• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 183 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN65HVD01: Datasheet Question (details of schematics)

Thomas Sullivan41
Prodigy 50 points
Part Number: SN65HVD01

Hello. I am looking for greater detail on Figure 17 found in the SN65HVD01 datasheet, specifically in the Receiver and driver portions of the figure. I'm looking for the values of R1, R2, and R3, the details (part number with specs would be ideal) of the back to back zener diodes as well as the unidirectional zener diode, and the purpose/details of the current source in the receiver schematic. Thank you

  • 0
    TI__Mastermind 25705 points

    Thomas,

    The typical values: R1=180kOhm, R2=30kOhm, R3=40kOhm. The back to back zener diodes represent the internal ESD cells. The unidirectional zener diodes are the internal blocking diode to prevent the reverse current. The current source is used to generate an offset at the input of the receiver, therefore the Vit is shifted down to below zero voltage. By doing this, the transceiver has the fail-safe feature. Please refer to this app note for the details. Please let me know if you have more questions.

    Regards,

    Hao