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SN65HVD1781A-Q1: Questions regarding SN65HVD1781A-Q1 DE, RE pin settings

Do-hyun Kim
Intellectual 305 points
Part Number: SN65HVD1781A-Q1

Tool/software:

If you input a HIGH value to the DE pin, you can activate DATA, and if you input a LOW value to the RE pin, you can activate Receive.
According to the data sheet Application Information, there is a way to use the RE pin by fixing it to GND, but there seems to be no way to use the DE side by fixing it to a HIGH value on the VCC side.

Finally, I want to use the DE side by PULL-UP processing to the VCC side and RE side by PULL-DOWN processing to GND, so please check if there is any problem.

  • +1
    Guru 316690 points

    What kind of bus are you using?

    This device is a half-duplex transceiver. When you fix DE high, then the bus pins are always driven by this device, and no other device on the bus will be able to send anything. This is appropriate only for a unidirectional connection (i.e., RS-422).