TIDA-01513: how to handle the connection between GNDi and HV_NEG

Hi team,

I help my customer to post a question.

"I want to get some technical assist for TIDA-01513 High voltage measurement,in this circuit i think GNDi and HV_NEG should be connect for avoid floating,but in TIDA01513 reference design, GNDi and HV_NEG are not connected,I would like to know how to handle the connection between GNDi and HV_NEG.

https://www.ti.com/lit/df/tidrw46/tidrw46.pdf?ts=1652960839146

"

Thank you very much for your help.

Best regards,