ADG601: Connection between D and S

Good evening,

I'm using ADG601 as shown in the image above. When I provide an high value to SHDN i can correctly see VBatt = +VH. On the other hand, when I provide a low value to SHDN i can not see +VH = 0 V.

Can someone help me in understand why?

Thank you very much.

Best regards,

Matteo Colombo