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ISOW1412: Not receiving data on ISOW1412BDFMR

Kartikey Yendhe
Prodigy 10 points
Part Number: ISOW1412

Tool/software:

Hello Team,

We are using ISOW1412BDFMR to Isolate our system from the other system for MODBUS communication. We are providing +3.3volt at pin.No-1 (Vio) and +5-volt at pin no-9 (Vdd) but we are not getting any output at pin no-19 (B) and pin no-20 (A).
Now we did another configuration We are providing +3.3volt at pin.No-1 (Vio) and +3.3-volt at pin no-9 (Vdd) but we are getting output at pin no-19 (B) and pin no-20 (A), now according to datasheet the it should work on the following configuration +3.3volt at pin.No-1 (Vio) and +5-volt at pin no-9 (Vdd) but it is not working. Please help us in this problem.
Thanks for your consideration.

Kartikey Yendhe
Dutt Adtech Pvt. Ltd.

  • 0
    TI__Expert 7325 points

    Hi Kartikey,

    Thanks for reaching out.

    Can you please share a schematic with exact connections for us to review.

    Kartikey Yendhe said:
    We are providing +3.3volt at pin.No-1 (Vio) and +5-volt at pin no-9 (Vdd) but we are not getting any output at pin no-19 (B) and pin no-20 (A).

    Can you check what is the voltage at Pin11-12 in this scenario.

    Regards
    Varun

  • 0 in reply to Varun Kumar
    Prodigy 10 points

    Here is the schematic.

  • +1 in reply to Kartikey Yendhe
    TI__Expert 7325 points

    Hi Karthikey,

    Thanks for the inputs. Looks like you want VDD=5V, VISOOUT=5V operation, since MODE=HIGH. Making VISOIN also 5V.

    Please find my inputs below:

    1. The Supply Decaps at VDD is not at all enough for desired 5V operation. 10uF+1uF+0.01uF are needed at both VDD and VISOOUT.
    2. VISOIN and VISOOUT can not have shared decaps since placement of these decaps need to be near both the pins.
    3. Also, it is better to keep EN pin HIGH since in a noisy environment, the EN pin couple noise and go below UVLO and compromise power delivery to VISOOUT.

    Please improve the decaps as per the datasheet and try again for 5V VDD.

    Regards
    Varun