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5
EVK-LEXI-R520 hardware
5.1 EVK-LEXI-R520 block diagram and description
Figure 5
shows the main interfaces and internal connections of the EVK-LEXI-R520 evaluation kit:
Cellular RS232
RS232
(cellular main UART)
UART
(J500)
converter
Cellular USB
USB
(cellular main UART)
UART
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF_IN
GNSS
module
Rx
USB
ADP-GNSS
Figure 5: EVK-LEXI-R520 block diagram
The ADP-LEXI-R520 and ADP-GNSS 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 EVB-WL3.
As illustrated in section
of the cellular module, two options are allowed and can be enabled in a mutually exclusive way.
The USB interface of the cellular module (available for diagnostic purpose only) is available on the
native USB connector (J105) mounted on the cellular adapter board.
Other LEXI-R520 peripherals are available on the dual-in-line male board-to-board connectors
(J103 and J104) provided on the top layer of the cellular adapter board.
The lower board (EVB-WL3) is also designed to be used with other u-blox cellular adapter boards. It
contains additional switches, jumpers, connectors, LEDs and parts that may be only partially
described in this document, because they are intended for use only with other u-blox cellular modules.
It is recommended to leave any additional connector unconnected and any additional switch in its
default configuration.
UBXDOC-686885345-1791 - R02
C1-Public
MINIUSB/DB9
ON-BOARD/B2B
switch
switch
(SW403)
(SW401)
VCC jumper
3.8 V
DC/DC
step - down
(J404)
LDO
GNSS switch
GPIO2
3-pin
Tx
GPIO3
(SW304)
(J104)
I2C
2.1.3
and summarized in
EVK-LEXI-R520 hardware
UART
VCC jumper
(J108)
ADP-LEXI-R520
Table
1, for communication via the UART interfaces
EVK-LEXI-R520 - User guide
Cellular
antenna
(J106)
card holder
(J300)
LEXI-R520
module
(SW303)
Power-on
(SW302)
Cellular
GPS
native
antenna
USB
(J107)
EVB-WL3
(J105)
SIM
Reset
Page 13 of 23
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