For ease of design, we would like to minimize the number of wireless power receiver IC signals connecting to our host.  How many connections does the IDT receiver IC require?

We look to the host simply like a 5V supply that they would use directly or input into a CMIC (Charge Management IC).  So we only have 1 pin connection to the host required, but if there’s a desire to have the Rx communicate system information back to the host, I2C lines or a GPIO status line would be required to update the Rx on the charging status of the system.