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AM3352 and TPS65910A31 interface and EXT_wakeup generation

Other Parts Discussed in Thread: AM3352, TPS65910A

Hello Biser,

We are designing a portable device for which we have  selected TPS65910A31  PMIC for AM3352  so that VDDS_RTC can be directly sourced from VRTC of the PMIC. I have connected a 3.1V Coin battery to VBACKUP of PMIC and also have connected  INT1 and SLEEP of PMIC to the processor.. I have few queries regarding the RTC only mode and wake up signal generation.

1. Our application uses the RTC functionality and requires RTC-only mode hence according to TRM 8.1.4.3.6  the EXT_WAKEUP0 should be connected to a wakeup source. Can I connect a switch to PWRON pin of PMIC and use it to trigger wakeup. If so then which pin of PMIC should be connected to EXT_WAKEUP pin of the processor. (I Can't use WOL)

2. If the main supply is not there then  both the  Processor and the PMIC will be OFF, in this condition will the RTC  be running in the processor, as we have connected battery to the PMIC. Our poratble device rely on processor RTC for DAY/MONTH/YEAR and HOUR/MINUTE/SECONDS information.

kindly guide me.