Developer Board Schematics - Multitech SocketModem GSM Hardware Manual

Developer Board Schematics

4,5 VIN
U9
3
4
9
R69 22K
C45 470pF
5
GND
1
GND
16 V
6
GND
2
C46 .1uF
7
JP6
P6
LTC1778
1 GND
2
3
VCC
SHUNT
HEADER-3
R71
3 TXCLK
VCC
JP12
P12
SHUNT ON:
1
1&2=TDCLK 2
3
2&3=SYNC
SHUNT HEADER-3
3 RXCLK
3 MBAUD
GND
VCC
3 SLP
3 TXD
3 RXD
3 RTS
3 CTS
3 DSR
3 DTR
3 DCD
3 RI
3,4 RING
3,4 TIP
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers
C43 + 10uF
GND
10 V
CR1 MMBD301LT1
11
VRNG INTVCC
16
FCB BOOST
C44 .22uF 16 V
13
GND
EXTVCC PGND
14
ITH SW
15
RUN/SS TG
12
SGND BG
R70 49.9K
8
PGOOD VFB VCC
10
ION VIN
R1 100K R31 15.8K
GND
R32 24.3K
U15
8
1
S1 D4
7
2
S2 D3
3 6
GND
S3 D2
2.2M VIN
4 5
G1 D1
Si4840DY
U26
21
8
R10UT R1IN
20 9
R2OUT R2IN
18 11
R3OUT R3IN
5
24
T1IN T1OUT
23 6
T2IN T2OUT
22 7
T3IN T3OUT
19 10
T4IN T4OUT
17 12
T5IN T5OUT
27 28
V+ C1+
4 25
C1-
V-
16 1
R1OUTB C2+
15 3
MBAUD C2-
26 14
VCC VCC SHDN
2
13
GND GND
GND EN
ICL3237E
JP4
1 2
3 4
GND 5 6
7 8
VCC
9 10
HEADER-5x2
C49 100uF 6.3 V
GND
C48 100uF 6.3 V
C176 .01uF
C177 .1uF 16 V
L1 15uH
VCC
CR2 40V/3A
GND
U14
GND
1 8
S1 D4
2 7
S2 D3
3 6
S3 D2
4 5
G1 D1
Si4840DY
VCC
GND
JP2
1
2
HEADER-2
Chapter 5 – The SocketModem Developer Board
S1
R247 1
5 1
GND
2
4 3
GND
SW-SPDT
+ + + +
GND
VR1 LD29300
1 3
VIN VOUT
C175
1uF
16 V
GND GND
U22 TC1262
VCC
1
3
VIN VOUT
VDD3_3
C178
1uF
16 V
GND GND
D1
MB4S
1 2
GND
J1
1
14
2
15
3
16
4
17
5
18
6
19
27
7
GND CGND
20
26
8
CGND
21
R16 330
9
22
CGND
10
R245 0
23
CGND
11
24
CGND
12
25
CGND
R246 0
13
25-POS/D-SUB
28
J7
1 4
L2
3
2
2 3
1
ZJYS-2
ZDX-POWER-CON
VCC5
JP9
P9
1
2
3
SHUNT
HEADER-3
R84 0
GND
R85 0
GND
R86 0
GND
R87 0
GND