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TPS65910: The output is not work well.

Lian Wu
Genius 5250 points
Part Number: TPS65910
Other Parts Discussed in Thread: AM3354,

Dears:

Could you kindly help to check the schematic?

Since the output is not work well, and the other information as follows:

输出：PMC_VRTC=1.8V, VAUX2=0.75V, Other LDO is 0V or only 0.6V， VDD_MPU=0V, VDD_CORE=0V, VDDS_DDR=0V

Btw, will the boot method be influence about the PMIC' output?

  • 0
    TI__Genius 10885 points
    Hi Lian,

    VDDIO is an input, how is it being supplied? If PWRHOLD is not high, or PWRON is held low, the PMIC will not boot.

    The boot method and voltages are defined by the BOOT0 and BOOT1 pins, according to section 6.3.2 and 5.22.1 of the datasheet.

    For additional reference, there is also a schematic checklist located here: www.ti.com/.../technicaldocuments

    Best Regards,
    Rick S.
  • 0 in reply to Richard Solarski
    Genius 5250 points

    Hi Rick:

    Thanks for your suggestions.

    And we check the boot and time sequence, and the power has output, however, AM3354 can not boot normally.

    We are checking AM3354's materials, and pls. kindly help to check the power sequence as follows:

    Is it OK?

  • 0 in reply to Lian Wu
    TI__Mastermind 30310 points
    Luck,

    It sounds to me that the device is not in the ACTIVE state. It appears to be in the OFF state waiting to transition to the ACTIVE state, and the PMIC cannot leave the OFF state until a "POWER ON enabled" event occurs. The OFF state is defined as "Off: The main battery supply voltage is high enough to start the power-up sequence but device power on is not enabled. All power supplies are in OFF state except VRTC."


    Please refer to section 5.22.2 Power Control Timing of the TPS65910 datasheet. Figures 5-3, 5-4, and 5-5 all show the behavior of the device relating to the logic state of the PWRON, NRESPWRON, and PWRHOLD pins.