Help CPU Usage while charging

[Argjent]

I noticed that while the phone is charging, it never drops to 0 % CPU usage, so no deep sleep. I searched for an answer but none of them were about S2.
Is this a normal occurrence in the Android OS or the S2 ?

 

[immortalneo]

Its normal mate.

Deep sleep doesn't occur while charging. CPU is at 200 MHz at this time.

I don't know the reason why though...

 

[Harry2]

The CPU works as charging controller, eg. controls that the battery temperature remains in its charging operating range.

The Li-Ion battery's temperature operating range is:
for discharging -20C (-4F) to +60C (+140F).
for charging 0C (+32F) to +45C (+113F).

The battery won't be charged if its temperature is below 0C (+32F) or above +45C (+113F) because the phone's charge controlling will project the battery.
Therefore it'll shut down charging until the battery's temperature will meet again the charge operating range.

Harry