Post connection dual IRDA port power management

• US 6,563,618 B1
• Filed: 12/15/1998
• Issued: 05/13/2003
• Est. Priority Date: 12/23/1997
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Lawson, Brent A., Morrow, Neil G.
• Primary Examiner(s): Pascal, Leslie
• Assistant Examiner(s): Phan, Hanh
• Application Number:
  US09/212,133
• Time in Patent Office: 1,610 Days
• Field of Search: 359/152, 359/153, 359/110, 359/159, 359/172
• US Class Current: 398/135
• CPC Class Codes: H04B 10/1143 Bidirectional transmission
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

Prior art attempts to reduce the power consumption demands of dual infrared transceiver laptop computer designs have.included enabling and disabling infrared ports at the user level. This solution requires the computer user to be involved in decision making with respect to infrared peripheral device discovery, and adds complexity to the overall infrared communications experience. Post connection dual IrDA port power management implements the infrared transceiver power down decision making in software, based upon activity inputs from the infrared link controller. Minor changes to the link controller at its device driver improve the user experience and the power consumption in dual IrDA port configurations.

Claims

1. An infrared transceiver system comprising:

an infrared link controller;

a first infrared transceiver;

a second infrared transceiver;

the infrared link controller is coupled to the first and second infrared transceivers for receiving and sending information to the first and second infrared transceivers; and

a power management system, said power management system being operable to power down one of said first and second infrared transceivers in response to operation contention between said first and second infrared transceivers.

2. An infrared transceiver system as defined in claim 1, wherein the first and second infrared transceivers are compliant with the Infrared Data Association (IrDA) standard.

3. An infrared transceiver system as defined in claim 1, wherein the power management system is provided by the infrared link controller.

4. An infrared transceiver as defined in claim 1, wherein the power management system powers down the infrared transceiver from among the first and second infrared transceivers which is not involved in communications with an external device as determined by the infrared link controller.

5. An infrared transceiver as defined in claim 1, wherein the infrared link controller provides a link layer between infrared data from the first and second infrared transceivers and a host device.

6. An infrared transceiver as defined in claim 1, wherein a single infrared transmit line (IRTX) couples data provided by the infrared link controller that is to be transmitted by either the first or second infrared transceiver.

7. An electronic device that can communicate with an external device using infrared, the electronic device comprising:

first and second infrared transceivers;

a link controller coupled to the first and second infrared transceivers, the link controller determining which of the first or second infrared transceivers is in communication with the external device and automatically powering down the other one of the first or second infrared transceivers that is not in communication with the external device.

8. An electronic device as defined in claim 7, wherein the electronic device comprises a computer.

9. An electronic device as defined in claim 7, wherein the link controller automatically powers up the first or second infrared transceiver that was powered down once the communications between the electronic device and the external device have concluded.