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TCAN1042V-Q1: TCAN1042VDRQ1 vs TJA1042T/1J with a SPLIT pin

MIKHAIL SALOV
Expert 6860 points
Part Number: TCAN1042V-Q1

Good day Colleagues,

Could you explain how we handle an absence of the SPLIT pin in our devices like the TCAN1042VDRQ1? For example for my customer it's a must to have the SPLIT pin like the TJA1042T/1J does.

Customer is very interested how we handle a common-mode stabilization output if there is no SPLIT pin. Do we plan to create CAN with the SPLIT pin?

Thank you, Mike

  • 0
    TI__Guru 62920 points
    Hello Mikhail,

    Common mode stabilization via a SPLIT pin is usually intended to improve RF emissions by keeping the common mode voltage (average of CANH and CANL) constant even as the transceiver toggles between states. TCAN1042 was designed to have very close matching between the two halves of the differential bus, meaning that CANH and CANL remain symmetrical and the common mode component remains constant. This gives the device excellent RF emissions performance even without a SPLIT pin connection.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 6860 points

    Goof day Max,

    Thank you for answer!

    Could you also tell me, my customer is also saying, the SPLIT pin is used to make a recessive state of CAN bus and usually offsets the bus to Vdd/2 (i.e. half of supply voltage) for this state. Customer is interested in this mode/state rather than EMI improvements.

    How it works for our TCAN1042 family of devices?

    Thank you, Mike

  • 0 in reply to MIKHAIL SALOV
    TI__Guru 74252 points

    Mikhail,

    Typically, the SPLIT output is used to supplement the recessive level that is set by internal biasing. Again, this is to help stabilize the recessive level for any noise that might be injected into the system or emitted. 

    On the TCAN1042, this internal biasing also exists, and this in combination with the termination resistance helps bring the bus to a recessive level.

    Regards,