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ISO6721: Creating a Single Channel Bidirectional Isolator || ISO6721RFB

Shashank K S
Prodigy 30 points
Part Number: ISO6721

Tool/software:

Dear Team,

I need to isolate a one-wire signal from an MCU before feeding it to a sensor. I have shortlisted the following ICs for testing:

  1. ISO1641B (I²C Isolator)

    • This IC provides bidirectional isolation for SDA and unidirectional isolation for SCL.
    • I plan to use the SDA line to isolate my one-wire data signal.

  2. ISO6721RFB (Digital Isolator)

    • Given its cost-effectiveness, I propose an unconventional approach:
    • By connecting the input and output channels together, I aim to create a bidirectional signal path for my one-wire data line.

I understand this approach may not be standard, so I’d appreciate your insights on its feasibility. Additionally, if there are more suitable isolation solutions for one-wire communication in the catalog, I’d welcome any recommendations.

Looking forward to your feedback.

Regards,

Shashank

Electronics Engineer

  • 0
    Guru 298230 points

    1-Wire uses an open-drain signal where an actively-driven low signal can override a weak high signal; this is also how I²C works. The digital isolator will not work for this because driving a signal to two different levels with push/pull outputs will not result in a valid voltage and can damage both devices.