EVK-L2 - User Guide
UBX-14000422 - R10
Starting up
Page 7 of 30
1.2
EVK-L2 block diagram
Figure 3 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
o
n
n
ec
to
r
(J
30
0)
42
-p
in
D
IL
B
2B
c
o
n
n
ec
to
r
(J
30
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)
I
2
C
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
(J104)
ANT2
(J103)
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
o
n
n
ec
to
r
(J
20
0)
42
-p
in
D
IL
B
2B
c
o
n
n
ec
to
r
(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)
I
2
C
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 3: Block diagram of EVK-L2 for TOBY-L2 product versions "01" (top) and "02" / "62" onwards (bottom)
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, the Wi-Fi antenna connector and an audio codec for product versions "02" / "62" onwards.
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.
