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How to detect if VBAT supply is present for RTC to work?

Question asked by Amit Kumar on Aug 20, 2014
Latest reply on Sep 9, 2014 by Amit Kumar


I am using K60 custom made board with cw10.6. In my application I have to time stamp the data. for that I am using RTC. If VBAT pin is given a supply of 3.6V through a coin cell and then the program is dumped, my code is works fine . Suppose my battery is dead, my programs hangs and keeps restarting. Is there any way to find out if VBAT supply is present?

During Initialization I want to check if VBAT supply is present only then I will initiate the RTC else I will use some other clk source i.e from different uc. I also wanted to know what will happen if  VBAT pin is left open? Will my entire program hang or will the rest of the program work excluding RTC?  I will be using PE component for RTC.


Kind Regards

Amit Kumar