SARA-G450 - System integration manual
UBX-18046432 - R08 Design-in Page 115 of 143
C1-Public
2.12 Schematic for SARA-G450 modules integration
Figure 73 is an example of a schematic diagram where a SARA-G450 module is integrated into an
application board, using all the available interfaces and functions of the module.
TXD
RXD
RTS
CTS
DTR
DSR
RI
DCD
GND
12 TXD
9 DTR
13 RXD
10 RTS
11 CTS
6 DSR
7 RI
8 DCD
GND
3V8
GND
330µF
10nF100nF 56pF
SARA-G450
52 VCC
53 VCC
51 VCC
+
70mF
2 V_BCKP
GND
RTC
back-up
1.8V DTE
16 GPIO1
3V8
Network
indicator
18
PWR_OFF
Application
processor
Open
drain
output
15 PWR_ON
Open
drain
output
I2S_RXD
I2S_CLK
I2S_TXD
I2S_WA
37
36
35
34
15pF
33 RSVD
31 RSVD
17 TXD_AUX
19 RXD_AUX
33pF
SIM card holder
CCVCC (C1)
CCVPP (C6)
CCIO (C7)
CCCLK (C3)
CCRST (C2)
GND (C5)
33pF33pF 1µF
41VSIM
39SIM_IO
38SIM_CLK
40SIM_RST
33pF
SW1
SW2
4V_INT
42SIM_DET
470k
ESD ESD ESD ESD ESD ESD
56
ANT
62ANT_DET
10k 68nH
33pF
Connector
27pF
ESD
External
antenna
V_BCKP
1k
TP
TP
TP
21 VSEL
0Ω
TP
0Ω
TP
0Ω
TP
0Ω
TP
GND
29 TXD_FT
28 RXD_FT
TP
TP
4.7k
GND
1.8V DTE
TXD
RXD
GND
49MIC_P
2.2k
2.2k 2.2k
48MIC_N
2.2k
10uF
46
MIC_BIAS
47
MIC_GND
100nF
100nF
44SPK_P
45SPK_N
82nH
82nH
27pF27pF
Connector
Microphone
ESDESD
27pF 27pF
Speaker
Connector
ESD ESD
u-blox 1.8 V
GNSS receiver
4.7k
OUTIN
GND
LDO regulator
SHDN
SDA
SCL
4.7k
3V8 1V8_GPS
SDA2
SCL2
GPIO3
GPIO4
26
27
24
25
47k
VCC
GPIO2
23
Not supported by “00” product version
Not supported by “00” product version
Figure 73: Example of schematic diagram to integrate a SARA-G450 module in an application, using all available interfaces
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