lpcware

RTC power consumption

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jurrien on Wed Apr 29 06:52:30 MST 2015
In our new LPC1837 design we use a SuperCap (1.5F) to power the RTC.
Based on experience with our similar design, based on the LPC1767, we would expect the clock to keep running for a couple of (3-4) weeks.
When VDD powered off however, the supercap runs empty (< 1.8V) on our LPC1837 within 1 day.
This happens even without the RTC enabled.
Appearently Ibat is much larger than the 3uA stated in the documentation.
Is there a solution to this problem?

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