EVK-R8 - User guide
UBX-22018774 - R02
EVK-R8 HW
Page 14 of 25
C1-Public
5
EVK-R8 HW
5.1
EVK-R8 block diagram and basic description
shows the main interfaces and internal connections of the EVK-R8 evaluation kit:
SIM
card holder
(J300)
LENA-R8 adapter board
LENA-R8
Module
42
-p
in
D
IL
B
2B
c
onne
ct
or
42
-p
in
D
IL
B
2B
c
onne
ct
or
EVB-WL3
GNSS
module
GNSS adapter board
RF_IN
USB
2-UART
converter
USB
(Cellular Main UART + GNSS UART)
(J501)
RS232
(Cellular Main UART)
(J500)
RS232
UART
converter
Cellular Main UART
GNSS UART
MiniUSB/DB9
switch
(SW403)
On-board/B2B
switch
(SW401)
USB
I2C
DC/DC
Step - down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J404)
LDO
GPIO2/3/4
GNSS switch
(SW304)
Cellular
Native USB
(J700)
Cellular
Antenna
(J500)
USB
(Cellular UART + AUX UART)
(J600)
GNSS
Antenna
(J501)
USB / 2-UART converter
ANT_GNSS
VCC jumper
(J102)
3-pin
(J601)
GNSS UART
Cellular
Reset
(SW303)
Cellular
Power-on
(SW302)
Headset jack
(J303)
Main UART
AUX UART
Main UART
Audio
Codec
WiFi
Antenna
(J502)
RSVD
ANT
3.8 V
LDO
VCC
VCC_GNSS
LDO
VBCKP_GNSS
1.8 V
1.8 V
USB_BOOT
(J200)
J702
J701
Figure 5: Block diagram of EVK-R8
The EVK-R8 is formed by three boards:
•
EVB-WL3 or 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 GNSS adapter board, called ADP-GNSS, contains the u-blox 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)
•
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”.
•
No position (no jumper socket on J601): 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-R8, allowing a connection to an external compatible device with
the on-board / B2B switch (SW401) on the EVB-
WL3 board set to “B2B”
.
