What is the minimum order quantity for prototype PCB assembly?

Prototype and trial-run PCB assembly starts from 1 piece and covers quantities up to around 500 pcs, with a typical lead time of 3–9 days depending on board complexity and component availability.

Which files do I need to send for a PCB assembly project?

Send Gerber files (or ODB++), a complete BOM with manufacturer part numbers, a pick-and-place (centroid) file and assembly drawings. Test instructions or firmware are needed if you require programming or functional testing.

How do you control PCBA quality?

Quality is controlled at every stage: IQC for incoming materials, SPI for solder paste, AOI before and after reflow, 3D AOI, first article inspection (FAI) and functional testing (FCT), all recorded in a Manufacturing Execution System (MES) under an ISO 9001 quality system.

Can you source components from brands like TI, ADI, ST and Microchip?

Yes. The sourcing team has over 10 years of experience procuring parts from brands such as TI, ADI, ST, Microchip, Murata and TE Connectivity (Tyco), and keeps an inventory of common components. Alternative parts are proposed when lead time or cost is a risk.

What certifications does PCB ADEPT hold?

Manufacturing operates under an ISO 9001 quality management system, and PCBs and assemblies can be produced to UL and RoHS (lead-free) requirements.

Do you offer box build and finished product assembly?

Yes. Beyond PCBA, the factory supports plastic enclosure molding, CNC machining, 3D printing, memory and MCU programming, finished product testing, aging, labeling, packaging and international delivery.

Custom OEM ODM Raspberry Pi HAT Wholesale IoT Single Board Computer Expansion Boards China Manufacturer Factory Direct Bulk Supply

1. PCB Installation View

The product PCB measures 265x120 mm, with the top-level interface and component layout arranged as follows:

Raspberry Pi CM5 Carrier Board PCB Top View Layout

Connector	Description	Connector	Description
J1	Board-mounted power connector, DC 5–18V	J6	HDMI 2.0 connector
P1	External DC power supply, DC 5–18V	J9	2*USB Type-A connectors
J2	USB Type-C fast charging, up to 20V	J10	2*USB Type-A connectors
Rpi-CM5	Rpi-CM5 Core Board Connector	CON1	2*DB9 RS232 connector
CON3	WAN (4G/5G) module connector	A1/A4	SMA board external antenna connector
J15	Nano-SIM card connector	A2/A3	IPEX4-G1 board-mounted antenna connector
J4	CR2032 battery connector	SW1	System power switch button + CM5 indicator light
J5	CM5 Fan Connector	D31	WAN module indicator light
J3	Firmware update jumper	D28	User-defined indicator light
J8	6 GB switch Ethernet port	D3	Power supply status indicator light
J7	GB LAN Ethernet Connector

2. Module Installation

2.1 Pre-Installation Notes

Critical Warning: Before installing any modules, ensure the motherboard is completely powered off. This product does not support hot-plugging for module installation.

ESD Prevention: Wear anti-static gloves and never install the device with bare hands to prevent static electricity from damaging the motherboard or module chips.

2.2 Install Rpi-CM5

Installation: Align the Rpi-CM5 module with the installation slot and place it flat. Gently press the module with your hand to ensure it sits properly in place. Avoid applying excessive force or forcing it down, as this may damage the connector or module. For permanent use, secure all four screw holes with M2.5 screws to prevent detachment during operation.

Disassembly: Remove the four fixing screws. Using a plastic pry tool, gently pry one edge not in contact with the connector (preferably the right side as shown in the view, i.e., the position of the fan connector), then lift it slightly upward until the module detaches from the slot; remove the module.

2.3 Install the WAN Module

This product supports standard WWAN modules measuring 30x51mm or 30x42mm, featuring an M.2 B-Key interface with 67 pins and USB 3.0 communication.

The motherboard typically comes pre-installed with 30x51 modules. If users require 30x42mm modules, a 3.0mm-high M3 single-head fastening stud must be added to the board.

The user inserts the module at an angle into the M.2 slot. Once in position, gently press the module against the fixed hole for alignment, then secure it with M2.5 screws (M3 for 30x42 models).

