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TPL5110: Delay Pin Conundrum

Part Number: TPL5110

Hi Guys,

I am trying to use a GPIO pin to keep the TPL5110 from resetting, similar to the switch shown in the schematic in your datasheet (and similar to this user's idea, which is based on the datasheet: https://e2e.ti.com/support/clock-and-timing/f/48/p/670322/2468634#2468634?jktype=e2e I am using a PMOS transistor, as you guys suggested. I have run into an issue though. Since the DELAY pin is only sampled at the beginning of the timing period, it doesn't get sampled in time for the GPIO pin switch on the transistor to connect DELAY to VDD. The trick is, I suppose, I am trying to use the device the TPL5110 is powering to control the TPL5110 to tell it not to reset (or to go back to normal timing cycle). Can you think of a work-around or any other way to achieve this?

Best,
Casey

  • Hi Casey,

    Unfortunately, I can't think of a simple way to prevent reset using the device you are powering, as it would need a way to turn itself back on to reset the timer. You would need another way to control the DELAY pin.

    Kind regards,
    Lane