Read Panasonic KX-UDT111RU (serv.man3) Service Manual online
9
KX-UDT111RU
4.2.6.
Charge circuit (Include Charger)
Circuit Operation:
When charging with Charger, the charge current is as follows:
DC+(5.5V)
DC+(5.5V)
→ CHARGE+(Charger) → CHARGE+(Handset) → L200 → D200 → Q204 → F201 → BATTERY+... BATTERY- →
R201
→ GND
In this way, the BBIC(IC1) on Handset detects the fact that the battery is charged.
The charge current is controlled by IC1 23pin of Handset.
The charge current is controlled by IC1 23pin of Handset.
Refer to in Power Supply Circuit / Reset Circuit (P.7) .
After CHG_DET became High, CHG_CTRL begins charge control.
Charge current is controlled as follows.
Charge current is controlled as follows.
Charge current repeats ON and OFF as follows.
4.2.7.
Battery Low/Power Down Detector
"Battery Low" and "Power Down" are detected by APUZ (IC1) which checks the battery voltage.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.35V ± 50mV
• Power Down
After battery low, it goes to power down automatically 1 minute later.
IC1-23pin (CHG_CTRL)
Q201
Q200
Q204
Charge ON
High
ON
ON
ON
Charge OFF
Low
OFF
OFF
OFF
Charger
CHG_CUR
CHG_CTRL
CHG_DET
R201
C213
GND
GND
GND
GND
GND
GND
L200
L201
GND
C211
NC
C214
CHG_CTRL
C201
GND
GND
GND
GND
C202
C206
IC200
NC
4
VSS
3
NC
1 OUT
2 VDD
CHG_DET
F201
GND
Q205
Q200
R205
R206
R208
R210
R211
R207
C207
C209
R219
C203
C204
C221
C222
GND
GND
CHG(+)
CHG(-)
BATT+
BATT-
Q204
D200
C216
GND
GND
GND
R214
CHG+
CHG-
Q201
Q203
R215
C205
R209
R213
C212
To Charge
Terminal
Terminal
To Battery
IC1
J1
(DC Jack)
CHG+
CHG-
Charger
Handset
Charge Current
23
24
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