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Product Variants
Model
SOM-352
V2X mPCIe System-On-Module, 0B2
C-V2X mPCIe System-On-Module, V2Xcast
SOM-352EC
0B2
DSRC-V2X mPCIe System-On-Module, V2Xcast
SOM-352ED
stack, 0B2
SOM-352UC
C-V2X mPCIe System-On-Module, V2Xcast
DSRC-V2X mPCIe System-On-Module, V2Xcast
SOM-352UD
0B2
Reviewers
Department
Name
PD
Nidor Huang
RD
P.C. Kang
Marketing
Bonnie Wang
Modification History
Revision
Date
0.1
2021/08/19
0.2
2021/10/13
0.3
2021/11/15
0.4
2022/04/15
A printed version of this document is an uncontrolled copy
© 2025 Unex Technology Corporation – Company Confidential
Quick Start Guide
for
SOM-352 Family
Description
Acceptance Date
2025/05/22
2025/05/22
2025/05/22
Originator
Nidor Huang
Creating document
Adding product variants
Adding limited warranty policies, safety guidelines
and product appearance
Nidor Huang
Adding reset and 1PPS guidelines
Adding software settings
Rearranging chapter order
Changing document type from HDG to QSG
Updating J1.1 description
Nidor Huang
Adding antenna cable extraction instructions
Adding troubleshooting
Nidor Huang
Adding GNSS antenna detection mechanism
Doc. No: Unex-QSG-21-003
Document Number
Revision
Authors
®
- Europe ETSI C-V2X stack,
®
- Europe ETSI ITS-G5
®
- US C-V2X stack, 0B2
- US DSRC/WAVE stack,
®
Note
Comment
Unex-QSG-21-003
2.3
Nidor Huang
1/38
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Related Manuals for Unex SOM-352
Summary of Contents for Unex SOM-352
- Page 1 Updating J1.1 description 2021/11/15 Nidor Huang Adding antenna cable extraction instructions Adding troubleshooting 2022/04/15 Nidor Huang Adding GNSS antenna detection mechanism 1/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential...
- Page 2 Nidor Huang Updating BOOTSTRP timing description Updating product photos Updating Unex logo 2023/03/08 Nidor Huang Adding GNSS reset in Unex BSP interface settings 2023/05/10 Nidor Huang Changing Ethernet over USB protocol to RNDIS Updating functional block diagram 2023/07/10 Nidor Huang...
- Page 3 Updating GNSS antenna detection thresholds config file Adding I/O cable connector J1 photos Updating product photos for 0B2 2025/05/12 Nidor Huang Updating functional block diagram 3/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential...
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Page 4: Table Of Contents
10.10. Tamper Detection (Optional) ................27 10.10.1. Production Mode ................... 28 10.10.1.1. Normal Mode ............... 28 10.10.1.2. Standby Mode ..............28 10.10.2. Test Mode ..................... 28 4/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential... - Page 5 No TX/RX Activities during Over-the-Air Testing ..........34 IST OF IGURES Figure 1: IMU alignment ......................9 Figure 2: SOM-352 series appearance ................... 10 Figure 3: Functional block diagram ..................11 Figure 4: Antenna connectors ....................15 Figure 5: Antenna cable extraction tool ................... 16 Figure 6: V2X antennas EX-55/EX-53 ..................
- Page 6 Doc. No: Unex-QSG-21-003 Table 8: SOM-352 mini PCIe row 0 pinout ................19 Table 9: SOM-352 mini PCIe row 1 pinout ................20 Table 10: I/O cable pinout ......................21 Table 11: DIP Switch Functions ....................23 Table 12: Dimensions and weight .................... 31 Table 13: Unex BSP interface settings ..................
