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Method for communicating CPU temperature information to a platform using a serial interface

IP.com Disclosure Number: IPCOM000074862D
Publication Date: 2005-Feb-23
Document File: 7 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for communicating central processing unit (CPU) temperature information to a platform using a serial interface. Benefits include improved functionality and improved performance

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Method for communicating CPU temperature information to a platform using a serial interface

Disclosed is a method for communicating central processing unit (CPU) temperature information to a platform using a serial interface. Benefits include improved functionality and improved performance.

Background

             

              A requirement exists for a platform to have CPU temperature information for acoustic control, fan speed control and thermal management mechanisms. Conventionally, the CPU temperature is not transmitted to a PC platform via hardware, but thermal diodes are used to approximate the die temperature. No hardware digital readout, either parallel or serial, is available.

              Any optical networking CPU can contain a digital CPU thermometer to perform platform thermal management. The digital thermometer computes the die temperature by monitoring the thermal sensors placed across the die. An analog-to-digital converter converts the sensor output to a temperature reading. A thermometer architecture enables software to read the current temperature by executing instructions, which returns the current temperature and other control information.

              A requirement exists to enhance the digital thermometer by adding a hardware-based temperature readout mechanism, which can theoretically provide a higher availability than software-based methods. The platform can use the information to implement thermal management mechanisms including fan-speed control without assistance from software.

              In a typical host/slave configuration, more than one slave device can exist per host. When the data transmission is one-way, from the master to the slave, data is broadcast to all the slaves on the bus.

General description

              The disclosed method is a serial temperature-out architecture using the CPU pins to transfer the temperature information to one or more devices on the platform. The CPU and the thermal management application-specific integrated circuits (ASICs) on the platform must adhere to a common specification included in the disclosed method to enable temperature readout via CPU pins.

              The disclosed method can be used to replace or improve acoustic and thermal management mechanisms on mobile, desktop and server platforms.

Advantages

              The disclosed method provides advantages, including:

•             Improved functionality due to providing hardware-driven CPU temperature information transfer to platform devices

•             Improved functionality due to enabling thermal management mechanisms, including fan-speed control, without assistance from software

•             Improved performance due to providing improved temperature accuracy and ease of use

Detailed description

              The disclosed method is a serial temperature readout mechanism that uses a 3-wire bus to transfer temperature information from a CPU to one or more devices on a platform. The transfer must occur at a rate equal to or faster th...