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TCAN1042-Q1: Standby Mode and Undervoltage condition of TCAN1042-Q1

yoshiki hasebe
Mastermind 6385 points
Part Number: TCAN1042-Q1

Dear Sirs,

My customer asked us about Standby Mode and Undervoltage condition of TCAN1042-Q1.

In the standby mode (STB = H), the Driven Bus State of "Table 5. Driver Function Table" on the data sheet page 23 is described as "Recessive".


In addition, there are the following description on page 21.

When the bus line is biased to GND, the Driven bus state is "Recessive".
Is this correct?
If this is the case, is there any effect on the Can device (and devices on the same bus) of the other party connected in this state?

I have one more question.
About Table 3 (Data Sheet page 18)

Whichever state the BUS will not interfere with the communication of other devices?

Please let me know  about above questions.

Best Regrads,

Y.Hasebe

  • 0
    TI__Mastermind 20820 points
    Hi Y. Hasebe,

    The ISO11898 spec defines two bus biasing states, bus biasing active and bus biasing inactive. In normal mode the bus biasing is in an active state and and the recessive level is defined as +2.5V on CANh and CANL with 0V differential between them. In low-power mode or STB mode the bus biasing is in the inactive state and the recessive level is defined as 0V for CANH and CANL with 0V differential between them. This is for power saving in the low-power mode.

    None of the modes from table 3 will disturb the communication on the CAN bus. When the device is in an under voltage lockout (UVLO) event the CAN pins are high impedance so to not disturb the CAN bus. When the device is recessive the CAN pins are high impedance and will not disturb the CAN bus.

    I hope this is clear, please let me know what other questions you have?
  • 0 in reply to Michael Peffers
    Mastermind 6385 points

    Hello Michael-san,

    Thank you for your quick reply.

    I understand your comments,

    I will tell this comments to my customer.

    Best Regards,

    Y.Hasebe