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SN65HVD251 - Split termination

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: SN65HVD251

Hi all,

Would you mind if we ask SN65HVD251?

We have some questions about "Split termination" with SN65HVD251.
Could you let know us it?

20150219_SN65HVD251.pdf

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Expert 3045 points

    Hi Hiro,

    i'm out of office now and i will update the answer as soon as i come back, before Sunday.

    Thank you for your patience.

    Best regards and have a nice weekend!

    Vio Liu

  • 0
    TI__Expert 3045 points

    Hi Hirotaka,

    Nice to see you.

    The driver capability of the CAN driver is 50 mA, you are right.

    For the CAN transceiver, the total load can exceed 60 Ohm, it is reasonable if the total load is between 45 Ohm and 65 Ohm. The 1.3 kOhm resistors are optional to slightly avoid the stub reflection. If you use 1.3 kOhm resistors, the number of nodes should be limited by the max load of 45 Ohm. On the other hand, if you want to add more nodes, you can use higher resistor value.

    For the 3rd question, I don't know the exact value of the capacitor on each stub so i can't tell you whether the corner frequency is right or not.

    Thank you for your question!

    Best regards,

    Vio Liu

  • 0 in reply to Vio Liu
    Guru 27585 points

    Liu san,

    Thank you for your reply.

    <For the 3rd question>
    The following document P13 shows the metohd of Low pass filter with Fc, and then,
    if R value decrease we guess that Low pass filter with Fc increases. 
    http://www.ti.com/lit/an/sloa101a/sloa101a.pdf

    Is our recognition correct?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Expert 3045 points
    Hi Hirotaka,

    Yes, the changes of the load resistance will result in a change of the corner frequency. If R decrease, the Fc will increase.

    Best regards,
    Vio Liu