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Original question:

TCAN1057A-Q1: TCAN1057A-Q1 vs TCAN1051-Q1 spec deference

TCAN1057A-Q1: common mode range difference between TCAN1051 and TCAN1057A

Chuqiang Wen
Expert 4560 points
Part Number: TCAN1057A-Q1
Other Parts Discussed in Thread: TCAN1051-Q1,

Hi Expert,

We are helping customer migrate TCAN1051-Q1 to TCAN1057A-Q1. We saw a comparison table as below. There have common mode range difference between these two devices. TCAN1057A-Q1 have the smaller range. My questions are,

  • What is the influence of smaller range of common mode spec for transceiver?
  • If there have >12V common mode voltage case happen on TCAN1057A, does TCAN1057A-Q1 will trigger some protection mechanism? Or does TCAN1057A will be destroyed? 

Thanks!

Ethan Wen

  • +1
    TI__Guru 60242 points

    Ethan,

    The common-mode range is the voltage range where the CAN receiver can interpret CAN communication correctly. In some systems, there are ground offsets between nodes that can shift the CAN frames higher or lower in voltage. If the CAN frame goes outside of -12V or +12V, the device will not be destroyed or damaged, the CAN frame will just not be interpreted correctly. The absolute maximum voltage for CANH and CANL determines the voltage level at which the CANH and CANL pins will be damaged.

    Regards,

    Eric Hackett