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TPS65910A3EVM-583: Issue of PMIC Output

Part Number: TPS65910A3EVM-583
Other Parts Discussed in Thread: TPS65910

In AM335X EVM Board without booting the processor we are getting  PMIC Output VDIG1=1.8V, VMMC=2.45V . The same PMIC is used in my customized board where i am getting VDIG1=2.4V, VMMC=3.3V. Is these variations causes any problem in booting the processor in my customized board? How  we  can correct the above voltages in my customized board?

  • Vamsi Siddhani,

    The procedure for BOOT and the output voltages depend on the state of the BOOT1 and BOOT0 pins when power is first applied.

    When BOOT1 = 0b and BOOT1 = 0b, all TPS65910xx devices boot according to the TPS65910 datasheet documentation starting on page 35.
    When BOOT1 = 0b and BOOT0 = 1b, all TPS65910xx devices boot according to the TPS65910 datasheet documentation starting on page 38.


    VMMC will be 3.3V when BOOT[1..0] = 00b
    I do not see any case where VDIG1 or VDIG2 should be 2.4V, but this could be due to a leakage path through the AM335x processor resulting from improper sequencing using the wrong BOOT method.

    When BOOT1 = 1b and BOOT0 = 1b, the TPS65910xx device will boot using the OTP values programmed specifically for the application. In your case, the TPS65910A3 will boot correctly for the AM335x. To ensure BOOT1 and BOOT0 pins are high early enough, they should be tied directly to VRTC which turns on as soon as a valid power supply is applied to VDD7.

    Thanks & Best Regards,

    Brian