ISO6421: Level shifting when using digital isolator

Hello,

Thanks for reaching out.

kalana de silva said:

If I power the MCU side of the digital isolator with 3.3V and the other side with 5V, do I need to use a level shifter? My MCU’s maximum pin voltage is 3.3V, while the tach signal from the fan is 5V.

The digital isolator itself can act as a level shifter since the two VCCx sides of the isolator can support different voltages. For more information, please see tis FAQ:  [FAQ] Can I power the two sides of a digital isolator with different voltages? 

Regards,
Aaditya V