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TPL5110-Q1: M_DRV_DOH related questions

Henry Chan
Prodigy 450 points
Part Number: TPL5110-Q1

Hi Team,

Customer have a few question for TPL5110-Q1

1. If only timing wake-up feature is used, Are they supposed to pull down corresponding  voltage on DELAY/M_DRV PIN pin?

2. In the early stage of design, customer wanted to use MCU to control M_DRV_DOH and designed as per datasheet to control MOS.

But in the end they do not want to use this feature, so customer would like to know if it is possible to cancel/remove M_DRV_DOH signal.

3. In datasheet it mentioned that DELAY/M_DRV is briefly pulled VDD, what is the purpose/function of manually turning on the MOS? 

To reset counter? if this is the case then is it the same as controlling VDD to disconnect RST_TIMER_DOH?

Thanks

  • 0
    TI__Guru* 85130 points

    Hi Henry,

    What is _DOH?

    DELAY/M_DRV pin needs a pull down resistor to set the time interval, you cannot pull this pin to ground.

    If we keep DELAY/M_DRV pin high, then DRV will stay at low until DELAY/M_DRV pin is released.

    If we briefly pull this pin to high, DRV cycle will be interrupted, new cycle will start again after some delay. (Figure 7-4 in the datasheet)

  • 0 in reply to Noel Fung
    TI__Prodigy 450 points

    Hi Noel,

    Thanks for the clarification.

    Sorry I failed to attach schematic last time.

    For DOH please see below, where customer pull DOH high to disconnect power supply, and use this to reset counter

  • +1 in reply to Henry Chan
    TI__Guru* 85130 points

    Hi Henry,

    You can use M_DRV_DOH to reset the counter. 

    During resistor reading period, the current consumption will be a few hundreds of µA, there will be some voltage drop at R418, this is not a very good design. If you really want to have the option of power supply control, your switch should be placed at VBAT_5V.

    Also suggest put a pull-down resistor at DONE pin. D39 made this pin floating.

  • 0 in reply to Noel Fung
    TI__Prodigy 450 points

    Got it

    thanks you