– 21 –
– 22 –
SPP-M937
5-3. BLOCK DIAGRAM – HANDSET SECTION –
02
COL0 – COL2
BUZ1
(BUZZER)
TX B+
D7
BUZZER DRIVE
Q14, 17
BUFFER
U5 (4/4)
RX MUTE
Q21
LOW-PASS FILTER
U5 (2/4)
VOLUME
CONTROL
SW23
ATTENUATOR
Q19
ANT2
(ANTENNA)
EXPANDER
CIRCUIT
COMPRESSOR
CIRCUIT
FIL2
IN
LOW-PASS
FILTER
2
13
14
FIL2
OUT
1
FIL1
IN
LOW-PASS
FILTER
3
FIL1
OUT
4
EXP
OUT
20
COMP
OUT
COMP
MUTE
5
16
BUFFER
U5 (3/4)
BUFFER
Q1
OSC
Q12
CAR DET
Q3, 4
RO1
U8
(SPEAKER)
18
RO2
17
RX MUTE
AUDIO ATT
RX MUTE
D10
KEY MATRIX
AUDIO ATT
DI
CLK
DO
CS
EEP EN
EEP IN
PLL DATA
PLL CLK
PLL EN
X1
4MHz
42
XOUT
16
XIN
15
1
43
44
41
3
2
4
1
B+ SWITCH
(FOR RX SYSTEM)
Q16
LOW BATT
DET
U5 (1/4), Q5
B+ SWITCH
(FOR TX SYSTEM)
Q13
CRADLE
DETECT
Q15
BACKUP B+
RX B+
BEEP
OUT
OUTPUT
2
35
LO BAT
26
36
14
3
VDD 2
6
1
• SIGNAL PATH
: RX
: TX
PRE
IN
PREAMP
23
RIN
RO1/RO2
AMP
MIC
AMP
U9
MIC
19
MIC
NF
10
SW23
VOL
X2
32.768kHz
XTOUT
39
XTIN
38
9
RX DATA
31
LINE1 LED
RX MUTE
27
AUDIO ATTN
32
28
TX DATA
30
LINE2 LED
INT COM LED
D10
LINE 1
D9
D9
LINE 2
D5
CHARGE
TERMINAL
RECHARGEABLE
BATTERY PACK
(BP-T23)
DC 3.6V 600mAh
RESET SIGNAL GENERATOR
U1
3V REG
U2
BACKUP B+
D5
INTERCOM/BATT LOW
12 – 10
19 – 25, 29
EEPROM
U3
SYSTEM CONTROLLER
U6
COMPRESSOR, EXPANDER, NOISE GATE
U7
8
7
5
ROW0/IRQ, ROW1 – ROW7
+
–
RESET
TX MUTE
TX ENABLE
CAR DET
CRA DET
RX ENABLE
HAND RF BOARD
4 VO
VIN
RX AUDIO
TX AUDIO
PLL DATA
PLL CLK
PLL EN
PLL REF
RSSI
ANT
7
6
8
9
J3
I
Содержание SPP-M937
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