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ISO1500: Only receiving use

MUKKE SANDEEP
Prodigy 180 points
Part Number: ISO1500

Dear sir,

In my application i'm using ISO1500 only for receiving not for transmitting......

So can you pls give the schematic model for only receving

1) How to connect RE pin from controller to ISO1500

2) How to terminate these pins D, DE when transmitting not used

  • 0
    Guru 290750 points

    The RE pin must be low when you want to receive data. If you always want to be able to receive, connect it to GND1.

    Connect DE to GND1 to disable the driver. Connect D to eigher VCC1 or GND1.

  • 0 in reply to Clemens Ladisch
    Prodigy 180 points

    Dear sir,

    Thank you...

    One more thing, In EVM of ISO1500, they connected RE bar pin with 50ohm resistor to GND1.......

    In my application i'm using RE bar connected from Controller side to ISO1500 side...So can i directly connect the GPIO of controller to RE bar pin of ISO1500.....

  • 0 in reply to MUKKE SANDEEP
    TI__Guru 51215 points

    Hi Mukke,

    Yes, the RE/ pin is designed to be driven directly from a controller's output pin so no series resistance is required. Some designs will include a small series resistance (~10-ohms) to signal and control lines to reduce the current through - and therefore emissions from - these lines.

    In cases where an input pin is tied directly high or low, a resistor is commonly used to reduce the power consumed by the pin. ISO1500's RE/ pin defaults to a high state due to a weak internal pull-up resistor. In the EVM, a series resistance was used when pulling the pin low externally to limit the current from the internal pull-up through. This practice is not required and the pins can be safely tied directly to their desired state. 

    Let me know if you have any more questions.

    Regards,
    Eric