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Electrostatic discharge protection for analog component of wrist-worn device

  • US 7,822,469 B2
  • Filed: 06/13/2008
  • Issued: 10/26/2010
  • Est. Priority Date: 06/13/2008
  • Status: Expired due to Fees
First Claim
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1. 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.

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