This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1042V-Q1: StanbyMode in parallel connection of TCAN1042V-Q1

Part Number: TCAN1042V-Q1

Dear Sirs,

My customer asked us about StanbyMode in parallel connection of TCAN1042V-Q1.

They are using CAN BUS in parallel connection
One is a BUS using TCAN 1042 V-Q 1, and the other is using another device
So the condition is TCAN 1042V-Q1 as StanbyMode and the other Bus is communication status.
In that case, is there any impact on the other Bus?

When I asked the other day, I got an answer that StanbyMode is defined as 0V.
My customers are concerned that the communication side will be affected under the conditions of parallel connection and 2.5 V at Ressesive during communication and 0 V at Stnaby Mode.

Best Regards,

Y.hasebe

  • Hello Hasebe-san,

    When the transceiver is in normal mode, the recessive level is weakly biased (via about 25 kOhm on each line) to VCC/2. When in standby mode, the bus is weakly biased (via the same resistances) to 0 V. If a transceiver in standby mode is connected to an active bus, then, it will lower the recessive level to something between VCC/2 and 0 V (depending on how many active transceivers are connected versus how many standby transceivers). This will not impair CAN communication, though, since the differential signal levels for dominant and recessive states will still be the same. These differential voltages are what the CAN receiver uses to determine the correct logic state of the bus, so the single-ended (ground-referenced) voltages on each line are not critical. (In fact, standard CAN transceivers are designed to detect dominant and recessive states properly as long as the input voltages remain within a +/- 12-V common-mode range.)

    Max
  • Hello Max-san,

    Thank you for your quick and kindly reply.
    I understand your comments.

    I will tell my customer about these comments.

    Best Regards,
    Y.Hasebe