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TCAN1051HGV: Output Slew Rate and Emission Requirements

MattLin
Intellectual 1050 points
Part Number: TCAN1051HGV
Other Parts Discussed in Thread: TCAN1051HV

Hi Team,

I had a few questions regarding the TCAN1051HV or TCAN1051HGV. 

  1. What is the slew rate of the output? 
  2. Are any special measures needed in order to meet emissions and immunity requirements? 

Thanks,

Matt

  • 0
    TI__Guru 62920 points
    Hi Matt,

    Although the slew rate is not specified you can see the total transition time of the differential output when transitioning between recessive and dominant states in the Switching Characteristics table of the datasheet (page 10).

    In terms of RF emissions/immunity, it is generally helpful to use "split" termination as shown in Figure 15 of the datasheet (page 22), to match the lengths of CANH/CANL lines (thus minimizing differential-to-common-mode conversion), and maintain a controlled impedance (nominally 120 Ohms differential) on the PCB trace routing and within the transmission line used. Beyond this, some applications use a common mode choke for further filtering. Note, though, that these devices have been tested to meet most automotive OEM requirements without requiring a choke. (For more information, you may want to reference this paper: www.ti.com/.../slly020.pdf.)

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Intellectual 1050 points

    Hi Max,

    Thank you for your response. Everything looks good, but the link you sent regarding the OEM requirements app note is broken. Can you resend?

    Thanks,
    Matt

  • 0 in reply to MattLin
    TI__Guru 62920 points
    Matt,

    Sorry about that. Let me try again:

    www.ti.com/.../slly020.pdf

    Regards,
    Max