Block Diagram (Handset) - Panasonic KX-TG8231B Service Manual

4.3.

Block Diagram (Handset)

RECEIVER
MIC
CN4
1
2
3
4
5
Headset
KEY-BACK LIGHT
SPEAKER
CHARGE(+)
CHARGE
CHARGE
CIRCUIT
CONTACTS
Q4,Q5,Q9
R7
CHARGE(-)
D7
J1
SWITCHED
BATTERY
SUPPLY
TERMINAL
Q1 Q1
J2
LCD
LCD-BACK LIGHT
66
67
72
75
32
30
CHARGE
62
CHARGE DETECT
52
45
SCL
EEPROM
44
IC3 SDA
VBAT1 58
DC/DC-SWITCH
56
2.5V
4.0V
59
2.5V
Q3
1.8V
60
1.8V
Q2
CD 11
77
RESET
CSB 6
SDA
47
SCL 46
5
Speech Burst
Decoding Decoding
D/A
Speech Burst
Encoding Encoding
A/D
ADPCM
Codec
Analog
Interface
Filter
Front
End
DSP
CPU
27,28,34,35,36,74
BBIC
IC1
KX-TGA820 BLOCK DIAGRAM (HANDSET)
11
KX-TG8231B/KX-TG8232B/KX-TGA820B
RXDA
23
TXDA
22
19 RSSI
25 SYDA
RF
26 SYEN
24 SYCL
BMC
XTAL
16 X1
10.368
MHz
17
ON SWITCH
61
ROWS
1,12,40,76
KEYPAD
COLUMNS
RF
Module
IC4
BATTERY