2.4 Install the Antenna

This product features two sets of antennas—one internal and one external. The internal interface uses IPEX-G1, while the external interface employs SMA (internal hole). Users can install the appropriate antenna based on their specific requirements.

(1) Install the CM5 WiFi and Bluetooth antennas: If the CM5 supports WiFi+BT functionality, a corresponding antenna must be installed. The user should purchase an IPEX-G1 to IPEX-G1 conversion antenna, inserting one end into the CM5's IPEX socket and the other end into the A2 or A3 connector on the board.

(2) Install the WAN module antenna: WWAN module antennas typically come in one or more units, but this product supports up to two. The WWAN module connectors are usually IPEX-G4 or IPEX-G1; users must purchase the corresponding adapter cable (IPEX-G4 to IPEX-G1 or IPEX-G1 to IPEX-G1) based on the module's antenna interface, and plug both ends of the adapter into the module's antenna connector and the internal A2 or A3 connector, respectively.

(3) External antenna on the installation panel: The external antenna should be selected based on the user's specific requirements—for example, whether it's a WiFi+BT antenna or a WAN 4G/5G antenna—since their power amplification capabilities differ accordingly. However, the antenna interface must be an SMA internal pin. Insert the antenna into the external antenna connector A1 or A4 and secure it firmly.

2.5 Install the SIM Card

The SIM card is primarily designed to work with a WAN module for mobile communication. The SIM card slot is located at edge J15 on the board. This product only supports Nano-SIM cards.

Insertion: Insert the SIM card chip with its edge facing downward and the notch facing inward into the J15 slot, then gently push it inward until you hear the locking sound.

Removal: The user gently pushes inward with their hand until the unlock sound is heard; the SIM card then pops out and can be removed.

2.6 Install the Real-Time Clock Button Battery

This product provides a 2032 button battery connector (J4) to maintain the real-time clock operation of the Rpi-CM5.

Installation: The user should purchase a 2032 button battery of the appropriate model. Insert the battery according to the spring orientation, push it toward the locking position, and gently press downward until the battery engages with the locking mechanism.

Removal: Gently press the battery with your hand, then use a pliers to pull the retaining tab backward until the battery pops out of the socket; remove it.

Battery Handling Precautions:
• Do not install or remove the battery while the device is powered on.
• Always hold the battery firmly when handling it vertically, and never drop it onto other components to prevent short circuits.
• Before installing or removing any modules, remove the button batteries first.

3. Power Supply and On/Off Operation

3.1 Power Supply Methods

The product supports three versatile power supply methods:

(1) Off-panel DC power supply: The external DC power supply can power the product through the P1 DC socket, supporting voltages of 5–18 V DC, with the plug core serving as the positive terminal and the outer ring as the negative terminal. If the external voltage exceeds 20 V, the system will enter a protection mode and automatically cut off the power supply.

(2) DC power supply within the panel: The J1 on the board is a VH (3.96) connector, providing an in-board DC power supply for interconnection and fully connected to P1. Its functionality and overvoltage protection are identical to those of the external DC power supply. Therefore, users must choose either the external or internal DC power supply method.

(3) USB Type-C Smart Fast-Charging Power Supply: The product supports power supply via J2 USB Type-C, with an input voltage range of 4V to 20V. It is compatible with PD3.2 EPR, AVS, PPS, SPR, and BC1.2 fast charging protocols, and features a built-in overvoltage protection module.

(4) Choice between DC power supply and USB Type-C power supply: The product supports both DC and USB Type-C power supplies simultaneously. The system automatically selects the higher-voltage source to provide power based on the voltage levels.

3.2 Power-on of the System

Before powering on, users should correctly insert all modules, ensure the PCB is installed inside the fixed chassis or placed in a secure position, and verify that no other cables or components that may cause short circuits are present nearby. Connect a DC power source or a USB Type-C power source.

3.3 Power Off System

The user unplugs the external power source, including a DC power supply or a USB Type-C power adapter.

Important Note: When debugging the product and inserting or removing various modules or components—particularly the Rpi-CM5 module—you must first remove the button battery; failure to do so may cause a short circuit, potentially rendering the module nonfunctional.

