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1.2 EVK-N3 block diagram
Figure 2
shows the main interfaces and internal connections of the EVK-N3 evaluation kit:
Cellular RS232
RS232
(UART)
UART
(J500)
converter
Cellular USB
USB
(UART / UART FT)
UART / UART FT
(J501)
converter
12 V
Main power switch
(J400)
(SW400)
RF
GNSS
module
USB
GNSS adapter board
Figure 2: Block diagram of EVK-N3 for SARA-N3 series modules
The EVK-N3 evaluation kit is formed by three boards:
• The lower one, called EVB-WL3, contains the power supply and other peripherals for the SARA-N3
series cellular module (such as SIM card holder, reset button and power-on button).
• The cellular adapter board, called ADP-N3, contains the SARA-N3 cellular module, the cellular
antenna connector, a 3-pin header with jumper for the digital I/O interfaces (GDI) voltage selection,
a 2-pin header with jumper for VCC and current consumption measurement, and the DIL
connectors (J101 and J102).
• 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 SARA-N3 series pins are available on the dual in-line male board-to-board connectors provided on
the top layer of the cellular adapter board (J101 and J102), which are pin-to-pin compatible to the
connectors on the bottom layer of the adapter board EVB-WL3.
Communication with the SARA-N3 series cellular module is provided through the Cellular RS232 DB9
connector (J500) or the Cellular USB Mini-USB connector (J501), available on the EVB-WL3 board.
The UART interface of the SARA-N3 series cellular module is routed up to both the connectors - J500
and J501. The Mini-USB / DB9 slide switch (SW403) must be set according to the selected connector.
The Cellular USB Mini-USB connector (J501) provides also access to the additional UART interface
for firmware upgrade and tracing of the SARA-N3 series cellular module (see section 1.8).
The lower board (EVB-WL3) is designed also to be used with other u-blox cellular adapter boards. It
contains additional switches, jumpers, connectors, LEDs and parts that may be 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 any additional switch in its
default configuration.
UBX-19004195 - R06
C1-Public
MiniUSB/DB9
On-board/B2B
switch
switch
(SW403)
(SW401)
UART FT switch
(SW510)
VCC jumper
3.8 V
Step - Down
LDO
GNSS switch
GPIO2/3/4
(SW304)
ADP-GNSS
Starting up
selection jumper
UART
(J105)
UART FT
VCC jumper
(J404)
(J155)
I
C
2
SARA-N3 adapter board
EVK-N3 - User guide
GDI voltage
Headset jack
card holder
(J300)
SARA-N3
Reset
module
(SW303)
Power-on
(SW302)
ANT NB
(J106)
ADP-N3
EVB-WL3
Page 5 of 17
(J303)
SIM
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