Temperature-controlled variable resistor

• US 6,476,716 B1
• Filed: 11/15/2000
• Issued: 11/05/2002
• Est. Priority Date: 11/15/2000
• Status: Expired due to Term

• Current Assignee: Maxim Integrated Products, Inc. (Analog Devices, Inc.)
• Original Assignee: Dallas Semiconductor Corporation (Analog Devices, Inc.)
• Inventors: Ledlow, Dallas
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/713,502
• Time in Patent Office: 720 Days
• Field of Search: 340/501, 340/3.1, 340/506, 340/517, 700/4, 700/9, 700/19, 700/11, 700/12, 700/295, 700/300
• US Class Current: 340/501
• CPC Class Codes: G05B 15/02 electric

Abstract

A device and method to regulate an electronic device in response to temperature changes is shown and described. For example, the present invention can control devices that are operable in different operational modes. The method and the device can be used so as to include steps of sensing a temperature; accessing a table using the sensed temperature; reading an operational mode indicator from the table, wherein the operational mode indicator corresponds to the sensed temperature; and operating the device in the proper one of the operational modes that corresponds to the operational mode indicator.

Claims

1. A method for controlling a device operable in a plurality of operational modes, the method comprising:

sensing a temperature at least in part as a lookup indicia within said table;

accessing a table using the sensed temperature;

reading a operational mode from the table, wherein the operational mode corresponds to the sensed temperature; and

operating the device in the one of the plurality of operational modes that corresponds to the operational mode indicator the operational mode of the device according to the read regulator operational mode.

3. The method of claim 1, wherein the step of adjusting the operational mode comprises the step of:

adjusting a voltage output of a variable voltage source.

4. The method of claim 1, wherein the step of adjusting the operational mode comprises the step of:

adjusting a current output of a variable current source.

5. The method of claim 1, storing in the table a plurality of operational mode indicators, wherein each of the plurality of operational mode indicators is associated with one of a plurality of temperatures.

6. The method of claim 5, wherein the regulator operational data corresponds to a resistance setting.

7. The method of claim 5, wherein the regulator operational data corresponds to a voltage setting.

8. The method of claim 5, wherein the regulator operational data corresponds to a current setting.

2. A method for controlling a device operable in a plurality of operational modes, the method comprising:

sensing a temperature;

accessing a table using the sensed temperature;

reading a operational mode from the table, wherein the operational mode corresponds to the sensed temperature; and

operating the device in the one of the plurality of operational modes by adjusting a resistance level of a variable resistor that corresponds to the operational mode indicator the operational mode of the device according to the read regulator operational mode.

9. A temperature-responsive regulation device comprising:

a temperature sensor configured to sense a temperature;

a storage device configured to store a plurality of settings, wherein each one of the plurality of settings is associated with at least a particular temperature within a range of temperatures;

a regulator configured to be operable in one of a plurality of modes, wherein each one of the plurality of modes corresponds to at least one of the plurality of settings stored in the storage device and wherein the plurality of modes comprises a plurality of resistance levels; and

a controller electronically coupled with the temperature sensor, the storage device and the regulator;

wherein the controller is configured to retrieve a first of the plurality of settings from the storage device in response to receiving the temperature sensed by the temperature sensor; and

wherein the controller is configured to communicate at least an indication of the retrieved first of the plurality of settings to the regulator to thereby cause the regulator to be operable in a corresponding one of the plurality of modes.

10. The device of claim 9, wherein the plurality of modes comprises a plurality of voltage output levels.

11. The device of claim 9, wherein the plurality of modes comprises a plurality of current output levels.

12. The device of claim 9, wherein the storage device comprises a lookup table.

13. The device of claim 9, wherein at least one of the plurality of settings is user-reprogrammable.

14. The device of claim 9, wherein the regulator comprises:

a variable resistor.

15. The device of claim 9, wherein the regulator comprises:

a variable voltage source.

16. The device of claim 9, wherein the regulator comprises:

a variable current source.

17. The device of claim 9, wherein the device is incorporated into a laser diode driver.

18. The device of claim 9, wherein the device is incorporated into a wireless communication device.

19. The device of claim 9, further comprising:

an I/O interface connected to the controller.

20. A device comprising:

a temperature sensor for sensing a temperature;

a regulator electronically coupled to the temperature sensor, wherein the regulator is configured to be operable in a plurality of operational modes; and

a memory device electronically coupled with the regulator, wherein the memory device is configured to store a Operational mode plurality of indicators;

wherein each of the plurality of operational mode indicators is associated with at least one of the plurality of operational modes; and

wherein each one of the plurality of indicators is associated with a particular temperature; and

wherein a first of the plurality of indicators is retrievable responsive to the memory device receiving at least an indication of the sensed temperature; and

wherein the regulator is configured to receive the first of the plurality of indicators and thereby operate in the one of the plurality of operational modes that is associated with the received first of the plurality of indicators.

21. The device of claim 20, wherein the plurality of operational modes comprises:

a plurality of resistance levels.

22. The device of claim 21, wherein the plurality of operational modes comprises:

a plurality of voltage output levels.

23. The device of claim 20, wherein the plurality of operational modes comprises:

a plurality of current output levels.

24. The device of claim 20, wherein at least one of the plurality of settings is user-loadable.

25. The device of claim 21, wherein the device comprises:

a laser diode driver.

26. The device of claim 20, wherein the device comprises:

a wireless communication device.