Panasonic KX-UDT121RU (serv.man4) Service Manual ▷ View online
9
KX-UDT121RU
Include Charger
• The charge current is controlled by IC203 of Handset.
Charge current characteristic is as follows.
Charging method is CCCV. (CC: constant current, CV: constant voltage)
Charging method is CCCV. (CC: constant current, CV: constant voltage)
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
CHG_DET
COUNT
CHG+
CHG-
R210
L200
L201
C211
GND
CHG(+)
CHG(-)
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
R219
R218
GND
DOUT3.0V
R207
NC
R208
GND
R209
R216
D203
NC
Li-ION
Battery
F201
C2
0
6
GND
C2
0
6
R
201
GND
IC1
24
10
-
+
TH
IC100
24
CHG_state
7
CHG_CUR
L2
88
Charger
Handset
CC charge
CV charge
Charge stop
CC charge
CV charge
Charge stop
I mA
I/10 mA
4.2 V
3.97 V
t
V, I
Battery voltage
Charge current
0 mA
0 V
Charge complete
Recharge
10
KX-UDT121RU
• IC100-88pin (CHG_state)
• When handset is put on charger, handset detects battery charge.
• TH(IC203-6pin) is temperature detecting pin of battery.
The charge temperature range is 5 degree C to 40 degree C.
If charge temperature is above 40 degree C or below 5 degree C, charge stops.
If charge temperature is above 40 degree C or below 5 degree C, charge stops.
4.2.7.
Battery Low/Power Down Detector
"Battery Low" and "Power Down" are detected by BBIC (IC1) which checks the battery voltage.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 3.4V ± 50mV
The BBIC detects this level and "
“ starts flashing.
• Power Down
Battery voltage: V(Batt) 3.2V ± 50mV
The BBIC detects this level and power down.
The BBIC detects this level and power down.
IC100-88pin (CHG_state)
Charge controll
High
Charging
Low
Charge complete
Charge detect
IC1-24pin (CHG_DET)
Charge LED (Red LED)
ON
Above 1.5V
ON
OFF
Below 1.2V
OFF
Charge
Battery temperature
ON
0
°C to 40 °C
OFF
Below 5
°C or above 40 °C
11
KX-UDT121RU
4.2.8.
LCD Circuit
• The LCD is controlled by SPI (LCD_SCL, LCD_RESET, LCD_CS, LCD_SID, LCD_CD).
• LCD back-light has 3 modes ( Brightness 1/2/3*) and back-light OFF.
• LCD back-light has 3 modes ( Brightness 1/2/3*) and back-light OFF.
*Brightness level: Brightness 1 > Brightness 2 > Brightness 3
Back-light Mode
IC401-4pin (CP_ON)
IC401-2pin (LCD_BL1)
IC401-3pin (LCD_BL2)
Brightness 1
High
High
High
Brightness 2
High
High
Low
Brightness 3
High
Low
Low
Back-light OFF
Low
Low
Low
12
KX-UDT121RU
4.2.9.
LED Circuit
• DPU(IC100) controls each LEDs.
4.2.10. Vib Circuit
• Vibrator is controlled by IC1-23 pin.
Type of LED
LED ON
LED OFF
Bell LED (Green)
LED531
LED531
IC401-7pin = High
IC401-7pin = Low
Bell LED (RED)
LED530
LED530
IC401-5pin = High
IC401-5pin = Low
Key back-light LEDs (Yellow green)
LED520 - LED529
LED520 - LED529
IC401-3pin = High
(Q521 = ON)
(Q521 = ON)
IC401-3pin = Low
(Q521 = OFF)
(Q521 = OFF)
VIB ON
VIB OFF
IC1-23 pin (Q540)
High
(ON)
Low
(OFF)
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