Read Panasonic KX-TCA285RU Service Manual online
8
KX-TCA285RU
4.2.4.
Clock Circuit
4.2.5.
Bus Access
The SRAM is used with an async mode.
4.2.6.
Charge circuit
Circuit Operation:
When charging with Charger, the charge current is as follows:
DC+(5.5V)
DC+(5.5V)
F1(Charger) D1(Charger) IC1(Charger) L1(Charger) CHARGE+(Charger) CHARGE+(Handset)
IC203
F201 BATTERY+... BATTERY- R201 GND CHARGE-(Handset) CHARGE-(Charger) L2(Charger)
GND(Charger)
In this way, the BBIC(IC1) on Handset detects the fact that the battery is charged.
The charge current is controlled by IC203 of Handset.
The charge current is controlled by IC203 of Handset.
Include Charger
Charger current
GND
GND
GND
GND
GND
IC1
1
VO
2
NC1
3
GND
4
CS
5 CONT
6 NC2
7 NC3
8 VIN
9
6 NC2
7 NC3
8 VIN
9
FIN
D1
F1
GND
TP3
CHG+
TP4
CHG-
J1
1
2
C2
C1
L1
L2
C3
Charger
Handset
CHG_CUR
COUNT
CHG_DET
CHG_state
C211
GND
C218
GND
R217
GND
GND
R220
IC203
1 VCC
2 ROSC
3 LED
4 GND
5 VDD
2 ROSC
3 LED
4 GND
5 VDD
6
TH
7
TMRCNT
8
RICHG
9
VSENSE
10
BAT
11
FIN
C213
GND
R208
GND
CHG+
CHG-
R218
R219
R216
GND
R211
GND
R210
CN202
1
CN201
1
Li-ION
Battery
F201
C2
0
6
GND
C2
0
6
R
201
GND
IC1
10
-
+
TH
IC100
24
7
L2
24
88
R209
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