4. Power On and Off

4.1 Power On

After powering on the system, it will start automatically. When the system is powered on but in the shutdown state, press SW1 once to power it up. After turning on the device, you should normally see the D3 light illuminate.

4.2 Power Off

When the system is operating normally, users should first perform a shutdown operation in the system (e.g., the poweroff command), after which the system will shut down automatically.

Alternatively, users can press the SW1 switch button once; the system will then display shutdown options, allowing them to choose to shut down. Under special circumstances, users can perform a forced shutdown by pressing the SW1 switch button for 3 to 5 seconds. After shutting down, the user can unplug the power supply.

Data Protection Warning: Do not remove or disconnect the power supply while the system is running. This will cause the writing operation to fail, result in data loss, and may even lead to storage system failure and inability to start properly.

5. Burn the Firmware

When your Rpi-CM5 is a brand-new motherboard with no pre-installed system on its internal storage, you must first flash the firmware.

(1) Preparations before burning: This system uses a Windows host; users should first download the required software and prepare a data cable.
• Download and install: rpiboot
• Download and install: Raspberry Pi Imager
• Data cable: A USB Type-A to USB Type-C data cable.

(2) Jumper wire: When the power is off, set the jumper at position J3 to a short-circuit state by fitting the jumper cap.

(3) Insert a DC power supply: Since the USB Type-C bus handles both power supply and data communication, the computer's output power is limited and may not be sufficient to power the Rpi-CM5. Therefore, a DC power supply is recommended.

(4) Connect the USB cable: Insert the Type-C data cable's Type-C port into the product's J2 USB Type-C connector, and connect its Type-A port to the computer. After insertion, a new device named "BCM2712D0 Boot" appears in Device Manager under General Serial Bus Devices.

(5) Create a high-capacity USB storage device: Run the "rpiboot – Mass Storage Gadget" from the rpiboot installation directory to initialize the previously identified USB device as a high-capacity storage device.

(6) Burn the firmware: Run Raspberry Pi Imager, follow the prompts to enter the required information, and flash the firmware. Since flashing the firmware may require a lengthy online download process, users can first download the corresponding firmware from their local image repository and then proceed with local firmware import for flashing. For the specific programming and flashing method, refer to the Raspberry Pi documentation until the process is complete.

(7) Return to normal operating mode: After completing the burning, power off and set the jumper at position J3 to open circuit, or remove the jumper cap. After power restoration, the system will officially operate from the CM5 storage device.

6. Relevant System Configuration

6.1 Features Overview

Features that do not require configuration by default:

(1) Switching Function: By default, the switching chip operates normally once properly powered.

(2) HDMI functionality: Once the system is operating normally, the HDMI function works properly without requiring any additional configuration.

(3) USB-HUB functionality: Once the system is operational, it automatically detects the USB-HUB feature, enabling all four sets of USB Type-A ports to function properly.

Features that require configuration:

(1) LAN port functionality: The Rpi-CM5 cannot automatically recognize the YT6801 chip in this product and requires driver installation.

(2) RS232 port functionality: The Rpi-CM5 does not default enable the corresponding UART function; kernel DTS configuration is required.

(3) GPIOs: The required GPIOs for the system necessitate modifying the kernel DTS or performing corresponding configurations.

6.2 Pre-configuration Preparation

After properly powering on the device, first configure its WiFi function to establish network connectivity—ideally enabling internet access.

Enable the SSH service: sudo systemctl enable ssh

Run the SSH service: sudo systemctl start ssh

6.3 Install the LAN Port Driver

This product's LAN port (J7) employs the YT6801 chip and connects via the PCIe 2.0 interface of the Rpi-CM5 board.

Upon entering the system, using the lspci command reveals the device: "0001:01:00.0 Ethernet Controller: Motorcomm Microelectronics YT6801 Gigabit Ethernet Controller (Rev 01)." This indicates that the YT6801 is connected via a PCIe interface and requires only driver installation.

