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The operation of pin to pin short conditon for TPS7A6333-Q1

Atsushi Yamauchi
Genius 4810 points

I would like to confirm the operation of the short 5 & 6 pin and 9 & 10 pin for TPS7A6333-Q1.

About 5(EN) & 6(RDELAY) pin, I think it is normal operation 7V > 5pin, but I don't understand the operation keeping "high" at RDELAY pin.

About 9(WD_FLT) & 10(WD) pin, it could not WD operation but I don't understand the operation in detail.

Could you please teach them?

Best regards,

Atsushi Yamauchi 

  • 0
    TI__Mastermind 27780 points
    The appropriate Applications Engineer has been assigned to respond accordingly. Thank you for your patience.
  • 0
    TI__Expert 5675 points
    Hi Yamauchi san,

    May I know why would you short these pins? Does customer use it like this?

    Pin 5(EN) is an input pin, Pin 6(RDELAY) is an output pin. Pin 9(WD_FLT) is output pin, Pin 10(WD) is input pin.

    I am sorry I cannot find any description "the operation keeping "high" at RDELAY pin", do you mean nRST pin? If yes, nRST is an open-drain reset output pin with an external pullup resistor connected to the VOUT pin. It will be pulled high after the delay time set by the capacitor connected to RDELAy pin during the normal power up sequence.

    For the WD_FLT, please refer to the datasheet page 15, "Watchdog Fault Outputs" section.

    Best regards,
    Jason Liu
  • 0 in reply to Jason. Liu
    Genius 4810 points
    Dear Jason-san,

    Thank you for your reply.

    The aim is the short check and they does not use these conditions (like FMEA).

    In the case of Pin 5 and 6, RDELAY pin has VIN voltage. RDELAY pin is "output" pin and decides the delay time by this voltage and the resister, so I think Vin voltage impacts delay time because the voltage is different (especially Vin > RDELAY voltage made at the inside of IC).

    How does VIN voltage (short RDELAY pin) impact the delay time?

    Best regards,
    Atsushi Yamauchi
  • 0 in reply to Atsushi Yamauchi
    TI__Expert 5675 points
    Hi Yamauchi san,

    Do you mean customer want to short the RDELAY pin to VIN? Please be careful that, the maximum voltage of RDELAY pin is only 7V. Beyond this voltage, device may be destroyed.

    During normal operation, when the output voltage VOUT below one certain voltage level, nRST keeps low; after VOUT achieve the certain level, RDELAY starts to charge up, nRST turns high after the short delay.

    If the RDELAY is short to VIN and pulled high already, nRST turn high without the delay time.

    Best regards,
    Jason Liu