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ISO7760-Q1:

Shaun Thirukonda
Prodigy 30 points
Part Number: ISO7760-Q1
Other Parts Discussed in Thread: TVS0500, TPS25947,

Hi,

Please refer to attached drawing 

I am designing a MCU board which will communicate with a daughter board to get sensor data.

Some data lines are connected between MCU and daughter board

One analog voltage from daughter board to MCU board

I have selected few components which I feel will do the job.

Before ordering, I wish to get a recommendation or suggestion on my selection and make sure that I have selected the right components.

please refer to the image, I am looking for answers, if someone could share their views.

 

Regards

Shaun

  • 0
    TI__Genius 12965 points

    Hi Shaun,

    Thank you for your question and welcome to E2E! 

    1. For the best support it will be better to create a separate post for each part number.
      1. TVS0500 please post here and make sure to include part number in the part number field: (+) Interface forum - Interface - TI E2E support forums
      2. TPS25947 please post here and make sure to include part number in the part number field: (+) Power management forum - Power management - TI E2E support forums
    2. Since the pins are expose transients are expected on the pins. Based on your applications requirement you may have to protect the components against EMC.
    3. Please confirm that the ISO7760-Q1 is connecting to a device with TTL or CMOS logic. If it is, then a digital isolator is correct. Since pins are exposed follow the suggestion in point number 2.
    4. On TI's solution page (Isolation | TI.com) refer to In the Isolated ADCs and Amplifiers section and you will find TI's solutions for isolated analog signals.

    I also wanted to check how do you plan on generating isolated power for the digital isolator?

    I hope this helps.

    Best,

    Andrew  

  • 0 in reply to Andrew Jackiw
    Prodigy 30 points

    Thanks Andrew for your reply.

    I will be using LDO's for different low voltages.

    As per the specs of ISO7760-Q1, it has built in ESD protection

    "Robust Electromagnetic Compatibility (EMC): – System-level ESD, EFT, and surge immunity – ±8 kV IEC 61000-4-2 Contact discharge protection across isolation barrier – Low emissions..."

    Does the outputs which will be connected to an external cable (short length) still need further ESD protection diodes? or it is for optional additional protection?

    Regards

    Shaun

  • 0 in reply to Shaun Thirukonda
    TI__Genius 12965 points

    Shaun,

    Shaun Thirukonda said:
    I will be using LDO's for different low voltages.

    ISO7760-Q1 is a digital isolator which has two sides that are isolated from each other. Each side needs to have a power supply that are isolated from each other as well. If the power supplies are not isolated then isolation will not be maintained.

    Shaun Thirukonda said:
    Does the outputs which will be connected to an external cable (short length) still need further ESD protection diodes? or it is for optional additional protection?

    The I/Os on the ISO7760-Q1 are logic I/Os that are rated up to 5.5V and are only for use on the PCB. These I/Os are not expected to see any EMC transients and therefore have no EMC protections. Hence we do not recommend connecting them external to the PCB, if you need external connections please include the proper protection components in your design.

    "±8 kV IEC 61000-4-2 Contact discharge protection" is referring to discharge protection across the isolation barrier, and not for the logic I/O pins.

    Best,

    Andrew

  • +1 in reply to Andrew Jackiw
    Prodigy 30 points

    Hi Andrew,

    Yes, it makes sense, I fully agree with you.

    Thanks for your support.

    Regards

    Shaun