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PCF2129T Battery Issue

Question asked by Fatih ozen on Jul 14, 2020
Latest reply on Jul 15, 2020 by G.w. Sun

Hi,

 

I have a custom board, need a date and time datas so I am using PCF2129T with I2C communication. I am using 3.3V CR2032 cells. The problem is that, when I plug a cell lower than 3.3V, system is ok, working properly but if cell's voltage is over 3.3V all datas are being zero, all registers become 0. What could be the problem ?  You can see the schematic below, +VBAT is connected to VBAT pin of LPC54608. 

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Tried it two different modes, results same:

000  : battery switch-over function is enabled in standard mode; battery low detection function is enabled

011  : battery switch-over function is enabled in direct switching mode; battery low detection function is enabled

)

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