Controller for monitoring temperature

• US 6,937,958 B2
• Filed: 02/19/2002
• Issued: 08/30/2005
• Est. Priority Date: 02/19/2002
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: House, Kenneth, Gold, Spencer, Gauthier, Claude R., Zarrineh, Kamran
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): Sun, Xiuqin
• Application Number:
  US10/079,475
• Publication Number:
  US 20030158696A1
• Time in Patent Office: 1,288 Days
• Field of Search: 702/132, 702/130, 374/178, 716/4, 713/300
• US Class Current: 702/132
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: H01L 23/34 Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements thermal treatment apparatus H01L21/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A controller and method are provided for monitoring and controlling a temperature of an integrated circuit to inhibit damage from a thermal problem. The controller and method allow for individual temperature thresholds for each of one or more temperature sensors. Digital filtering of values received from temperature sensors is also provided. A variety of actions can be selected for execution upon a determination of an over-temperature condition of the integrated circuit, including assert an over-temperature pin, assert an over-temperature bit in an error register of said controller, assert an over-temperature bit in an error register of said microprocessor, issue an over-temperature interrupt to a service bus of said integrated circuit, cause a trap, slow an operating frequency of said integrated circuit, stop said integrated circuit, and do nothing.

Claims

1. A controller for monitoring a temperature of an integrated circuit, comprising:

a first interface for receiving a first value representative of an temperature of said integrated circuit, the first value is produced by one of an active thermal sensor and a passive thermal sensor formed in said integrated circuit;

a second interface for receiving a second value representative of a threshold temperature;

a comparator for comparing said first value to said second value; and

a comparator response logic coupled to said comparator for determining in response to a comparison of said first value to said second value by said comparator whether an over-temperature condition in said integrated circuit exists.

2. The controller of claim 1, further comprising a temperature measurement buffer for holding said first value received from said first interface.

3. The controller of claim 2, further comprising a serial temperature capture device for receiving a plurality of temperatures of said integrated circuit and sequentially providing said plurality of temperatures of said integrated circuit to said temperature measurement buffer.

4. The controller of claim 3, wherein said serial temperature capture device is adapted to receive a plurality of temperatures from a plurality of thermal sensors.

5. The controller of claim 3, further comprising a threshold buffer corresponding to said temperature measurement buffer and adapted to store a second value representative of a threshold temperature.

6. The controller of claim 5, wherein said threshold buffer is located external to said controller.

7. The controller of claim 2, wherein said temperature measurement buffer is adapted to receive said first value by way of a single wire.

8. The controller of claim 2, wherein said temperature measurement buffer is adapted to receive said first value by way of a plurality of wires.

9. The controller of claim 2, further comprising a microprocessor adapted to communicate with said temperature measurement buffer to read said first value and thermally profile said integrated circuit.

10. The controller of claim 2, wherein said temperature measurement buffer is located external to said controller.

11. The controller of claim 1, further comprising:

a plurality of temperature measurement buffers, wherein each temperature measurement buffer is adapted to receive a value representative of a temperature of an integrated circuit.

12. The controller of claim 11, wherein at least one of said plurality of temperature measurement buffers is located external to said controller.

13. The controller of claim 11, further comprising:

a serial temperature capture device for receiving a plurality of temperatures of said integrated circuit and providing said plurality of temperatures of said integrated circuit to said plurality of temperature measurement buffers.

14. The controller of claim 11, wherein at least one of said plurality of said temperature measurement buffers adapted to receive said first value by way of a single wire.

15. The controller of claim 11, wherein at least one of said plurality of said temperature measurement buffers is adapted to receive said first value by way of a plurality of wires.

16. The controller of claim 11, further comprising a microprocessor adapted to communicate with said plurality of temperature measurement buffers to read said values representative of temperatures of an integrated circuit and thermally profile said integrated circuit.

17. The controller of claim 11, further comprising a plurality of threshold buffers corresponding to said plurality of temperature measurement buffers and adapted to store a plurality of second values representative of threshold temperatures.

18. The controller of claim 1, further comprising:

a window size buffer adapted to store a window size value and coupled to said comparator response logic;

wherein said comparator response logic operates as an up/down counter, counting said over-temperature conditions and determining whether an over-temperature condition in said integrated circuit exists when said up/down counter reaches said window size value.

19. The controller of claim 1, further comprising:

a window size buffer adapted to store a window size value and coupled to said comparator response logic;

wherein said comparator response logic operates as a counter, counting said over-temperature conditions occurring sequentially and determining whether an over-temperature condition in said integrated circuit exists when said counter reaches said window size value.

20. The controller of claim 1, wherein said comparator response logic uses digital filtering to filter said first value representative of a temperature of said integrated circuit.

21. The controller of claim 1, further comprising a response buffer coupled to said comparator response logic for storing a value representative of a response to said over-temperature condition.

22. The controller of claim 21, wherein said response comprises one of the group of assert an over-temperature pin, assert an over-temperature bit in an error buffer of said controller, assert an over-temperature bit in an error buffer of said microprocessor, issue an over-temperature interrupt to a service bus of said integrated circuit, cause a trap, slow an operating frequency of said integrated circuit, stop said integrated circuit, and do nothing.

23. The controller of claim 21, further comprising an interface from said response buffer to a microprocessor to enable said microprocessor to write to said response buffer.

24. The controller of claim 23, further comprising said microprocessor.

25. The controller of claim 1, further comprising an interface from said comparator response logic to a microprocessor to enable said microprocessor to communicate with said comparator response logic.

26. The controller of claim 25, further comprising said microprocessor.

27. The controller of claim 1, further comprising an interface from said first interface to a microprocessor to enable said microprocessor to read said first interface.

28. The controller of claim 1, further comprising an interface from said second interface to a microprocessor to enable said microprocessor to write to said second interface.