The most likely problem is an issue with the battery (most likely with the series resistors that control the charging current). Check the voltage on pin 8 of the RTC: with the power on, it should be about 4.3V (5V rail less the diode drop). When the power is turned off, it should dribble down over a few minutes to the battery voltage - and then just sit there. If it keeps dropping (or the battery is flat!) then you should be able to work out where the fault lies by following the chain of resistors.
If the battery is charging up OK, but running down much too fast, then it is likely that a leakage path exists. If the +5V rail isn't hard at zero with the power off then the diode is faulty, otherwise the most likely cause is some residual gunk under one of the parts. It also could be a failing part though.
If the battery is charging up OK, but running down much too fast, then it is likely that a leakage path exists. If the +5V rail isn't hard at zero with the power off then the diode is faulty, otherwise the most likely cause is some residual gunk under one of the parts. It also could be a failing part though.
Statistics: Posted by wiggy — Wed Oct 02, 2024 10:30 pm