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ISO7710-Q1: Output Pulse During Supply Ramp-Up

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Replies: 3

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Part Number: ISO7710-Q1

[ ISO7710-Q1 ] Output Pulse During Supply Ramp-Up

Hi,

My customer has seen the short pulse on OUT pin during power supply ramp-up.
Can you take a look followings and comment on it?

* ISO7710-Q1
* Schematics, see below
* Waveforms, see below
* Other findings: If customer put their probe on IN pin, then output puse disappeared.










Thank you for your support in advance.
Regards,
Ken

  • Hi,

    I did quick waveform analysis. It seems that the ISO7710-Q1 start its default operation under VCC1:VCC2=PD:PU operation.
    In order to prevent this situation, customer need to use ISO7710-Q1 with F suffix or power device up at the same time.



    Please let me know, if you have further comment.
    Thanks,
    Ken

  • In reply to Kenichiro:

    Hi Ken,

    Your understanding is accurate. Based on the application, choosing the right default option device would make it lot more convenient. For most multi-point communication applications, it is desirable to have devices that default the output to HIGH state as soon as device is powered up so that the bus free and available for other nodes to keep communication intact. For such applications default HIGH is a suitable device.

    For applications like motor drives, the default LOW state is desirable so that the motor doesn't rotate erroneously during power up.

    Hence please choose the right device according to your applications. Thank you.


    Regards,
    Koteshwar Rao
  • In reply to Koteshwar Rao:

    Hi Koteshwar,

    Thank you for your prompt reply!
    I will consult with my customer.

    Their application is like LiDAR and ISO7710-Q1 is used for isolation of gate signal.

    Thanks,
    Ken

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