• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 2 answers
  • Subscribers 35 subscribers
  • Views 492 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

THVD1406: THVD1406DR

Yehoram har even
Prodigy 80 points
Part Number: THVD1406


TI support hello

i am working with the THVD1406DR and have a question.

first when i look at SN65HVD7 data sheet I can see that: DE pin enable the D pin and RE enable the R pin.

not clear (THVD1406DR) how I can operate the transceiver and receiver ( not at the same time) when SHDN control both function.

can you assist?

Yehoram

  • 0
    Guru 318460 points

    This is designed for protocols like UART where the signal is high when idle.

    When there is some activity (low level) on the D signal, the transceiver is in transmit mode. Some time after D has gone idle, the transceiver switches back into receive mode.

  • 0
    TI__Guru 52952 points

    Hi Yehoram,

    Please see functional description from datasheet below:

    This device is auto-direction control RS-485 device - which means that the direction of data transfer is controlled by the state of the "D" pin when /SHDN and /RE are both tied to high logic levels. The logic is shown above in the truth tables - this type of part is meant for UART like applications where we have a fixed frame length to help reduce GPIO usage by having the datastream control whether or not the device is in TX or RX mode. If you want a standard RS-485 - most devices don't have auto-control and I wouldn't suggest this device.  

    Please let me know if you have any other questions.

    Best,

    Parker Dodson