EVK-R6 - User guide

UBX-21035387 - R02

Starting up

Page 5 of 23

C1-Public

1.2 EVK-R6 block diagram and basic description

Figure 2 shows the main interfaces and internal connections of the EVK-R6 evaluation kit:

SIM

card holder

(J300)

Reset

(SW303)

Power-on

(SW302)

LARA-R6

adapter board

(ADP-R6)

LARA-R6

Cellular

module

EVB-WL3

GNSS

module

GNSS adapter board

RF

USB

UART

converter

Cellular USB

(Main UART)

(J501)

Cellular RS232

(Main UART)

(J500)

RS232

UART

converter

UART

MiniUSB/DB9

switch

(SW403)

On-Board/B2B

switch

(SW401)

USB

Headset jack

(J303)

I2C

Step - Down

Main power switch

(SW400)

12 V

(J400)

3.8 V

VCC jumper

(J404)

LDO

GPIO2/3/4

GNSS switch

(SW304)

Native

USB

(J105)

ANT

(J106)

ANT DIV

(J202)

Audio

Codec

Cellular USB

(two UARTs)

(J201)

USB/UART

converter

UARTs

(J248)

VCC jumper

(J109)

Figure 2: Block diagram of EVK-R6 for LARA-R6 modules

The EVK-R6 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, contains the 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 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).

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) as

illustrated in Figure 3:

•

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. 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, allowing a connection to an external compatible device with

the on-board / B2B switch (SW401) on the EVB-WL3 board set to “B2B”.