Panasonic KX-TC2100BXB, Service Manual

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16.3. Battery Low / Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by RF IC which check the voltage from battery. Shortly, every detected blocks
are inside of RF IC. The detected voltage is as follows;
•
Battery Low
Battery voltage : V(Batt) < 3.457V
The CPU detects the level and “Recharge battery” LED starts flashing.
•
Power Down
Battery voltage : V(Batt) < 3.0V
The output of RF IC (Power Down) becomes low level, then CPU stops working to keep the data (CH number, ID Code, etc.)
<Fig. 6>
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KX-TC2100BXB / KX-TC2100B XS / KX-TC2100B XT / KX-TC2100BXW