uTasker
Member Since: March 20, 2015
Country: Switzerland
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To use the RTC it is best to add a very low power 32kHz oscillator connected to the RTC input pin. Keep the complete circuit powered from a battery and use its low leakage mode to reduce the power to the 1..2uA range. To wake up, a low leakage wakeup (LLWU) input can be used or even an alarm configured in the RTC itself. It is also possible to use the RTC without any crystal by clocking it from the internal LPO (1kHz RC oscillator). This clock continues in the low leakage modes so can also maintain time as in the case discussed previously. It will however have a larger drift than a crystal or external oscillator. More info at http://www.utasker.com/kinetis/KL_RTC.html and http://www.utasker.com/kinetis/LLWU.html There is also a "Teensy LC" simulator at http://www.utasker.com/kinetis/TEENSY_LC.html
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