(ADuM3223/ADuM4224)Which pin is monitored by the device for UVLO?

Hi!

I have a question about ADuM3223/4223 UVLO.

At the data sheet , I understood that the device is monitoring VDD2 for UVLO.

Which VDD2 are monitored by the device?

I want to know.

>If VDDA is 0V and VDDB is ON, would channel B would work or shut-down?

>If VDDB is 0V and VDDA is ON, would channel A would work or shut-down?

I want to know this because I am trying to design boot-strap circuit with these device.

I would really appreciate if you don't mind to teach me about this.

Best regards.

Kawa