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TCAN334: Does TCAN334's TX & RX voltage could support 3.3V & 5V?

Kygo Cheng
Expert 6830 points
Part Number: TCAN334
Other Parts Discussed in Thread: TCAN1044V

Hi Team,

There is a good new that DIN TCAN & TLIN

Does TCAN334's   TX & RX voltage could support 3.3V & 5V?

If not! Could you recommend suitable solution to me? THX

  • +1
    TI__Guru 60222 points

    Kygo,

    Since the logic pins of the TCAN334 have an absolute maximum rating of 5V, there is risk that 5V logic would damage the device. Does it need to be a 3.3V CAN bus? Or can 5V CAN bus transceivers work?

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    TI__Expert 6830 points

    Hi Eric,

    Customer situation is as follow 

     

    Current

    Future

    MCU

    5V

    3.3V

    LIN/CAN Tx

    5V

    ??

    Sensor

    9V

    9V

     

    Customer wish all Tx can work on 3.3V, 

    Could you recommend suitable solution to me? THX

  • 0 in reply to Kygo Cheng
    TI__Mastermind 48135 points

    Hi Kygo,

    Our 5V CAN devices with a 'V' suffix such as TCAN1042V and TCAN1044V support logic-level translation to a seperate IO voltage. This makes them compatible with both 3.3V and 5V logic while being powered from a 5V rail for the CAN transceiver. 

    Does this sound like what the customer is looking for?

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Expert 6830 points

    Hi Eric,

    Currently customer’s MCU is 5V,and have used the competitor's IC!

    So if I want  customers can replace TCAN with ours now , I need to recommend a LIN/CAN Tx which can work on 5V,

    But in the future the MCU will be replaced by 3.3V! And customer does not want to replace the IC in the future, if we have an IC that can meet his two requirements "Tx can work on 3.3V & 5V, "! 

    We will DIN the case ! And the next project will win too!

  • 0 in reply to Kygo Cheng
    TI__Mastermind 48135 points

    Hi Kygo,

    Any of the 'V' devices sound like they'll fit this need. For 5V digital interfaces, Vio can be connected to the 5V rail. When moving to 3.3V, this can be supplied to the Vio pin to allow RXD and TXD to operate at the lower voltage. However, the transceiver itself (TCAN1042V, TCAN1044V) require 5V for the CAN transceiver. Do you know if the 5V rail will remain present after they switch to the 3.3V MCU?

    All of these devices are also compatible with 3.3V input levels for TXD. The threshold for this input, even for 5V devices, is low enough to be compatible here. However, the RXD output on non-'V' 5V devices will output a 5V potential. If the 3.3V MCU pin cannot tolerate this, the 'V' version will help by transiting this output using the Vio pin. 

    We do not offer any devices that can operate with a Vcc of 5V and 3.3V. If the supply voltage for the transceiver needs to change, a different transceiver will need to be used. 

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Expert 6830 points

    Hi Eric,

    Understand 

    Then I will divide it into two systems and recommend it to customers!

    Please help confirm the configuration below is correct ? THX

     

    Current

    Future

    MCU

    5V 

    3.3V

    LIN/CAN Tx

    5V -->   use TCAN1042V/ TLIN1021A

    3.3V-->

    use TCAN334/ TLIN1021A

    Sensor

    9V

    9V

     

  • 0 in reply to Kygo Cheng
    TI__Mastermind 48135 points

    Hi Kygo,

    This is fine. Do you know if the system will continue to have a 5V supply rail available after moving to a 3.3V MCU? If so, TCAN1042V could work for both cases. 

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Expert 6830 points

    Hi Eric,

    Thank you so much for your help & feedback !

     I will discuss this case closely with Customer, and I will give feedback to you if I have any information .