Ublox EVK-L2 Series, User Manual

Page: 6 / 27

EVK-L2 - User guide
UBX-14000422 - R11 Starting up Page 6 of 27
C1-Public
1.2 EVK-L2 block diagram
Figure 2 shows the main interfaces and internal connections of the EVK-L2 evaluation kit:
SIM
card holder
(J300)
Reset
(SW303)
Power-on
(SW302)
TOBY-L2 adapter board
TOBY-L2
Cellular
module
42
-p
in
D
IL
B
2B
c
onne
ct
or
(J
20
0)
42
-p
in
D
IL
B
2B
c
onne
ct
or
(J
20
1)
EVB-WL3
GNSS
module
GNSS adapter board
RF
USB
UART
converter
Cellular USB
(UART)
(J501)
Cellular RS232
(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
(J100)
ANT1
(J102)
ANT2
(J103)
ELLA-W1
Wi-Fi
module
ANT WL
(J400)
Audio
Codec
Figure 2: Block diagram of EVK-L2 for TOBY-L2 modules
The EVK-L2 is formed by three boards:
• The lower one, called EVB-WL3, contains the power supply and other peripherals for the TOBY-L2
series cellular module (SIM card holder, Reset button and Power-on button).
• The cellular adapter board, called ADP-L2, contains the TOBY-L2 series cellular module, the
cellular antenna connectors, and the USB connector for the cellular module. It also contains the
u-blox ELLA-W1 series Wi-Fi module and the Wi-Fi antenna connector (except for the EVK-L24),
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 boards 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.
The USB interface of the cellular module is available on the native USB connector on the cellular
adapter board, while the other peripherals are available on the Dual-In-Line male Board-to-Board
connectors provided on the top layer of the cellular Adapter Board (J300 / J301 or J200 / J201), which
are pin-to-pin compatible to the connectors on the bottom layer of the adapter board.
The lower board (EVB-WL3) is designed to also be used with other u-blox cellular adapter boards. It
contains additional switches, jumpers, connectors, LEDs and parts that are partially described in
Figure 1 , Figure 2 or 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 to leave any
additional switch in its default configuration.