(1) Copy the driver (yt6801-1.0.31.tar.gz) to the product directory;

(2) Decompress driver: tar xvf yt6801-1.0.31.tar.gz;

(3) Enter the drive directory: cd yt6801-1.0.31

(4) Install the driver: sudo ./install_yt6801-driver

(5) Check for error prompts until installation is complete.

Writing the MAC address: If you need to write the MAC address to the network card, follow these steps:

(1) Enter the yt6801-1.0.31 directory from the previous decompression step;

(2) Check that the Motorcomm_NIC_Burn_Helper program was generated during the previous installation step;

(3) Execution: sudo ./Motorcomm_NIC_Burn_Helper -index 0 -mac "MAC-ADDR"

Parameter declaration:

Index 0: The 0th device. This product has only one device, so it can only be 0.
-mac "MAC-ADDR": Specifies the written MAC address, which can be separated by a hyphen - or colon : symbol.

Caution: A MAC address can only be written once. Use it carefully and ensure you write the correct address.

6.4 Configure DTS Functionality

Modify the /boot-firmware/config.txt file and add the following lines in Section [CM5]:

Add row	Use / Description
`dtoverlay=uart1-pi5 dtparam=uart1=on`	Configure UART1 Open UART1
`dtoverlay=uart2-pi5 dtparam=uart1=on`	Configure UART2 Open UART2
`dtoverlay=spi4-1cs`	SPI configuration
`dtoverlay=gpio-fan`	GPIO Fan control
`dtoverlay=act-led`	Activity LED status
`dtoverlay=gpio-shutdown,gpio_pin=17,active_low=1,gpio_pull=up`	Power monitoring, automatic shutdown
`gpio=0-7=a2`	Configure GPIO 0-7 as the second function group
`gpio=14,15=op,dh`	WWAN AWREN and WWAN WDIS are configured to output a high level.
`gpio=16=op,dl`	The User_LED is configured to output a low level.
`gpio=17-21=ip`	PWR_GOOD, USBPn OC# configured as input
`gpio=22-27=pu gpio=22-27=ip`	The LINK status indicator for switch ports (P1–P6) is set to high. The LINK status indicator for switch ports (P1–P6) is configured as input.

Frequently Asked Questions

Can I hot-plug the Raspberry Pi CM5 or WWAN modules on this board?

No. This motherboard does not support hot-plugging. Always turn off all power sources and remove the CR2032 button battery before inserting or removing the CM5, WWAN modules, or other expansion components to prevent electrical damage.

What power supply inputs are supported, and how does the board select power?

The board supports off-panel DC (P1: 5–18V), in-board DC (J1 VH3.96: 5–18V), and USB Type-C fast charging (J2: 4–20V supporting PD3.2 EPR, PPS, BC1.2). When multiple power sources are connected, the system automatically draws power from the source providing the higher voltage.

How do I put the Rpi-CM5 into firmware flashing mode?

Power off the system and place a jumper cap on position J3 to short-circuit it. Connect a DC power supply and plug a USB Type-C cable from J2 into your host PC. Run rpiboot to initialize mass storage gadget mode, then flash the image using Raspberry Pi Imager. Remove the jumper cap after flashing is complete.

Why does the Gigabit LAN port (J7) require manual driver installation?

The LAN port uses the Motorcomm YT6801 Gigabit Ethernet controller over PCIe 2.0. Because standard Raspberry Pi OS does not include built-in drivers for this chip, you must compile and install the yt6801 driver package manually and configure the MAC address once.

What size WAN modules and SIM cards are compatible?

The board supports standard M.2 B-Key WWAN (4G/5G) modules measuring either 30x51mm or 30x42mm (requires a 3.0mm M3 standoff). The SIM card slot (J15) accepts Nano-SIM cards with push-in locking mechanism.

How do I enable the RS232 interfaces and custom GPIO functions?

RS232 (UART1/UART2) and hardware GPIO pins require modifying the /boot-firmware/config.txt DTS overlay configurations under the [CM5] section, including setting overlays for UART, SPI, fan control, and defined pin input/output directions.

OEM Raspberry Pi HAT: Affordable Mini Single-Board Computer from China Suppliers and Factory for IoT and DIY Projects Suppliers, Companies

Product Description

1. PCB Installation View