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Digital isolator for functional safety applications

Francisco Oliveira
Prodigy 60 points
Other Parts Discussed in Thread: ISO721

By reading ISO 13849-2, I found in table D.19 requirements suitable for optocouplers. However both ISO 13849 and IEC 61508 do not mention requirements for any other digital isolator. In my project I would like to use a gavanic isolator like ISO721 or similar, to isolate a SPI interface between a safety uC and another regular uC. 

For optocouplers, the standards require that the device must be built in accordance with overvoltage category III and polution degree 2, as described in IEC 60664-1. Does it applies for galvanic isolators too? is that possible to use ISO721 or similar in safety applications?

Thanks in advance.

  • 0
    TI__Genius 11815 points

    Digital isolators are tested to the same standards that were originally written for opto-couplers. For example, digital isolators are certified to UL 1577, IEC 60747-5-x, CSA CA5A. There are efforts underway to publish standards written specifically for digital isolators, such as IEC 60747-17.

    ISO721 has been certified by UL, VDE and CSA. VDE and CSA certifications were performed for pollution degree 2 and overvoltage category II. Specific details can be found in the certification reports which are available on our website.