I am designing a keyboard which will connect to the computer via usb-miniB to charge a LiPo battery. The datasheet for the charging IC I am using specifies overvoltage protection on the USB power line, and I have been looking into various TVS diodes. I am finding differing information about where to connect the TVS diodes to:
This FTDI doc provides an example to shield ground, and also advocates and RC filter connecting shield ground and signal ground.
This TI part, which is advertised as for USB, provides an example to signal ground.
I am wondering which is the better practice, and whether that practice changes depending on whether it is a TVS intended for OVP rather than ESD protecton.