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TPS65381A-Q1: power down Without WR_CAN_STBY

manoj devi
Prodigy 40 points
Part Number: TPS65381A-Q1
Other Parts Discussed in Thread: TPS65381-Q1

Hello,

         Is there any way that we can power down the TPS65381-Q1 without WR_CAN_STBY. Because Am not using any CAN communication in my Project right now.

Thank you .

  • 0
    TI__Genius 10885 points
    Hi Manoj,

    It appears that the IGN pin can power down the device depending on the IGN_PWRL bit.

    Looping in the product expert to confirm.

    Best Regards,
    Rick S.
  • 0 in reply to Richard Solarski
    TI__Mastermind 20590 points

    Hi Majoj,

    There are two wake up pins for the device:  IGN and CANWU. 

    In the simple case, using the IGN pin the device will power up and remain powered while the IGN pin is HIGH and the device will shut off to STANDBY state when the pin goes LOW assuming the supply to VBATx pins remains in the operating voltage range.  Using the IGN_PWRL bit will latch the IGN signal and then the device will remain powered until the MCU clears that bit. If you want the device to power up and down following the supply, then using IGN pin tied to supply is also an option.

    The CANWU pin is latched by default and the device will remain on until the WR_CAN_STBY command is sent assuming the supply voltage remains in operating range. 

    Hopefully that helps, please let us know if you have further questions.

  • 0 in reply to Richard Solarski
    Prodigy 40 points
    Thanks for help Rick s.

    here my requirement is MCU has to set the PMIC in STANDBY mode(means vdd has to 0(no power to MCU)) without CAN communication and Wake-up without CAN communication
    so can you help me with making PMIC STANDBY and WAKE UP .

    Thanks ,
    Manoj.
  • 0 in reply to Scott Monroe
    Prodigy 40 points
    Thanks for help Scott Monroe.

    here my requirement is MCU has to set the PMIC in STANDBY mode(means vdd has to 0(no power to MCU)) without CAN communication and Wake-up without CAN communication
    so can you help me with making PMIC STANDBY and WAKE UP .

    Thanks ,
    Manoj.
  • 0 in reply to manoj devi
    TI__Mastermind 20590 points
    Hi Manoj,

    If you simply want the PMIC to power up the MCU when the supply to the PMIC is given (VBATx pins) then tie IGN to the supply to the PMIC. When the supply ramps it will take IGN high which will power on the PMIC, when the supply is turned off, IGN goes low and input to the PMIC is off so it will power down.

    IGN and CANWU are both wake up pins. IGN is protected to -7V to +40V with a longer deglitch time for noise immunity and is not a latched wake source by default (unless IGN_PWRL is used). So as explained on/off using IGN in default will follow high/low of the pin. CANWU is protected for -0.3V to +40V with a shorter deglitch. This wake source is latched meaning the device will stay on as long as the supply to the device remains until the WR_CAN_STBY is sent. You do not have to use a CAN transceiver to use this wake pin, any compatible wake up signal going low to high will wake up the device and latch the PMIC on until the MCU sends WR_CAN_STBY.

    Hopefully that is now clear.