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ATSAMC20 - OSCULP32K power consuption (Ultra Low Power Internal 32kHz RC Oscillator)

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MaxMn
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2019/10/16 02:48:56 (permalink)
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ATSAMC20 - OSCULP32K power consuption (Ultra Low Power Internal 32kHz RC Oscillator)

I am looking for the typical power consumption of the OSCULP32K (Ultra Low Power Internal 32kHz RC Oscillator) of ATSAMC20J18A.
  • In the device family datasheet DS60001479C, I can't find it in chapter 45.12.5. Any hints where to look for it?
  • Is AN2633 "Precise, Ultra-Low-Power Timing using Periodic Enabling of the 32.768 kHz External Crystal Oscillator for Recalibration of the ULP Internal Oscillator" applicable in principle (register names aside) to SAM C20, too?
Background: I'm migrating an AVR project to SAM C20. The former uses Maxim Dallas DS1337 RTC. Typical timekeeping current is 425nA. So my plan for SAM C20 is
  • have a 32768Hz crystal on XIN32/XOUT32 (XOSC32K)
  • generate an UART-friendly frequency with FDPLL96M from XOSC32K
  • clock RTC from OSCULP32K when on battery
  • wake up periodically, say once a minute, turn on XOSC32K (External 32 kHz Crystal Oscillator) and calibrate OSCULP32K via OSCULP32K.CALIB
 
 
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