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TCAN1044A-Q1: if NC pin could connect to 3.3V/1.8v

Jessica Wu74
Expert 6270 points

Part Number: TCAN1044A-Q1

Hi team,

Could you please kindly help to confirm if TCAN1044A-Q1 NC pin could connect to 3.3V/1.8V? Since customer want to do a compatible design between TCAN1044A-Q1 and TCAN1044AV-Q1. Thanks a lot for your support to confirm.

Best regards

Jie

  • 0
    TI__Prodigy 205 points

    Hi Jie,

     

    Unfortunately, I do not think you will be able to make a compatible design. The NC pin of the TCAN1044A-Q1 can connect to 3.3 V or 1.8 V since it is not internally connected in the device however there will be issues with the logic-level references. Since the TCAN1044A-Q1 does not use VIO, logic-level pins such as TXD, RXD, and STB will be referenced to VCC. VCC must be connect to a 5-V supply and not a 3.3-V or 1.8-V supply. Therefore, logic-level pins such as TXD, RXD, and STB will not be able to communicate properly with other devices expecting a 3.3-V or 1.8-V signal.

    Is the customer using a TCAN1044 with other devices expecting a 3.3-V or 1.8-V logic-level from it? If so, you will need to use the TCAN1044AV-Q1 or use the TCAN1044A-Q1 with a logic-level shifter which may be more expensive.

    Please let us know if you have any other questions.

     

    Respectfully,

    Brandon Young