Power saving method of bi-directional communication wireless periheral device

• US 7,900,070 B2
• Filed: 05/30/2007
• Issued: 03/01/2011
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Integrated System Solution Corp.
• Inventors: Su, Dar-chern, Wu, Hsin-Ju, Chen, Albert
• Primary Examiner(s): SURYAWANSHI, SURESH
• Application Number:
  US11/755,005
• Publication Number:
  US 20080209083A1
• Time in Patent Office: 1,371 Days
• Field of Search: 713/300, 713/320, 713/323, 713/324
• US Class Current: 713/320
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/325 Power saving in peripheral device

Abstract

A power saving method of a bi-directional communication wireless peripheral device includes providing a wireless communication protocol between a host and the bi-directional communication wireless peripheral device; establishing a bi-directional communication wireless link between the host and the bi-directional communication wireless peripheral device through the wireless communication protocol; and enter a power off mode when the bi-directional communication wireless link does not exist.

Claims

1. A power saving method for a bi-directional communication wireless peripheral device in communication with a host, comprising:

providing a wireless communication protocol between the host and the bi-directional communication wireless peripheral device;

establishing a bi-directional communication wireless link between the host and the bi-directional communication wireless peripheral device through the wireless communication protocol; and

entering a power off mode when the bi-directional communication wireless link does not exist, wherein in the power off mode, a plurality of functional modules in the bi-directional communication wireless peripheral device is in a non-operating state,

wherein the bi-directional communication wireless peripheral device further comprises the following operational modes;

an initial mode, a working mode, a stand-by mode, wherein in the initial mode, the functional modules of the bi-directional communication wireless peripheral device are activated, the bi-directional communication wireless link is attempted to be established, the working mode is entered when the bi-directional communication wireless link is established, and the power off mode is entered when the bi-directional communication wireless link fails to be established;

in the working mode, the functional modules are in the operating state; and

in the stand-by mode, a part of the functional modules are in the non-operating state, if the bi-directional communication wireless peripheral device receives a user operation in a first predetermined time, the bi-directional communication wireless peripheral device will enter the working mode from the stand-by mode, if the bi-directional communication wireless peripheral device does not receive a user operation for the first predetermined time or the bi-directional communication wireless link does not exist, the bi-directional communication wireless peripheral device will enter the power off mode from the stand-by mode.

2. The power saving method as claimed in claim 1, further comprising:

entering the stand-by mode after a second predetermined time since the bi-directional communication wireless peripheral device does not receive the user operation in the working mode.

3. The power saving method as claimed in claim 1, wherein the bi-directional communication wireless peripheral device further comprises an attempt link mode, when the bi-directional communication wireless link breaks off, the bi-directional communication wireless peripheral device enters the attempt link mode to reestablish the bi-directional communication wireless link.

4. The power saving method as claimed in claim 3, wherein “

when the bi-directional communication wireless link breaks off”

, the method further comprises;

when the bi-directional communication wireless link breaks off, firstly entering the attempt link mode to attempt to reestablish the bi-directional communication wireless link at least once; and

when it fails to establish the bi-directional communication wireless link, entering the power off mode.

5. A bi-directional communication wireless peripheral device, comprising:

a plurality of functional modules;

a wireless communication module, comprising a wireless communication protocol, for establishing a bi-directional communication wireless link to a host through the wireless communication protocol; and

a power management apparatus, turning off the functional modules when the bi-directional communication wireless link does not exist, wherein the power management apparatus comprises;

a state machine, comprising;

an initial mode, for activating a plurality of functional modules of the bi-directional communication wireless peripheral device, establishing the bi-directional communication wireless link, entering a working mode when the bi-directional communication wireless link is established, and entering a power off mode when the bi-directional communication wireless link fails to be established;

the working mode, in which the functional modules are in the operating state;

a stand-by mode, in which a part of the functional modules are in the non-operating state, if the bi-directional communication wireless peripheral device in the stand-by mode receives a user operation in a predetermined time, the bi-directional communication wireless peripheral device will enter the working mode from the stand-by mode; and

the power off mode, for making the functional modules being in the non-operating state,

wherein when the bi-directional communication wireless link is established, enter the working mode;

after the predetermined time since the bi-directional communication wireless peripheral device does not receive a user operation, enter the stand-by mode; and

when the bi-directional communication wireless link does not exist, enter the power off mode.

6. The bi-directional communication wireless peripheral device as claimed in claim 5, wherein the state machine further comprises:

an attempt link mode, wherein when the bi-directional communication wireless peripheral device fails to establish the bi-directional communication wireless link in the initial mode, or the bi-directional communication wireless link breaks off in the working mode or the stand-by mode, enter the attempt link mode to reestablish link.