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ISO1050: Design Guide

Brian Wang0928
Genius 14210 points
Part Number: ISO1050
Other Parts Discussed in Thread: ISO1044, ISO1042

Team,

Could you offer the design recommendation on the circuit and layout if customer need to design a multiple nodes with CAN transceiver?

What we need to be careful on the designs for that? thanks. 

Regards

Brian W

  • 0
    TI__Guru 55815 points

    Hi Brian,

    Thanks for reaching out. Like most isolated CAN transceivers, ISO1050 doesn't require many external components for it to be interfaced to a CAN network with multiple nodes. All it requires is the recommended decoupling capacitors on its input and and output power supply pins. The termination is a requirement from the whole CAN network point of view and that needs to be taken care accordingly. Since, there are primarily just two decoupling capacitors needed for the device to be operating normal, even the layout guidelines are fairly simple. The decaps need to be placed as close as possible to device VCC/GND pins. All these are described in the datasheet.

    The need for additional protection on the CAN bus arises based on the end application EMC requirements. Please refer to the below TI design for recommended external components needed for meeting specified protection levels on the CAN bus. The design includes example schematic and PCB layout as well.

    https://www.ti.com/tool/TIDA-00629

    Additionally, please do also refer to the below application note that specifically discusses about ISIO1050 CAN bus protection needs and also details on how to choose a TVS diode.

    https://www.ti.com/lit/pdf/slla419

    As you might already be aware, ISO1050 is one of our older CAN device. We now have newer, more robust, reinforced CAN transceiver, ISO1042. If only basic isolation is sufficient then ISO1044 can be considered. We recommend customer to choose the newer parts that are more robust and are much better in performance compared to ISO1050. Let me know if you have any questions, thanks.


    Regards,
    Koteshwar Rao