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TCAN1044A-Q1: Please check the detailed specification of TCAN1044A-Q1.

Chase Jeong
Mastermind 9500 points

Part Number: TCAN1044A-Q1

Dear TI experts,

My customer want to check the specification of TCAN1044A-Q1 below due to end custoer's request.

I tried to find it in datasheet but I couldn't. Can you help me?

  1. Slew rate of differential output
  2. Nominal BIT time
  3. Deviation of BIT time
  4. Voltage deviation between CANH and CANL

And I have one more question.

Below table is about differential input voltage range in case of normal/standby and dominant/recessive mode.

image.png

But end customer's specification is little different.

Vdom -> min 0.9V, max 8.0V (datasheet shows 9.0V)

Vrec -> min -3V (datasheet shows -4V), max 0.5V

Vdom_stb -> min 1.15V max 8.0V (datasheet shows 9.0V)

Vrec_stb -> min -3V (datasheet shows -4V), max 0.4V

In conclusion, max voltage of Vdom and min voltage of Vrec ard exceeded compared to end customer's specification.

What would be happened if these specicications are exceeded? Can TI guarantee these specifications are not affected to device's operation?

Please check these issues. Thanks.

Best regards,

Chase

  • 0
    TI__Guru* 77452 points

    Hi Chase,

    1. CAN physical layer do not specify a fixed dv / dt as it depends on facts that are flexible for the system environment such as bus load, termination, cable, dominant current etc

    2 and 3. This should not be a transceiver parameter and would recommend checking with the controller / MCU team.

    4. See the specified VOD, receiver thresholds  (VIT, VDOM, VREC) and common mode limits.

    Note that the values are functional detection ranges and not the absolute electrical limits I.e., they describe voltage ranges that guarantee the device will interpret dominant vs recessive levels correctly and do not mean the device will be damaged or the bus cannot temporarily exceed the values. Hence, our spec includes margin in addition to OEM specs to allow for robustness.

    If OEM spec is exceeded while still within the data sheet's spec, the device will still operate as guaranteed by TI, receiver will detect dominant / recessive levels as expected without any risk and exceeding the data sheet limits would imply behavior will not be guaranteed, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Mastermind 9500 points

    Dear Michael,

    Thank you for your support.

    About Question 1, Do you have any test results under the condition of termination resistor=60ohm and capacitor value is 50pF?

    Other conditions do not matter, my customer just want to check the reference value under ideal situation like EVM.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru* 77452 points

    Hi Chase,

    Unfortunately, we do not as there seems to be no slew rate requirement and unsure why customer is concerned. I.e., not a CAN requirement / standard and 50 pF is well below the 100 pF used for all CAN characterizations specified in the data sheet, thanks.

    Best Regards,

    Michael.