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TCAN1042GV-Q1: Question about RXD logic output current

Zhengquan Lu
Intellectual 1035 points
Part Number: TCAN1042GV-Q1

Hi Team,

For TCAN1042GVDRBRQ1, my customer want to know the corresponding application scenarios when they use RXD logic output current  in recommended operating condition(±2mA) and absolute maximum rating(±8mA). What parameters or conditions should be taken care?

Thanks a lot!

  • 0
    TI__Guru 74282 points
    Zhengquan,

    In a typical application, this shouldn't be a problem because the RXD pin will be connected to an MCU/controller, which won't source more than the TCAN1042 can safely deliver unless there's some sort of fault. Series resistors can be placed on the RXD line to force a limit on the current. The current will need to be kept at ~2mA to be able to drive the correct voltage levels to be interpreted by the MCU/controller though.

    Regards,
  • 0 in reply to Eric Hackett
    TI__Intellectual 1035 points
    Hi Eric,
    Thanks for your explanation. About the TXD pin, customer also wants to know the logic output current. And I don't find it in the datasheet. Please help to provide this parameter. Thanks!

    Best Regards
    Zhengquan Lu
  • 0 in reply to Eric Hackett
    TI__Intellectual 1035 points
    Hi Eric,
    Thanks for your help. If current need to be kept at ~2mA when RXD pin output the logic signal, what is the 8mA spec used for? and if customer wants to use at -5mA~5mA, whether will it cause wrong voltage level or other impact?

    Best Regards
    Zhengquan
  • 0 in reply to Zhengquan Lu
    TI__Guru 74282 points
    Zhengquan,

    For the RXD, the driver's recommended current sinking and sourcing level is recommended to -2mA to +2mA because this is the current where the driver can be guaranteed to drive the correct voltage level. The -8mA to +8mA is the point at which the driver will be damaged. If the customer uses the driver at -5mA and +5mA, it won't be damaged, but the correct voltage level can't be guaranteed.

    The TXD is an input pin and thus there is no output current limit, because it is an input pin. However, in the absolute maximum and recommended ratings tables, there is a voltage limitation on this pin.

    Regards,