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AM3352: Power to RTC when not used

Jim Kulyk
Prodigy 215 points

Part Number: AM3352
Other Parts Discussed in Thread: TPS65910,

We are not going to use the RTC functionality on the AM3352 but instead we will be using the RTC on the TPS65910. Is it ok to leave the RTC power pin disconnected on the AM3352 (no power applied to VDDS_RTC) or will this cause other issues with the operation of the AM3352?

Thanks,

Jim

  • 0
    TI__Guru 64835 points

    The two RTC power rails should be powered even if the RTC is not used.

    You can source only VDDS_RTC with the internal LDO enabled (RTC_KALDO_ENn = low), or you can source both VDDS_RTC and CAP_VDD_RTC with the internal LDO disabled (RTC_KALDO_ENn = high).

    These supply rails can be ramped independent of other power supplies if PMIC_POWER_EN functionality is not required.

    Regards,
    Paul