Panasonic KX-UDT121RU (serv.man4) Service Manual ▷ View online
5
KX-UDT121RU
3 Specifications
RF Specifications (DECT)
RF Specifications (Bluetooth)
6
KX-UDT121RU
4 Technical Descriptions
4.1.
Block Diagram
RF
BAT +
VB
AT(3.0V)
AT(3.0V)
BAT -
CHG -
CHG +
Power Supp
ly
for Backlight
Key (2
6)
(Tri
an
gl
gl
e Matri
x
)
LCD_Backlight
Key_Backlight
Vib_Motor
M
MIC
RECEI
VER
HEADSET
JA
C
C
K
SPEAKER
X'
TAL
TAL
13
.8
.8
24MHz
5.0v
BBIC
(APU)
ANT
APU-DP
U I
/F
/F
KB
IO1
IO1
8
MIP
MIN
HSSPOUTP
LO
UT
UT
HSMIP
HEADSET_DET
SPOUTP
SPOUTN
Vib_CTRL
CP_ON
LCD_BL1
LCD_BL2
BEL
L_
RE
RE
D /
GR
EE
N
N
CHG_DET
CH
G_
C
C
U
R
Serial Flash Memory
32
MB
MB
it
1.82" TFT Color LCD
1
28x160dot
RF
Circuit
SRAM
4MBit
BBIC
(DPU)
SPI
GPIO
RF I/F
UART CON (3pin)
Ua
rt I/F
JTAG I/F
Li-ion
JTAG
Charge
Cir
cui
t
cui
t
3.
7v / 700mAh
5.0v
BT UNIT
PCM I/F
ANT
CHG_
Sta
te
I/O P
o
rt
IC
I2C
TH
Pow
e
r Supp
ly
for B
T
BT3.0v
BATT
LCD_
BL2
LCD_
BL1
BT_RE
SET
BT_WakeUPOUT
VDDC 1.8v
DOU
T3.0
V
STATUS /
FAULT
BT_ON
VBAT
(3
.0V)
DOUT3.0V
Pow
e
r
Supp
ly
for VBAT
BELL_LED
IC202
IC
1
1
IC
10
0
10
0
IC
10
2
10
2
IC
10
1
10
1
IC601
IC203
IC401
IC201
IC205
X1
address/data bus
7
KX-UDT121RU
4.2.
Circuit Operations
4.2.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset).
• BBIC (Base Band IC): IC100
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, LCD, LED, SRAM, Flash ROM)
- All interfaces (ex: Key, Detector Circuit, Charge, LCD, LED, SRAM, Flash ROM)
• SRAM: IC101
- Application data and code are temporarily stored.
• Flash ROM (substitute EEPROM): IC102
- Adjustment data, program data and temporary user data are stored.
• RF IC: IC1
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
• Bluetooth Unit: IC601
4.2.2.
Power Supply Circuit / Reset Circuit
The power supply of each IC is as follows.
The Power On Reset is designed to guarantee power-on of the system only when 1.8v and 3.0v voltages exist.
The Power On Reset is designed to guarantee power-on of the system only when 1.8v and 3.0v voltages exist.
4.2.3.
Reset Circuit
The reset signal is generated with IC1(44Pin).
When VBAT3V that is IC202's output exceeds 1.7V, release the Reset
When VBAT3V that is IC202's output exceeds 1.7V, release the Reset
8
KX-UDT121RU
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) → CHARGE+(Charger) → CHARGE+(Handset) → L200 → IC203
→ 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 IC203 of Handset.
The charge current is controlled by IC203 of Handset.
Refer to in Power Supply Circuit / Reset Circuit (P.7) .
Click on the first or last page to see other KX-UDT121RU (serv.man4) service manuals if exist.