SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26
Appendix
Page 211 of 217
B.3
Schematic for SARA-G3 and SARA-U2 integration
Figure 101 shows an example of a schematic diagram where a SARA-G3 or SARA-U2 series module can be
integrated into the same application board, using all the available interfaces and functions of the modules. The
different mounting options for the external parts are highlighted in different colors as described in the legend,
according to the interfaces supported by the relative modules.
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
10nF
100nF
56pF
SARA-G3 / SARA-U2
52
VCC
53
VCC
51
VCC
+
100µF
2
V_BCKP
GND
GND
GND
RTC
back-up
1.8V UART DTE
1.8V UART DTE
16
RSVD / GPIO1
3V8
Network
Indicator
18
RESET_N
Application
Processor
Open
Drain
Output
15
PWR_ON
100k
Open
Drain
Output
TXD
RXD
29
TXD_AUX / USB_D+
28
RXD_AUX / USB_D-
0
Ω
0
Ω
TP
TP
15pF
33
RSVD
V_BCKP
TP
TP
47pF
SIM Card
Connector
CCVCC (C1)
CCVPP (C6)
CCIO (C7)
CCCLK (C3)
CCRST (C2)
GND (C5)
47pF 47pF
100nF
41
VSIM
39
SIM_IO
38
SIM_CLK
40
SIM_RST
47pF
SW1
SW2
4
V_INT
42
SIM_DET
470k
ESD ESD ESD ESD ESD ESD
56
ANT
62
ANT_DET
10k
82nH
33pF
Connector
27pF
ESD
External
Antenna
1k
TP
u-blox 1.8V
GNSS Receiver
4.7k
OUT
IN
GND
LDO Regulator
SHDN
RSVD / SDA
RSVD / SCL
4.7k
3V8
1V8_GPS
SDA2
SCL2
32K_OUT / GPIO3
RSVD / GPIO4
TxD1
EXTINT0
26
27
24
25
47k
VCC
RSVD / GPIO2
23
V_INT
BCLK
LRCLK
10µF
1µF
Audio Codec
MAX9860
SDIN
SDOUT
SDA
SCL
36
RSVD / I2S_CLK
34
RSVD / I2S_WA
35
RSVD / I2S_TXD
37
RSVD / I2S_RXD
19
RSVD / CODEC_CLK
MCLK
IRQn
10k
100nF
VDD
Speaker
OUTP
OUTN
Microphone
MICBIAS
1µF
2.2k
1µF
1µF
MICLN
MICLP
MICGND
2.2k
ESD ESD
V_INT
10nF
10nF
EMI
EMI
27pF
27pF
10nF
EMI
EMI
ESD ESD
27pF
27pF
10nF
31
EXT32K / RSVD
0
Ω
49
RSVD / MIC_P
2.2k
2.2k
2.2k
48
RSVD / MIC_N
2.2k
10uF
46
RSVD / MIC_BIAS
47
RSVD / MIC_GND
100nF
100nF
44
RSVD / SPK_P
45
RSVD / SPK_N
V_INT
VBUS
D+
D-
GND
17
RSVD / VUSB_DET
GND
USB 2.0 Host
0
Ω
0
Ω
0
Ω
or
Ferrite Bead
0
Ω
0
Ω
TP
TP
TP
0
Ω
for SARA-G300 / SARA-G310
Mount for SARA-G300 / SARA-G310 modules
Mount for SARA-G340 / SARA-G350 modules
Mount for SARA-U2 modules
Mount for SARA-G3 modules
Mount for SARA-G340 / SARA-G350 / SARA-U2 modules
Mount for SARA-G3 and SARA-U2 modules
LEGEND
+
0
Ω
0
Ω
0
Ω
TP
TP
15pF
39nH
0
Ω
for SARA-G3 modules
0
Ω
TP
TP
0
Ω
0
Ω
0
Ω
TP
TP
0
Ω
TP
Figure 101: Example of complete schematic diagram to integrate SARA-G3 and SARA-U2 modules on the same application board
