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3.3.2
On board optional modem
The SBC-C31 board can be equipped with one embedded LTE Cat 4 modem module (optional), type QUECTEL EG25-G.
This optional Modem module supports:
•
LTE-FDD (with receive diversity) B1 / B2 / B3 / B4 / B5 / B7 / B8 / B12 / B13 / B18 / B19 / B20 / B25 / B26 / B28
•
LTE-TDD (with receive diversity) B38 / B39 / B40 / B41
•
UMTS (with receive diversity) B1 / B2 / B4 / B5 / B6 / B8 / B19
•
GSM 850 / 900 / 1800 / 1900MHz
•
GNSS Functionality GPS, GLONASS, Beidou/Compass, Galileo, QZSS
When the modem module is mounted, on-board there are also three U/FL connectors (type HIROSE U.FL-R-SMT1(10) )for external antennas, more specifically:
U.FL connector CN20 for RF Antenna
U.FL connector CN22 for GNSS Antenna (the module is ready for the connection of active antennas)
U.FL connector CN23 for Diversity Antenna
microSIM Card Slot
Pin
Signal
Pin
Signal
1
USIM_PWR
5
GND
2
USIM_RST#
6
---
3
USIM_CLK
7
USIM_DATA
4
---
8
---
UIM_PWR: Power line for the microSIM module. Can be 1.8V or 3.3V, it is supported by the EG25-G module automatically.
3.3.3
On board WiFi + BT module
The SBC-C31 board can be equipped with a Dual band (2.4GHz + 5.0 GHz) WLAN 802.11 a/b/g/n/ac + BT 5.0 combo embedded module, which is AzureWave
Type, p/n AW-CM276NF.
SBC-C31
SBC-C31 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by D.T. - Copyright © 2021 SECO S.p.A.
As a further option, the modem can be paired to the microSIM slot CN19 or to the eSIM onboard.
CN19
Boards equipped with the microSIM slot offer a socket type MOLEX. p/n 78800-0001or
equivalent, with the pinout shown in the table on the left.
Here it is possible to insert the microSIM card provided by any telecommunication operator for the connection
to their network.
UIM_RST#: Reset signal line, sent from EG25-G modem module to the microSIM module.
UIM_DATA: Bidirectional Data line between EG25-G module and the microSIM module.
UIM_CLK: Clock line, output from EG25-G module to the microSIM module.
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