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Original question:

Need Analog/digital Switch for CAN bus

Switching CAN Bus to electronic circuitry.

Tomer Avrahami
Prodigy 40 points
Other Parts Discussed in Thread: TCAN1051

Hello TI.

 We are looking for analog switch or bus switch that can be implemented with automotive CAN bus circuit design (Protocol 11898-2:2016).

Here some requirements and conditions:

  • In the new protocol the CAN absolute maximum voltage was changed to -3v to 18v (can be caused by shorten CAN signal to battery voltage) when normal operation is 0 to 5v. The required switch should not be damaged or impact the bus under those voltage levels and back to function normally when voltage levels are back to normal.
  • Switch required low ON-Resistance <1 ohm and low capacitance <20pF (or the closest possible solution).
  • Analog switching continuous current at Min 120mA.
  • CAN Bit Rate up to 2M/Bit.
  • The switch should allow bidirectional current flow.

Best Regards,

Tomer.

  • 0
    TI__Guru 74252 points

    Tomer,

    Thanks for bringing this inquiry to E2E and thanks for your patience.

    Are you talking about adding a switch to an already existing CAN bus? Or something to switch CAN signals onto a bus? If it's the latter, you will want to look into our TCAN1042/TCAN1051 devices. These are 8-pin CAN transceivers that will have the protections and work with the data rate you need.

    Regards,