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C5505/5515 RTC only mode

Hi,

Can I use RTC circuit to wake up DSP from RTC only mode? Specifically, can I use RTC to generate a alarm signal on the WAKEUP pin to enable the DC-DC, which provide the power supply (CVDD and DVDD) to DSP?

From the Datasheet, it states "A high pulse for a minimum of one RTC clock period (30.5 μs) to the WAKEUP pin is required to wake up the device from the RTC only mode", does it mean I have to configure the WAKEUP pin as input and in turn I can not use RTC to generate a pulse on the WAKEUP pin to enable external PMIC?

Thanks

A shen