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Page 7: Objective
Customer's sole and exclusive remedy and the entire liability of Unex under this limited warranty will be, at Unex's option, return for repair to Unex's repair center with freight and insurance prepaid or shipment of a replacement within the warranty period or a refund of the purchase price if the hardware is returned to Unex. -
Page 8: Safety Guidelines
Software products. • Products dismantled or opened by unauthorized persons. Please contact a • representative of Unex if you need advanced technical support. Products with an altered and/or damaged serial number. • Loss of data or software. •... -
Page 9: Installation Instructions
Caution To avoid risk of electrical shock, be sure to disconnect the electric power cords while installing / servicing the SOM-352 or the host system. 5.1. IMU-mount Alignment SOM-352 (0B) features an integrated onboard IMU (inertial measurement unit) for DR (dead reckoning) navigation. -
Page 10: Installation Steps
Disconnect the host system from its power supply. Open the host system’s enclosure. Insert the SOM-352 into an empty PCI Express slot. Following the host systems’ instruction to complete the mechanical fastening. If a Molex Pico-Lock I/O cable is necessary for host system integration, connect it to the SOM-352. -
Page 11: Functional Block Diagram
°C Storage Temperature -0.3 5.25 mPCIe 5V Supply Voltage -0.3 mPCIe 3.3 Vaux V2X maximum input level GNSS maximum input level 11/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential... -
Page 12: Recommended Operating Conditions
Power Class3 Target C-V2x minimum output power Power=-30dBm, -28.5 RB allocation=96 Test Point1 Power=-18dBm C-V2X output power tolerance Test Point2 Power=15dBm 12/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential... - Page 13 *12: Duty cycle is calculated in 100ms period. *13: I under Min. = OPEN; I over Max. = SHORT; I between Min/Max. = NORMAL. 13/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential...
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Page 14: Power Consumption
Doc. No: Unex-QSG-21-003 8.3. Power Consumption SOM-352 can be powered in two different ways: dual voltage (5V/3.3 Vaux) from mPCIe or 5V from external cable. The data listed in table 3 and table 4 serve only as a reference for system integrators. The actual conditions will vary depending on firmware version and user applications. -
Page 15: I/O Interfaces
Doc. No: Unex-QSG-21-003 9. I/O Interfaces 9.1. Antenna Connectors The SOM-352 mPCIe module is provided with three 50 Ω RF connectors (see IGURE 4: A NTENNA CONNECTORS two V2X antennas • one GNSS antenna • Receptacle connectors are I-PEX MHF I 20279-001E-03. -
Page 16: V2X Antenna Detection
9.1.1. V2X Antenna Detection The V2X antenna ports has a built-in antenna detection function (see 5). This ABLE 16/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential... -
Page 17: Gnss
Command OPEN 616-1023 V2X0: cat /sys/bus/iio/devices/iio\:device0/in_voltage4_raw NORMAL 410-615 V2X1: cat /sys/bus/iio/devices/iio\:device0/in_voltage5_raw SHORT 0-409 Please note that the EX-55/EX-53 antennas are not included in SOM-352 product package and can be purchased separately. EX-55 Gain: 5dBi Radiation Pattern: Omni-directional Application: Indoor/OBU Connector:... -
Page 18: Table 6: Gnss Antenna Status
OPEN status; if the antenna consumes more than 64 mA, then it is considered as the SHORT status. Anything between 8-64 mA is considered as the NORMAL status. In Unex SDK 1.13.10 or later, the OPEN/SHORT thresholds are saved in a config file , and can be modified according to /etc/unex/conf/ubx_antenna_status.conf... -
Page 19: Mini Pcie Card Pinout
Please note that the I/O directions listed here are on the SOM-352 side. For designing a system board mPCIe interface, the input and output direction must be reversed. -
Page 20: I/O Cable Pinout
Powered by 5V: 115mA (max) 9.3. I/O Cable Pinout The I/O cable can help user to install SOM-352 on an existing mPCIe system board without modifying the system board hardware. Make sure to set the SW1.1 configuration accordingly before the I/O cable is connected. Please see 9.4 DIP S... -
Page 21: Figure 7: I/O Cable Connector J1
Doc. No: Unex-QSG-21-003 Figure 7: I/O cable connector J1 Please note that the pinout listed here is seen from the SOM-352 side. For designing an I/O cable interface on the system board, the input and output direction must be reversed. -
Page 22: Dip Switch
In order to avoid interference and to keep 5V power from damaging your system board, it is important to set the DIP switch to correct positions before connecting the I/O cable. 22/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential... -
Page 23: Design-In Guidelines
