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TCAN1042-Q1: Hot plug

Zehui Li
Intellectual 440 points
Part Number: TCAN1042-Q1
Other Parts Discussed in Thread: TCAN1044A-Q1,

Hi，

   Dose tcan1042 support hot plug? By hot plug, I mean two already powered up devices connect CANBUS with cable.

  • 0
    TI__Mastermind 24475 points

    Zehui,

    As long as the voltage levels of the CAN bus are kept within the operating conditions listed in the data sheet, then the device would not expect to receive any damage.

    From a communication protocol perspective, CAN usually does not support interpreting CAN frames mid-frame. In order for proper communication to take place, you would most likely need to implement some sort of hot-plugging software capability. The standard CAN protocol does not support hot-plugging.

    Based on the way your question is worded, I imagine that you are asking about connecting powered devices/nodes, but not necessarily actively communicating nodes. As long as this is the case, then the important consideration would be abiding by the ratings/conditions in the data sheet. The best way to help design for this case would be to provide low-impedance GND connection between different nodes before connecting so that there is less of a risk of large voltage differences between nodes.

    Also, please consider TCAN1044A-Q1 instead of TCAN1042-Q1. The TCAN1044A-Q1 is the newer version of TCAN1042-Q1 created in the latest process technology.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Intellectual 440 points

    Hi Danny,

        According to your reply, if there is no communication it's possible to implement. What about connecting or disconnecting one node which is recessive to a BUS on communication? 

  • +1 in reply to Zehui Li
    TI__Guru 65652 points

    Zehui,

    In that case, you may see some disturbance on the CAN bus due to instantaneously removing a source of impedance, but it should not cause damage or corrupt the CAN bus.

    Regards,

    Eric Hackett