We're developing a functional safety product in accordance with IEC 61508 and ISO 13849.
In our circuit we have a safety-related processor, using an SPI interface to exchange data with a uC non-functional safety.
According with functional safety standards, this SPI communication must be isolated.
By reading ISO 13849-2 (Safety-related parts of control systems), I found some information about opto-isolators (table D.19), which says that optocoupler must be "built in accordance with overvoltage category III according to IEC 60664-1. If a SELV/PELV power supply is used, pollution degree 2 /overvoltage category II applies". But I haven't found any requirements or recommendation to use digital isolators instead.
We have already cataloged ADuM1402 in our database and we desire to use it. Then comes my question: is ADuM140x suitable for functional safety applications? how AD manages the possible faults on digital isolators?
Many thanks in advance!