johan malfait

RTC in the iMX537 problem by battery backup

Discussion created by johan malfait on Jul 11, 2012
Latest reply on Jan 9, 2013 by Mark Roy

Hi all,

we developed a custom board with the iMX537 and the PMIC MC34708 chip.

On the PMIC, there is a coin cell connected (3V CR2032) on the LICELL pin.

If we program the RTC on the CPU, the RTC runs perfect until we cut the power, afterwards, all the RTC registers are reset.

We have tried the same on a (changed) QSBoard and have the same behavior.

While the power is cut, the voltage VSRTS drops from 1.3V to 1.23V and the 32Khz clock keeps running.


Is there anbody who has already successfull used the iMX537 RTC function, so yes can you give me any sugestion where to look for ?


Best regards