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TCAN1043G-Q1: RXD pull-up resistor

JIE LIU
Prodigy 90 points
Part Number: TCAN1043G-Q1
Other Parts Discussed in Thread: TLIN1021A-Q1,

Tool/software:

Hi TEAM,

Does the RXD pin of TCAN1043G-Q1 chip need to be connected with an external pull-up resistor? Does the RXD pin of the TLIN1021A-Q1 chip need an external pull-up resistor?

Hope to receive your reply, thank you!

  • +1
    TI__Mastermind 30620 points

    Hi Jie,

    The RXD on TCAN1043G-Q1 does not need external pull-up, the structure is push-pull. RXD on TLIN1021A-Q1 is open-drain so external pull-up is needed if  the microcontroller's pin does not have an integrated pull-up.

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Prodigy 90 points

    Hi Sean，

    Why is CAN's RXD designed for push-pull output and LIN's RXD designed for open-drain output?

    Regards,

    Jie

  • 0 in reply to JIE LIU
    TI__Mastermind 30620 points

    Hi Jie,

    The open-drain output allows our LIN transceivers to be used with 3.3-V and 5-V controllers, so there is no VIO pin needed like CAN transceivers. You would need to use the V-variant device on CAN for 3.3V level shifting.

    And CAN has much higher data rate than LIN, push-pull allows for higher data rates due to having an output transistor.

    Regards,

    Sean