Electrostatic discharge countermeasure for docking cradles with exposed pins that connect to an active interface

• US 6,648,661 B1
• Filed: 11/08/2002
• Issued: 11/18/2003
• Est. Priority Date: 11/08/2002
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Byrne, Daniel J., Pandit, Amol S., Robins, Mark N.
• Primary Examiner(s): Prasad, Chandrika
• Application Number:
  US10/291,463
• Time in Patent Office: 375 Days
• Field of Search: 439/188, 439/108, 710/304, 710/303, 361/683, 361/686, 364/708.1, 395/281, 395/283
• US Class Current: 439/188
• CPC Class Codes: G06F 1/1632 External expansion units, e.g. docking stations
• CPC Class Codes: H01R 13/7031 Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity
• CPC Class Codes: H01R 13/7038 making use of a remote controlled switch, e.g. relais, solid state switch activated by the engagement of the coupling parts
• CPC Class Codes: H01R 2201/06 for computer periphery

Abstract

Apparatus and methods for disabling a USB or other interface connection between a personal computer and a docking cradle or device until the instant such a connection is actually needed. When the docking cradle is empty, the exposed pins are connected to a conductive ground path or is isolated. When a device is inserted into the docking cradle, the electrical signals that are connected to the personal computer by way of the interface are then switched on.

Claims

1. Apparatus comprising:

a dockable device having a docking connector;

a docking station having an actuator for detecting the presence of the dockable device and having an input-output connector that mates with the docking connector of the dockable device; and

a host computer coupled to the docking station by way of an interface;

and wherein the actuator connects signal lines of the interface to ground when there is no dockable device in the docking station, and wherein the actuator removes the signal lines of the interface connection from ground when the dockable device is docked with the docking station.

2. The apparatus recited in claim 1 wherein the dockable device comprises a camera.

3. The apparatus recited in claim 1 wherein the dockable device comprises a personal digital assistant.

4. The apparatus recited in claim 1 wherein the actuator comprises a mechanical actuator.

5. The apparatus recited in claim 1 wherein the actuator comprises an electronic actuator.

6. The apparatus recited in claim 1 wherein the interface comprises a USB interface.

7. A method of providing electrostatic discharge countermeasures for a dockable device, comprising the steps of:

providing a dockable device having a docking connector;

providing a docking station having an input-output connector and an actuator for detecting the presence of the dockable device;

coupling the docking station to a host computer by way of an interface;

when there is no dockable device in the docking station, connecting signal lines of the interface to ground; and

when the dockable device is docked with the docking station, removing the signal lines of the interface from connection to ground.

8. The method recited in claim 7 wherein the dockable device comprises a camera.

9. The method recited in claim 7 wherein the wherein the dockable device comprises a personal digital assistant.

10. The method recited in claim 7 wherein the wherein the actuator comprises a mechanical actuator.

11. The method recited in claim 7 wherein the wherein the actuator comprises an electronic actuator.

12. The method (recited in claim 7 wherein the interface is characterized by a USB interface.