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  • Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway
  • Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway
  • Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway
  • JCOM.CAN.QUAD - Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway - Main Board
  • JCOM.CAN.QUAD - Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway - CAN Bus Breakout Board
  • JCOM.CAN.QUAD - Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway - CAN FD Breakout Board

Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway

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Product Description

This product is under current development...

For further information, please feel free to contact us


The JCOM.CAN.QUAD gateway board is a galvanically isolated four-channel CAN-to-USB gateway board that can also control two LIN Bus ports. The board comes with two UART ports, which allow the use of external LIN Bus breakout boards, such as our  Isolated LIN Bus Breakout Board. In addition, we will be able to support RS 232, RS 485, and RS 422, should the need arise.

In support of maximum flexibility, the gateway is based on a modular design, containing the mainboard, one or two CAN Bus daughterboards, and one or two CAN FD daughterboards.

A 16 MB flash memory will be used to store communication parameters and firmware features for stand-alone applications, such as a CAN-to-CAN or CAN-to-CAN FD bridges. All in all, the list of possible applications is long:

  • Dual CAN to USB Gateway
  • Dual CAN FD to USB Gateway
  • Quad CAN to USB Gateway (2 x CAN plus 2 x CAN FD)
  • CAN to LIN Bus Gateway
  • CAN Bridge (Connecting two CAN Bus networks)
  • CAN to CAN FD Converter

Add to all these the RS232, RS485, RS422 capabilities as well as integration of an SAE J1939 protocol stack.

We will also create a free-of-charge CAN Analyzing software, similar to our JCOM1939 Monitor Software. The app will support all four CAN ports.

General Features

  • Virtually OS independent
  • Easily adaptable; just access the COM port
  • Works with PCs, Raspberry Pi, BeagleBone, Teensy, Arduino, and other embedded systems
  • Serial protocol (CAN to USB and vice versa) is well documented
  • C, C# source code available to support customized applications
  • Easy firmware updates through USB programming port
  • Power applied through USB port or external 7 to 36 VDC
  • Operating Range: -40...+85 C

Galvanic Isolation

The reading and controlling of multiple CAN Bus connections bares the risk of creating interferences of unpredictable nature. Consequently, we have decided that all CAN channels should be galvanically isolated, not only on the CAN side but also the power supply for each individual power supply as demonstrated in the above picture.

For more information, see: Galvanically Isolated CAN Bus Transceivers Protect Networks Against Destructive Energy...

Main Board Features

  • LPC1768 MCU
  • 7-36 V power supply
  • ISP and RST jumpers
  • 10-pin JTAG header
  • Flash memory
  • Components for MCU RTC
  • 1x USB native port
  • 1x USB/UART port
  • 6-pin header on UART1 and UART2
  • 8 bit GPIO header
  • Connections for 2x CAN daughter boards, using MCU CAN controllers
  • Connections for 2x CAN FD daughter boards, using MCU SPI controllers
  • Power LED
  • Control of 4x CAN channel LEDs (mounted on daughter boards)
  • Mounting holes for Raspberry Pi (only for mechanical compatibility)
  • RoHS Compliant
  • Industrial Temperature Operating Range (-40 to +85 °C)
  • Size: 5" x 4.4" (127 mm x 112 mm)

CAN & CAN FD Breakout Boards

  • CAN bus connections on 3-position screw terminal block
  • Termination resistor, enabled via pin jumper
  • Power and data galvanic isolation
  • Activity LED, controlled by GPIO
  • RoHS Compliant
  • Industrial Temperature Operating Range (-40 to +85 °C)
  • CAN FD Only - SPI CAN controller MCP2517FD
  • CAN Bus Breakout Board - Size: 1.66" x 1" (42 mm x 25.4 mm)
  • CAN FD Breakout Board - Size: 2" x 1" (50.8 mm x 25.4 mm)

Power Supply

The board can be powered via a 7-36 VDC unregulated source. Power is supplied to the board via a 2-position screw header. 

The board includes a general purpose diode that provides reverse polarity protection. A secondary 3.3 VDC linear regulator is used to power the MCU and associated circuitry. The board can also be powered by 5 VDC supplied through either USB port. Ideal diode circuitry prevents the boards from supplying power over the USB ports.
 

CAN Bus Breakout Board

There are two CAN daughter board interfaces. The electrical connections are made via a 5-pin header (0.1” pin pitch). There are two additional 2-pin headers for mechanical support that have no electrical connections. The daughter board will have male pins installed, allowing the daughter boards to be soldered directly to the main board. Alternatively, female headers can be installed on the main board, allowing daughter boards to be added/removed as needed. The headers are spaced to be incompatible with the CAN FD daughter board. The pinout for the 6-pin header is described below.

CAN Bus Breakout Board - Pinout

CAN FD Breakout Board

There are two CAN FD daughter board interfaces. The electrical connections are made via a 8-pin header (0.1” pin pitch). There are two additional 2-pin headers for mechanical support that have no electrical connections. The daughter board will have male pins installed, allowing the daughter boards to be soldered directly to the main board. Alternatively, female headers can be installed on the main board, allowing daughter boards to be added/removed as needed. The headers are spaced to be incompatible with the CAN Bus daughter board. The pinout for the 8-pin header is described below.

CAN FD Breakout Board - Pinout

All daughter boards have 3-pin terminal blocks for the CAN bus connection (CAN-H, CAN-L, and GND). Each CAN port has an on-board 120Ω (0.5W) termination resistor. This termination resistor can be connected or disconnected via a pin header. The CAN bus signals are overvoltage protected with 24V bidirectional TVS diodes. The following CAN transceivers are used:
 
  • CAN: MCP2551
  • CAN FD: MCP2562FD
The CAN bus connections are galvanically isolated from the main board. This includes an isolated DC/DC converter to power the CAN transceivers and digital isolators to pass the signals across the isolation barrier.The CAN FD daughter board includes the MCP2517FD SPI CAN controller with 40 MHz crystal.All daughter boards include an activity LED (with current limiting resistor) that is controlled by a GPIO pin on the header. The LED is on when the pin is pulled low.
 

USB Programming Port

The USB programming port (for firmware updates) uses the CP2102 USB interface IC. 5 VDC power for the board can be supplied through this port. The USB connector is a Mini B connector.
 

USB Device Port

The USB device port is connected to the native USB interface on the MCU. 5 VDC power for the board can be supplied through this port. The USB connector is a Mini B connector.

Raspberry Pi Compatibility

Galvanically Isolated Quad Channel CAN/CAN-FD to USB Gateway With Raspberry PiWhile not specifically designed for the Raspberry Pi, the Quad-Channel CAN board comes with four mounting holes to accommodate the RPi, thus adding Linux-compatibility. The design similar to our SAE J1939 board as described in SAE J1939 ECU Simulator And Data Monitor for Raspberry Pi. 

Most, if not all, CAN Bus HATs in the marketplace use the RPi's SPI interface, thus limiting the use of other HATS depending on the SPI connection (such as RTCs, Displays, etc.). Our concept is open to expansion, and reading CAN data through the COM port is easy to program (we do deliver C source code to demonstrate the reading and writing of CAN Bus data).

With the support of several gateway boards, the Raspberry Pi could maintain a total of 16 CAN ports, using the onboard four USB interfaces.

Furthermore, the gateway board will be able to power the RPi as well, meaning your RPi design can take advantage of the extended input power range.

Additional Information

As of September 24, 2020, the PCB design has been finished and prototypes are in the making.

For further information, please feel free to contact us.  

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