PCF2129 RTC with OM13092

[fatihozen]

Hello,

I have PCF2129T and OM13092 Dev. Board ( LPC54608 ).  I wanna have updated time in my projects and testing this RTC. I chose I2C for communication and added a battery to RTC. But when I cut the power from board and then repower it, RTC datas gone away. It shows strange datas. I changed battery once and still same result. Project in attachment. It seems battery is not working. Battery voltage is 2,941 V now. Any suggestion ?

no battery:

with battery(similar result):

connection is like :

[xiangjun_rong · Accepted solution]

Hi, Fatih,

I suppose that the second/minute/hour/month/year registers lose their value after you power off both the power supply from VDD pin and battery power supply  from Vbat pin, you have to write the initial value to the second/minute/hour/month/year registers after you power on again.

This is LPC micro controller forum, for PCF2129 question, it appear you can post a ticket to the link:

https://community.nxp.com/community/other 

Hope it can help you

BR

Xiangjun Rong

[fatihozen]

Thank you, this solved my problem.