It is recommended to keep the 5V supply current no less than 2A (continuous) to • keep RF performance from degradation. If the SOM-352 halts or resets while performing a V2X RF transmission, it is • recommended to add a bulk capacitor on the 5V trace near the mPCIe connector to... -
Page 24: Power Sequence
If 3.3 Vaux is fed before 5V, user should toggle the EX RSTn/PERST# signal after • 5V is supplied. If it is intended to save power when the SOM-352 is not in use, it is suggested to • pull low the EX RSTn/PERST# pin instead of cutting off 5V power. Once the EX RSTn/PERST# pin is pulled low, the SOM-352 will enter standby mode, and the power consumption will reduce to 10mA in about 10 seconds. -
Page 25: Serial Port
Serial Port 10.6. The serial port is typically a secondary interface between the SOM-352 mPCIe module and OEM hardware. The level for SOM-352 UART is 3.3V TTL logic level. Depending on the design of serial port on the OEM hardware, a level translator circuit might be needed to make the system operate properly (e.g., 5V to 3.3V or 1.8V to 3.3V). -
Page 26: Reset
ECOMMENDED OPERATING CONDITIONS External 1PPS pins are exposed in both mPCIe interface pin 49 and I/O cable pin 5. To avoid back powering and latch-up, external 1PPS should be fed to SOM-352 at least 20ms later than SOM-352 power up. -
Page 27: Bootstrp
The tamper detection function will be supported by project base. It is disabled by default. The SOM-352 has to be powered up for the tamper detection function to work. The design and implementation of a backup power source is not in the product scope and should be considered by the user. -
Page 28: Production Mode
Enable standby mode tamper response service API. 10.10.2. Test Mode In test mode, the SOM-352 will not erase the CSP (critical security parameter) material saved in eHSM. Each invocation of the tamper signal increments an internal counter within the eHSM. -
Page 29: Thermal Management
10.11. Thermal Management If performing heavy V2X transmission on SOM-352, it is recommended to add thermal vias and expose bare copper top layer on the system board to help disperse heat. Inserting a soft silicone thermally conductive pad between the system board and SOM-352 could facilitate heat dispersion to the system board more efficiently. -
Page 30: Host Gpio Control
It is recommended to use a mini PCIe connector with 4mm stack height, leaving 1.5mm space between the SOM-352 PCB and the system board. This space can later be filled with silicone thermal conductive pad to help dissipate the heat generated by SOM-352 to the system board PCB. -
Page 31: Component Keep Out Area
Component Keep Out Area 11.1. Maximum height of bottom side components may reach 1.0mm. In order to avoid interference with SOM-352, the system board side component height should be carefully considered according to the datasheet of mPCIe connector selected. 31/38 A printed version of this document is an uncontrolled copy ©... -
Page 32: Software Settings
The following descriptions are applicable for Unex software package only. 12.2.1. Windows 10/11 For verifying the integration of a SOM-352 with a Windows host system, please follow the steps below: Install SOM-352 into a mini PCIe slot on a Windows host computer. -
Page 33: Linux
/etc/network/udhcpd.conf filesystem and can be modified if needed. 12.2.2. Linux For verifying the integration of a SOM-352 with a Linux host system, please follow the steps below: Install SOM-352 into a mini PCIe slot on a Linux host computer. Open terminal on the Linux host. -
Page 34: Troubleshooting
Change the IP setting of that network interface on your host system and leave 192.168.1.1 available for the SOM-352 family RNDIS interface. Change the SOM-352 family RNDIS IP address setting. Please refer to the IP A section in Unex’s documentation, which can... - Page 35 For C-V2X systems: Check GNSS antenna and GNSS health status. C-V2X requires GNSS time synchronization and TSF (Timing synchronization function) synchronization 35/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential...
- Page 36 (i.e., the TSF timer) has ACL_TIME_SYNC_SYNCED been successfully synchronized. 3.1.3 If the SOM-352 comes without Unex’s C-V2X protocol, then use the following commands: 3.1.3.1 Check the GNSS antenna status and fix mode. cat /sys/bus/iio/devices/iio\:device0/in_voltage1_raw For GNSS antenna status, please see...
- Page 37 Doc. No: Unex-QSG-21-003 If it shows , then TSF is synchronized. TSF lock status = locked If the SOM-352 comes with Unex’s C-V2X protocol, stop Unex’s V2X services on both TX and RX nodes before running command. cgen d=/etc/runit/svdir/;svstop(){ [ -e $d$s ] && sv stop $d$s; };for s in v2xcastd ssmed ssmd dot3d gnd;do svstop;done...
- Page 38 Doc. No: Unex-QSG-21-003 Check MAC/PHY statistics on the RX node. cd /usr/bin;cgen freq=5915 run=yq 2>/dev/null 38/38 A printed version of this document is an uncontrolled copy © 2025 Unex Technology Corporation – Company Confidential...
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