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BQ76930: BQ76930: ISO1541D isolate query

Star Xu
Genius 9645 points
Part Number: BQ76930

Hi

My customer have a query with BQ76930 cascade.

The high-string BQ76930 uses an ISO1541D to isolate IIC communication, why the MCU needs two wires to control the VCC1 and VCC2 of this ISO1541D.

According to the ISO1541D instructions, any voltage of VCC1, VCC2 is less than 2.1V, and the output is high Resistance state, then why need to control VCC1?

Is it possible only control VCC2 on the MCU side.

Thanks

Star