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Original question:

ISO7740: second source

ISO7740-Q1: In Out mismatch

Venkatesh B
Intellectual 783 points
Part Number: ISO7740-Q1
Other Parts Discussed in Thread: ISO7741-Q1, ISO7741

Tool/software:

Hi,

i am using ISO7740DBQR IC for digital isolator purpose

attached the schematc,problem is at INC input GPIO is become High from MCU,but output side OUTC is not changing its state from LOW to HIgh 

IN A & IN B working fine,what could be the reason for  INC not working

thank you

venkatesh 

  • 0
    TI__Genius 17295 points

    Hello,

    Thanks for reaching out and the schematic.

    I noticed that the device in question is the ISO7740F-Q1, which has 4 forward channels. But the image shows a 3 forward channels and 1 reverse channel, which could be ISO7741-Q1.

    Considering this, can you please confirm which device is being used?

    Also, Can you please provide a waveform of the issue you are experiencing?

    Regards,
    Aaditya Vittal

  • 0 in reply to Aaditya V.
    Intellectual 783 points

    Hi 

    updated part number used is ISO7740DBQR and R27 is DNP since only one Enable required for this IC

    Thank you

    venkatesh

  • 0 in reply to Venkatesh B
    TI__Genius 17295 points

    Hi Venkatesh,

    Thank you for your response.

    Venkatesh B said:
    updated part number used is ISO7740DBQR and R27 is DNP since only one Enable required for this IC

    As shown from the schematic you originally sent, this device has 3 forward channels and 1 reverse channel, meaning that this device in the schematic is the ISO7741 device. 

    If the device is supposed to be only 4 forward channels, then please confirm if the schematic and part number is correct.

    As I mentioned before, Do you have any waveforms of INC input and output signals? can you also provide the layout of the device?

    Regards,
    Aaditya Vittal