EVK-L20, EVK-L21 - User Guide
UBX-14000422 - R03
Early Production Information
Starting up
Page 5 of 17
1.2
EVK-L2x block diagram
Figure 2 shows the main interfaces and internal connections of the EVK-L2x:
SIM
card holder
(J300)
Step - Down
Main power switch
(SW400)
12 V
(J400)
Reset
(SW303)
Power-on
(SW302)
3.8 V
Native USB
(J100)
TOBY-L2 Adapter Board
TOBY-L2
module
42
-pin
DIL
B2B connector (J300)
42
-pin
DIL
B2B connector (J301)
ANT1
(J104)
ANT2
(J103)
EVB-WL3
GNSS
module
GNSS Adapter Board
RF
VCC jumper
(J404)
Figure 2: EVK-L2x block diagram
The EVK-L2x 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-L200 or ADP-L210, contains the TOBY-L200 or the TOBY-L210
cellular module, the cellular antenna connectors and the USB connector for the cellular module.
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), 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 not specifically described in Figure 1 or 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.
