Evk-L4 Block Diagram - Ublox EVK-L4 User Manual

1.2 EVK-L4 block diagram

Figure 2 shows the main interfaces and internal connections of the EVK-L4 evaluation kit:
12 V Main power switch
(J400) (SW400)
Cellular RS232 RS232
(UART0) UART0
(J500) converter
Cellular USB USB
(UART0 / UARTx) UART0 / UARTx
(J501) converter
RF LDO
GNSS
module
USB
GNSS adapter board
Figure 2: Block diagram of EVK-L4 for TOBY-L4 modules
The EVK-L4 is formed by three boards:

The lower one, called EVB-WL3, contains the power supply and other peripherals for the TOBY-L4 series
cellular module (as SIM card holder, Headset jack, Reset button and Power-on button).

The cellular adapter board, called ADP-L4, contains the TOBY-L4 cellular module, the cellular antenna
connectors, the USB connector, the Ethernet RJ45 connector, and the MicroSD connector for the cellular
module, and it also contains the u-blox ELLA-W1 series Wi-Fi module and the Wi-Fi antenna connector.

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 (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 only partially described in Figure 1 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.
UBX-17013792 - R01
VCC jumper
3.8 V
Step - Down
(J404)
MiniUSB/DB9 On-Board/B2B
switch switch
(SW403) (SW401)
UARTx switch
UARTx
(SW510)
3.8 V
GNSS switch
GPIO2/3/4
(SW304)
ETH
RJ45
VCC
(J305)
ETH
RGMII
PHY
UART0
J107
UART1
J108
UART2
J109
UART3
ANT1
I 2 C
(J105)
TOBY-L4 adapter board
EVK-L4 - User Guide
Native
MicroSD
USB
(J302)
(J102)
USB 2.0/3.0
eMMC
Analog Audio
MIC1 / SPK
TOBY-L4
Cellular
module
ELLA-W1
Wi-Fi
module
ANT2 ANT WL
(J104) (J303)
SIM
card holder
(J300)
Headset jack
(J303)
Reset
(SW303)
Power-on
(SW302)
EVB-WL3
Starting up
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