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1.2 EVK-R4 block diagram
Figure 4
shows the main interfaces and internal connections of the evaluation kit for SARA-R410M
and SARA-R412M modules:
Cellular RS232
RS232
(UART)
UART
(J500)
converter
Cellular USB
USB
(UART)
UART
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF_IN
GNSS
module
USB
GNSS adapter board
Figure 4: Block diagram of the evaluation kit for SARA-R410M and SARA-R412M modules
Figure 5
shows the main interfaces and internal connections of the evaluation kit for SARA-R422M8S
modules:
Cellular RS232
RS232
(Main UART)
UART
(J500)
converter
Cellular USB
USB
(Main UART + TXD_GNSS)
UART
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF_IN
GNSS
module
USB
GNSS adapter board
Figure 5: Block diagram of the evaluation kit for SARA-R422M8S modules
The EVK-R4 is formed by three boards:
1.
The lower one, called EVB-WL3, contains the power supply and other peripherals for the SARA-R4
series cellular module (SIM card holder, reset button and power-on / power-ctrl button).
2.
The cellular adapter board, called ADP-R4, contains the SARA-R4 cellular module, antenna
connectors for the cellular RF interface and the GNSS RF interface
connectors for the two UART interfaces
DIL header connectors (J300 and J301) making accessible interfaces of the SARA-R4 module.
3.
The GNSS adapter board, called ADP-GNSS, contains the u-blox NEO-M8N GNSS module, the
GNSS antenna connector and the USB connector for the u-blox NEO-M8N GNSS module.
1
EVK-R422M8S only.
UBX-16029216 - R07
C1-Public
MiniUSB/DB9
On-Board/B2B
switch
switch
(SW403)
(SW401)
VCC jumper
3.8 V
Step - Down
LDO
GNSS switch
GPIO2/3/4
(SW304)
MiniUSB/DB9
On-board/B2B
switch
switch
TXD_GNSS
(SW403)
(SW401)
VCC jumper
3.8 V
Step - down
(J404)
LDO
GNSS switch
GPIO2/3/4
(SW304)
I2C
ANT
UART
SARA-R41xM
Cellular
module
(J404)
I
2
C
Native
USB
Cellular USB
(two UARTs)
(J201)
UART
USB/UART
UART
converter
(J248)
TXD_GNSS
VCC jumper
(J109)
SARA-R422M8S
adapter board
1
and the USB interface of the SARA-R4 module, and the
Starting up
EVK-R4 - User guide
SIM
card holder
(J300)
Reset
(SW303)
Power-on
(SW302)
SARA-R41xM
adapter board
EVB-WL3
CEL
ANT
(J106)
card holder
SARA-R422M8S
module
Power-ctrl
(SW302)
GNSS
Native
ANT
USB
(J112)
EVB-WL3
(J105)
1
of the SARA-R4 module, USB
SIM
(J300)
Page 8 of 31
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