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CPU RTC / PMIC RTC

Hi,

on the Mistral Centaurus Eval-Kit are 2 RTCs. One inside the processor and one inside the TPS659113. Both are driven by a seperate crystal / oscillator.

For my custom board, is it necessary to use both or can I disconnect the RTC inside the PMIC thru removing the external crystal? My board will be very small, so I have to select which parts are really needed and which can be removed.

Regards,
Thomas