it possible ? It is not clear in the datasheet. In section 6.5 it mentions that LOGIC_HIGH on M_DRV pin is anything above 1.5V, however in section 7.5.2 it says VDD must be applied on DEALY/M_DRV pin to recognize as manual Power ON.

 Please clarify.

Thanks..... Pradeep

  • 0
    TI__Genius 16845 points
    Hi Pradeep,

    Avoid driving the DELAY/M_DRV pin to GND. If the MCU output is open-drain, I don't see an issue with connecting the MCU output directly to the pin. However, if it is a push-pull output, I would recommend to drive a PMOS with the MCU output.

    1.5V is the logic high threshold for M_DRV. Applying VDD is OK.

    Kind regards,
    Lane