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 ?
connection is like :