Battery Low / Power Down Detector - Panasonic KX-TC1468LBB Service Manual

KX-TC1468LBB

14.3. 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 inseide of RF IC. The detected voltage is as follows;
· Battery Low
Battery voltage : V(Batt) < 3.57V
The CPU detects this level and IN USE “
· Power Down
Battery voltage : V(Batt) < 3.36V
The output of RF IC (P-DOWN) becomes low level, then CPU stops working to keep the data (CH number, ID Code, etc.)
” starts flashing.
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