Patent ID: 7822469

Claim:
A wrist-worn device, comprising: a monitor case; a display connected to the monitor case at a front of the wrist-worn device; a case back connected to the monitor case at a back of the wrist-worn device, the case back contacts a user's wrist when the wrist-worn device is worn by the user; a gearbox provided within the monitor case, the gearbox includes a magnetic coil, and is connected to the display; a crown dial exposed external to the monitor case and connected to the gearbox; monitor circuitry provided within the monitor case, at least in part, the monitor circuitry is configured to detect a heart rate of the user based on an EKG signal, where the case back is a first electrode of the monitor circuitry; and electrostatic discharge (ESD) protection circuitry connected between the case back and the gearbox, the ESD protection circuitry is configured to: (i) pass electro-static charges in a path between: (a) the gearbox and the crown dial and (b) the case back, and (ii) isolate the case back from the gearbox.