I have an input connector which provides 12V power, and a few 5V logic lines. The 5V Vcc is derived from a local regulator:
What's best practice for ESD protection on this input connector? I'm thinking clamping diodes between the data line(s) and the power rails, but which rails?
- clamping to the 12V rail would subject the logic to a higher voltage
- clamping to the 5V rail would subject the regulator to the ESD
Alternately, do both? Or lose the 5V regulator and bring 5V and 12V in on the connector?