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1.2 EVK-R8 block diagram and basic description
Figure 2
shows the main interfaces and internal connections of the EVK-R8 evaluation kit:
RS232
RS232
(Cellular Main UART)
UART
(J500)
converter
USB
USB
(Cellular Main UART + GNSS UART)
2-UART
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF_IN
LDO
GNSS
module
USB
GNSS adapter board
Figure 2: Block diagram of EVK-R8
The EVK-R8 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 LENA-R8 adapter board, called ADP-R8, contains the LENA-R8 module, the cellular antenna
connector (ANT), the cellular USB "native" connector (J700), the cellular USB boot slide switch
(J200), the cellular USB "two UARTs" connector (J201), the cellular UARTs routing switch (J601),
the cellular VCC jumper (J102), an audio codec, the LENA-R8001M10 GNSS antenna connector
(ANT_GNSS), the LENA-R8001M10 VCC_GNSS enable jumper (J701), and the LENA-R8001M10
VBCKP_GNSS enable jumper (J702).
•
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 LENA-R8 and the GNSS adapter boards (ADP-R8 and ADP-GNSS respectively) are connected by
male header board-to-board connectors on the bottom of the adapter boards and their corresponding
female connectors on top of the lower board (EVB-WL3).
The USB interface of the LENA-R8 cellular system is available on the native USB connector (J700) on
the cellular adapter board (ADP-R8).
The main UART and the auxiliary UART interfaces of the LENA-R8 cellular system can be routed as
follows, by the 3-way UARTs' routing switch (J601) available on the LENA-R8 adapter board (ADP-R8)
as illustrated in
Figure
•
EVB position (pin 1-2 of J601 shorted by jumper socket): main UART routed as 8-wire interface to
the lower EVB-WL3 board by the dual-in-line male board-to-board connectors mounted on the
bottom of the adapter board ADP-R8. 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 J601 shorted by jumper socket): main UART and auxiliary UART routed
as 4-wire interfaces to the USB two UARTs connector (J600) mounted on the adapter board, with
the on-board / B2B switch (SW401) on the EVB-WL3 board is set to "B2B".
UBX-22018774 - R01
C1-Public
MiniUSB/DB9
On-board/B2B
switch
switch
Cellular Main UART
GNSS UART
(SW403)
(SW401)
VCC jumper
3.8 V
DC/DC
Step - down
(J404)
GNSS switch
GPIO2/3/4
(SW304)
I2C
3:
USB
(Cellular UART + AUX UART)
(J600)
USB / 2-UART converter
Main UART
3-pin
AUX UART
Main UART
(J601)
GNSS UART
VCC jumper
3.8 V
(J102)
1.8 V
LDO
J701
1.8 V
LDO
J702
USB_BOOT
(J200)
Cellular
Native USB
LENA-R8 adapter board
(J700)
Starting up
EVK-R8 - User guide
WiFi
Cellular
Antenna
Antenna
(J502)
(J500)
RSVD
ANT
LENA-R8
Module
VCC
VCC_GNSS
Audio
Codec
VBCKP_GNSS
ANT_GNSS
GNSS
Antenna
(J501)
Page 5 of 20
SIM
card holder
(J300)
Cellular
Reset
(SW303)
Cellular
Power-on
(SW302)
Headset jack
(J303)
EVB-WL3
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