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PMIC TPS65910 using to switch off my system power

lofna kumari
Expert 2785 points
Other Parts Discussed in Thread: TPS65910

Hi,

I am using TPS65910 PMIC in AM335x Processor. How to switch off the power using PMIC.

I have tried system command in Linux using below command is rebooting/Resetting the device.

i2cset -f -y 0 0x2d 0x3F 0xFF (reset my device.)

Is there any registers to switch off the power supplies. so that i can shutdown my system.

Thanks,

Lofna

  • 0
    TI__Genius 10885 points

    Hi Lofna,

    0x3F is the correct register, but the relevant bits are either DEV_OFF or DEV_OFF_RST, shown in the logic diagram (top right corner) in Figure 6-1 of the TPS65910 datasheet.

    DEV_OFF_RST has the capability of clearing the DEV_ON bit, which DEV_OFF cannot do, so the device will reboot if DEV_ON is set and DEV_OFF is used.

    The device may reboot if PWRHOLD is still active after shutdown, as this will appear as a valid start condition.

    If PWRHOLD is held with a regulator that can be turned off, disabling that regulator should shut down the TPS65910 device.

  • 0 in reply to Richard Solarski
    Expert 2785 points

    Hi Richard,

    Thanks for your response. 

    I tried in all the commands but my system is rebooting. what all the registers i can set and stop my device.

    i2cset -f -y 0 0x2d 0x3F 0x61 (Reboot) 

    i2cset -f -y 0 0x2d 0x3F 0x63 (reboot) 

    i2cset -f -y 0 0x2d 0x3F 0x68 (Reboot)

    i2cset -f -y 0 0x2d 0x3F 0x6B(Reboot)

    Any combination using 3F register i am getting rebooting. How to switch off the device could you send any poweroff command it is good.

    Regards,

    Lofna

  • 0 in reply to lofna kumari
    TI__Genius 10885 points

    Hi Lofna,

    If the PWRHOLD pin is still asserted, the device will start back up after a software shutdown instruction has completed.. Can you monitor/control the input to PWRHOLD?