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ISO7741-Q1: ISO7741FBDWR is not transmitted data

MounishPatel Seetha
Intellectual 690 points
Part Number: ISO7741-Q1

Tool/software:

Hi,

I am using ISO7741FBDWR as isolated 1mbps UART. I found that communication is not being transferred to isolated side from MCU.I am attaching my schematics> Please let me know if there is any mistake

Thanks & Regards

Mounish

  • 0
    Guru 288740 points

    The schematic does not show decoupling capacitors.

    The IN pins are inputs, the OUT pins are outputs.  As far as I can see, the MCU_TX signal should go through channel D.

    The idle state of UART signals is high; you should use the isolator without the F suffix.

  • 0
    TI__Genius 12505 points

    Hi Mounish,

    As Clemens stated, there are no decoupling capacitors of 0.1uF present on the VCC pins. We highly recommend these decoupling capacitors as they allow for proper functionality of the device.

    Also, I see that the "F" version of the device is used meaning that the default state is LOW. As Clemens mentioned, the non-F version may be more beneficial for you since the idle UART signal state is HIGH.

    Please Also review the signal Input and outputs. This may be a mistake in the schematic diagram itself but the MCU_TX signal is pointing inwards, so I am not sure if that means it is an input to the isolator or an output that is going to the MCU.

    Regards,
    Aaditya Vittal