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Problem with RTC

Tuesday, November 03 2015, 09:01 AM
Heorhiy
Heorhiy
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I have a few boards igepv5 and every time when I unplug the power RTC is reset and they have time "Sat Jan 1 01:00:00 CET 2000". I measured voltage on accumulators and seems it not charged and the value around 1 volt. Is it a hardware defect? Or have to solve it?

Thank you!
Responses (5)
  • Accepted Answer

    abenete
    abenete
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    Tuesday, November 03 2015, 03:15 PM - #permalink
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    Hi Heorhiy,

    the cap's voltage is under the limit for the RTC to preserve time, leave it charging until it reaches its nominal value of 3.1V.
    If it doesn't charge, the battery is dead, so you should replace it.

    Cheers,
    Alejandro
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  • Accepted Answer

    Heorhiy
    Heorhiy
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    Tuesday, November 03 2015, 03:37 PM - #permalink
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    Hi Alejandro,

    RTC did not work from the beginning, seems that you provided boards with the old batteries.
    I measured the voltage at the time when board connected to power supply and disconnected the same votage (bellow 3V) - it does not charge it?

    Shall I send them back as warranty case?
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  • Accepted Answer

    Wednesday, November 04 2015, 08:05 AM - #permalink
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  • Accepted Answer

    Heorhiy
    Heorhiy
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    Wednesday, November 04 2015, 09:01 AM - #permalink
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    I have one spare board for the customer replacement/support and I measured voltage of battery charger with and without power supply - the same 2.76 V so is definitely not charging the battery. ((((
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  • Accepted Answer

    abenete
    abenete
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    Friday, November 06 2015, 11:26 AM - #permalink
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    Hi!

    Backup battery charging is disabled by default. You can enable it by changing a pmic's register; I attach what I have done.

    You can also check if batteries are dead or just depleted. However, this will only work while the board remains powered. If you want a definitive solution, you will have to modify the dts in order to configure this behaviour on boot, like Linux-SWAT pointed out before. I have not tested that solution yet, though.


    Cheers,

    Alejandro
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