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SPP-M937
5-3. BLOCK DIAGRAM – HANDSET SECTION –
HAND RF BOARD
ANT2
(ANTENNA)
ANT
EEPROM
U3
OSC
DI
3
Q12
2
CLK
DO
4
CS
1
41
44
43
1
42
16
02
RX AUDIO
TX AUDIO
CAR DET
Q3, 4
X1
X2
4MHz
32.768kHz
15
39
38
9
SYSTEM CONTROLLER
ROW0/IRQ, ROW1 – ROW7
COL0 – COL2
19 – 25, 29
12 – 10
KEY MATRIX
– 21 –
BUFFER
13
14
U5 (4/4)
RX MUTE
ATTENUATOR
Q21
Q19
6
LOW-PASS FILTER
U5 (2/4)
7
BUFFER
Q1
D10
D9
LINE 1
LINE 2
D9
D10
31
27
32
8
7
U6
2
26
35
BUZ1
(BUZZER)
BUZZER DRIVE
Q14, 17
FIL2
EXP
FIL2
PRE
VOLUME
OUT
OUT
IN
IN
EXPANDER
2
1
23
20
CONTROL
CIRCUIT
LOW-PASS
PREAMP
FILTER
COMPRESSOR, EXPANDER, NOISE GATE
U7
LOW-PASS
FILTER
FIL1
COMP
FIL1
OUT
OUT
IN
BUFFER
3
4
8
9
5
U5 (3/4)
D5
INTERCOM/BATT LOW
BACKUP B+
D5
5
30
36
14
RESET SIGNAL GENERATOR
U1
BACKUP B+
1
OUT
B+ SWITCH
(FOR TX SYSTEM)
TX B+
Q13
4 VO
OUTPUT
B+ SWITCH
3V REG
RX B+
(FOR RX SYSTEM)
U2
Q16
LOW BATT
DET
U5 (1/4), Q5
– 22 –
U8
RO2
(SPEAKER)
SW23
17
VOL
RIN
19
18
RO1
SW23
RO1/RO2
AMP
J3
I
MIC
MIC
AMP
NF
COMPRESSOR
10
CIRCUIT
COMP
MUTE
16
U9
MIC
28
CRADLE
+
CRA DET
3
DETECT
CHARGE
Q15
TERMINAL
–
D7
VDD 2
VIN
6
RECHARGEABLE
BATTERY PACK
(BP-T23)
DC 3.6V 600mAh
• SIGNAL PATH
: RX
: TX
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