SARA-R4 series - System Integration Manual
UBX-16029218 - R06
Design-in
Page 76 of 102
2.13
Schematic for SARA-R4 series module integration
2.13.1
Schematic for SARA-R4 series modules
Figure 42 is an example of a schematic diagram where a SARA-R4 series module “00” or “01” product version is
integrated into an application board, using all the available interfaces and functions of the module.
3V8
GND
10uF
10nF
SARA-R4 series
52
VCC
53
VCC
51
VCC
68pF
SDA
SCL
26
27
RSVD
GND
18
RESET_N
Application
Processor
Open
drain
output
15
PWR_ON
Open
drain
output
TP
TP
12
TXD
13
RXD
8
DCD
10
RTS
11
CTS
9
DTR
6
DSR
7
RI
TP
TP
TXD
RXD
DCD
RTS
CTS
DTR
DSR
RI
1.8 V DTE
GND
GND
USB 2.0 host
D-
D+
28
USB_D-
29
USB_D+
VBUS
17
VUSB_DET
TP
TP
GND
GND
0
Ω
0
Ω
0
Ω
0
Ω
47pF
SIM Card Holder
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
GPIO5
470k
ESD ESD ESD ESD ESD ESD
1k
TP
V_INT
3V8
Network
Indicator
62
ANT_DET
10k
27pF
ESD
68nH
56
Connector
External
antenna
33pF
ANT
TP
0
Ω
39nH
15pF
19
25
24
23
16
GPIO6
GPIO4
GPIO3
GPIO2
GPIO1
15pF
100nF
Figure 42: Example of schematic diagram to integrate a SARA-R4 module using all available interfaces
13
13
Flow control is not supported by “00”, “01” and “02” product versions, but the
RTS
input has to be set low to communicate over UART
