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1.2 EVK-R6 and EVK-L6 block diagram and basic description
Figure 2
shows the main interfaces and internal connections of EVK-R6 and EVK-L6 evaluation kits:
Cellular RS232
RS232
(Main UART)
UART
(J500)
converter
Cellular USB
USB
(Main UART)
UART
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF
LDO
GNSS
module
USB
GNSS adapter board
Figure 2: Block diagram of EVK-R6 and EVK-L6 for LARA-R6 and LARA-L6 modules
The EVK-R6 and EVK-L6 is formed by three boards:
•
The lower one, called EVB-WL3 or simply EVB, contains the power supply and other peripherals for
the cellular module (such as SIM card holder, reset button and power-on button).
•
The cellular adapter board, called ADP-R6 / ADP-L6, contains the LARA-R6 / LARA-L6 cellular
module, the cellular antenna connectors (ANT / ANT DIV), the USB "native" connector (J105), the
USB "two UARTs" connector (J201), the UARTs routing switch (J248), the VCC jumper (J109) and
an audio codec.
•
The GNSS adapter board, called ADP-GNSS, contains the u-blox GNSS module, the GNSS antenna
connector and the USB connector for the GNSS module.
The cellular and the GNSS adapter boards (ADP-R6/L6 and ADP-GNSS respectively) are connected by
means of male header board-to-board connectors provided on the bottom of the adapter boards and
their corresponding female connectors provided on top of the lower board (EVB-WL3).
The USB interface of the cellular module is available on the native USB connector (J105) on the cellular
adapter board (ADP-R6 / ADP-L6).
The main UART and the auxiliary UART interfaces of the cellular module can be routed as follows, by
means of the 3-way UARTs' routing switch (J248) available on the cellular adapter board (ADP-R6 /
ADP-L6) as illustrated in
•
EVB position (pin 1-2 of J248 shorted by jumper socket): main UART routed as 8-wire interface to
the lower EVB-WL3 board by the means of dual-in-line male board-to-board connectors mounted
on the bottom of the adapter board ADP-R6/L6. According to the mini-USB / DB9 switch (SW403)
setting on the EVB-WL3, the main 8-wire UART interface can be accessed on the USB connector
(J501) or on the RS232 DB9 connector (J500) on the EVB-WL3, with the on-board / B2B switch
(SW401) on the EVB-WL3 set to "on-board". The auxiliary UART interface is not available.
•
ADP position (pin 2-3 of J248 shorted by jumper socket): main UART and auxiliary UART routed
as 4-wire interfaces to the USB two UARTs connector (J201) mounted on the adapter board, with
the on-board / B2B switch (SW401) on the EVB-WL3 board is set to "B2B".
•
No position (no jumper socket on J248): main 8-wire UART interface or main 4-wire UART with
auxiliary 4-wire UART interfaces, routed to the dual-in-line male header connectors mounted on
the top of the adapter board ADP-R6/L6, allowing a connection to an external compatible device
with the on-board / B2B switch (SW401) on the EVB-WL3 board set to "B2B".
UBX-21035387 - R03
C1-Public
MiniUSB/DB9
On-Board/B2B
switch
switch
UART
(SW403)
(SW401)
VCC jumper
3.8 V
Step - Down
(J404)
GNSS switch
GPIO2/3/4
(SW304)
I
C
2
Figure
3:
Starting up
EVK-R6 and EVK-L6 - User guide
Cellular USB
ANT
ANT DIV
(two UARTs)
(J106)
(J202)
(J201)
USB/UART
converter
UARTs
LARA-R6/L6
Cellular
module
(J248)
VCC jumper
(J109)
Audio
LARA-R6/L6
Codec
Native
adapter board
USB
(ADP-R6/L6)
(J105)
Headset jack
(J303)
SIM
card holder
(J300)
Reset
(SW303)
Power-on
(SW302)
EVB-WL3
Page 5 of 27
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