BeckerTech,
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Have anyone used the M41T93 RTC from ST?
Hi
I have a technical question regarding the M41T93 Real time clock from ST Microelectronics. Let me describe the problem.
After setting up the chip, it keeps time, all is well. It is supposed to keep time when you remove the power unexpectedly, but it does not. If I probe on the crystal while there is battery backup, then the crystal keeps on oscillating, but it does not keep time. After the power comes back again, the flags register does not indicate a oscillator fail, thus the crystal did in fact keep on oscillating. But, even after clearing the Halt bit on start up, the time read is the time of power down.
In short, with battery backup, when power is removed unexpectedly, the oscillator keeps oscillating, but it does not keep time.
Note, I am not confusing this with the timestamp function. Even after I have cleared the Halt bit, the time which is actually supposed to run in the background of the chip, does not keep running.
What could be the problem? What am I missing?
Regards
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by: BeckerTechPosted on 2009-08-18 at 04:00:30ID: 25121795
Solution:
Add a pull up resister from the Enable line to the battery supply. This keeps the chip "unselected" during power down, becuase, in power down, the Micro, which does not have power, "pulls" the enable line low, which causes the M41T93 to be "selected", which prevents it keeping time correctly...
Regards