When PCA8565 work at 90~125℃,CPU can't read the true time from PCA8565.But the timer in the PCA8565 is working normally.When the temperature drops below 90℃,PCA8565 return to normal working condition.
The circuit diagram as follow.
All chips and devices can work at 125 ℃.What factors will cause this error?
The correct data:
The wrong data:
First off, please accept our apologies for this delayed response.
A few questions to let us start looking into it:
1. Crystal CL?
2. Measure the 32.768kHz at the CLKOUT pin (need an external pull-up).
3. Values of Control registers?
I took off all resistors and capacitors,leave only PAC8565 and crystal.
Then the part of clock can work normally until 125℃.