• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 34 subscribers
  • Views 195 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TCAN1462-Q1: TCAN1462-Q1 Maximum Data rate clarification

Manoj Turpati
Intellectual 320 points

Part Number: TCAN1462-Q1

Hello TI experts,

I am considering using the TCAN1462-Q1 CAN-FD transceiver in a design where the CAN-FD data phase needs to run at 8 Mbps. In the datasheet overview, the part is described as supporting “Classical CAN and CAN FD up to 8 Mbps,” but the detail is limited.

Specifically, I am looking for solid technical evidence and clarification on the following points:

  1. Is the 8 Mbps data phase rate supported as a guaranteed, validated capability of the transceiver?

    • Is this part tested and characterized for 8 Mbps across temperature, voltage, and process variation ?

    • Or is the 8 Mbps figure only a nominal maximum rating under ideal conditions?

  2. Does the transceiver fully support 8 Mbps within the ISO 11898-2/CiA 601-4 physical layer specifications?

    • The datasheet mentions compliance with ISO 11898-2:2016 and CiA 601-4 but does not explicitly show timing, slew, or electrical parameters at 8 Mbps.

  3. Are there example test results, validation plots, or application notes demonstrating error rates or signal integrity performance at 8 Mbps?

  4. Are there any recommended network constraints required to achieve reliable 8 Mbps operation?

    • Cable length, node count, termination, stub length, or signal improvement recommendations.

It would be very helpful if someone could point me to specific datasheet sections, app notes, or validation documentation that confirm whether 8 Mbps is practical and robust for this part in real network conditions, as opposed to just being listed as a “max” signaling rate.

Thanks in advance!

Best Regards,

Manoj.

  • 0
    TI__Guru 70607 points

    Hi Manoj,

    1. Under ideal conditions similar to 9.2.2 of the data sheet.

    2. Yes, similar to 1. I.e., the data rate should be limited as conditions or topology complexities increase.

    3 and 4. Unfortunately no additional plots. Please see the below app note further clarifying factors to consider and would recommend section 9.2.2 of the data sheet for stubs as short as possible < 0.3 m (the lower the better) and as minimal as possible < 10 stubs, use 0 ohms series resistors if needed to depopulate nodes, consider split terminations, avoid star topologies, < 5 to 10 m lengths, avoid ground loops, use twisted pair with impedance of around 120 ohms, lower node count of <20 nodes should be achievable while using a strong sampling point margin from the controller, 70 to 80%, thanks.

    Top Design Questions About Isolated CAN Bus Design (Rev. B)

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Intellectual 320 points

    Hello Michael,

    Thank you for the quick response.

    To clarify our specific application: the TCAN1462-Q1 will be used in a point-to-point configuration with only two nodes connected. The bus length between units is approximately 2 meters, with proper 120 Ω termination at both ends and no intermediate stubs.

    Given this minimal bus length, low loading, and controlled topology, can you please confirm whether 8 Mbps CAN FD data phase operation is supported across the temperature range of -40°C to +125°C and specified supply voltage range?

    Specifically, we would like to understand whether 8 Mbps operation under these conditions is considered within the characterized and validated operating capability of the device, assuming good layout and signal integrity practices.

    Thank you for your support.

    Best regards,

    Manoj.

  • 0 in reply to Manoj Turpati
    TI__Guru 70607 points

    Hi Manoj,

    Yes, assuming good layout and signal integrity practices for the 2 node point to point 2 m cable length with proper termination, 8 Mbps operation is within the characterized and validated operating capability across the full automotive temp and supply range as specified in the data sheet's section 6.9 FD timing characteristics for 125 ns I.e, 8 Mbps, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Intellectual 320 points

    Hello Michael,

    Thanks for the confirmation !!

    Best Regards,

    Manoj.

  • 0 in reply to Manoj Turpati
    TI__Guru 70607 points

    Hi Manoj,

    You are welcome.

    Please let us know how it goes and if no additional concerns, you may resolve to help close the thread, thanks.

    Best Regards,

    Michael.