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pcf85263A fails to upgrade time

Question asked by kumar narendra singh on Nov 16, 2018
Latest reply on Nov 20, 2018 by kumar narendra singh

Hi,

We have developed timer based lubrication system for which we have used PCF85263A RTC chipset.  I am facing one issue that RTC timer normally updates correctly but when time reaches 19:59:00(24hour mode), the next minute, time resets to 00:00:00 instead of 20:00.

if i set time 00:00:00 to 19:59:00, it sets time correctly and RTC updates time correctly up to 19:59:59 but next second, it resets to 00:00:00.

If i set time as 21:00:00, it sets time as 1:00:00, when i set time as 22:00:00, it sets time as 02:00:00, when i set time as 23:00:00 then it sets time as 03:00:00. So my RTC time is not updating more than 20hours.

Can anyone please help me what might be problem? what are registers to be set etc. I need to set 24hour format

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