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Hello, I am using a Pmod Grove RTC with a PYNQ board, and it seems to be operating normally when it is powered directly from the 3.3 V of the board. However, when I plug in the backup battery (3.0 V CR1225) into the grove RTC and have it also connected to the board, I can not read or write to the clock. It seems the backup battery somehow disables the device. After reading the page 3 of datasheet of the DS1307 chip, I noticed something weird: "DC power is provided to the device on these pins. VCC is the +5V input. When 5V is applied within normal limits, the device is fully accessible an