- When charging the handset on the Charger Unit, the charge current
is as follows;
DC+(5.5V ~ 6V) D1 R1, R2 CHARGE+(Charger Unit)
CHARGE+(Handset) F1 BATTERY+ ... Battery ... BATTERY-
R21 GND CHARGE-(Handset) CHARGE-(Charger Unit)
GND DC-(GND)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q2 of Handset.
Note:
Refer to Fig.101 in Power Supply Circuit ().
22.4. Battery Low/Power Down Detector
Circuit Operation:
"Battery Low" and "Power Down" are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
- Battery Low
Battery voltage: V(Batt) < 2.3V
The BBIC detects this level and " " starts flashing and
"battery alarm" starts ringing.
- Power Down
Battery voltage: V(Batt) < 2.2V
The BBIC detects this level and power down.
Note:
Refer to ADJUSTMENTS (HANDSET) ().
23. CIRCUIT OPERATION (CHARGER UNIT)
23.1. Power Supply Circuit
The power supply is as shown.
60
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