rtc time faster ?

[vitthal muddapur]

Posted on February 23, 2018 at 14:49

hi,

I have set internal clock frequency 1Hz but RTC time is faster than the real time

I have stm32l0 rtc clock LSI with 37khzPREDIV_A=125 andPREDIV_S =296

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[Tesla DeLorean]

Posted on February 23, 2018 at 14:58

Product isn't 37000 is it?

You should perhaps also quantify LSI via MCO pin

[vitthal muddapur]

Posted on February 23, 2018 at 15:08

[vitthal muddapur]

Posted on February 23, 2018 at 15:09

above image RTC Clock is 37khz

[T J]

Posted on February 26, 2018 at 07:37

Let me suggest that you wouldn't depend on the accuracy of the processor RTC.

if you want to know the time of day accurately, I would suggest something like DS3232. with a temperature compensated embedded crystal.

http://datasheets.maximintegrated.com/en/ds/DS3232.pdf

 

also good for Storage of 256bytes of external R/W data

[vitthal muddapur]

Posted on February 26, 2018 at 09:25

hi,

how to solve this problem without external RTC