temperature measuring device

Abstract

The invention provides a temperature measuring device, which includes a polarity detection module and an analog-to-digital conversion module; wherein the polarity detection module includes: an analog switch unit, the input end of the analog switch unit is electrically connected to the output end of the remote transistor; A polarity detection unit, the input end of the polarity detection unit is electrically connected to the output end of the analog switch unit, and the input end of the polarity detection unit is respectively electrically connected to the power supply VDD and the power supply VDD-0.3V. The invention integrates a polarity detection module inside. Before each temperature measurement, it first detects the connection polarity of the external transistor, and adjusts the direction of the chip excitation current according to the polarity detection result, so that no matter what polarity the remote transistor is connected to, The purpose of accurately measuring the temperature value. The invention can measure the temperature of the remote transistor, detect the connection polarity of the remote transistor before each temperature measurement, and control the flow direction of the internal excitation current according to the detection result to realize blind insertion. Can get the correct temperature data, greatly improving the ease of use.

Description

Technical field[0001]The present invention relates to the field of digital circuit, in particular, a temperature measuring device compatible with the polarity interchange of distal transistors.Background technique[0002]In a computer application neighborhood, you need to measure a variety of temperature values ​​to achieve temperature monitoring, over-temperature alarm, adaptive adjustment, etc., such as monitoring central processor (CPU), graphics processor (GPU), and FPGAs are located in the same The temperature of the motherboard, when a chip temperature is superior, by starting the fan, reducing the operating frequency and other means, precise temperature control, preventing the system damage to the high temperature.[0003]The distal transistor is used as a two-port sensing temperature element, and its port voltage is determined to correspond to the temperature. Usually we refer to the current into the terminal as DXP, and the current flow is terminated as DXN. Commonly used discr...

AI Technical Summary

Problems solved by technology

[0007] Existing technology 2 is to apply a 1:5 current to the internal base-collector short-circuited PNP transistor pair to generate temperature-related VBE and ΔVBE values. The decimal temperature value is obtained through the second-order ΔΣADC. The disadvantage is that it can only Measuring the local temperature of the chip is not suitable for the application of external transistors; and the sampling / amplification clock frequency changes with the output bit stream, and the clock circuit implementation is complicated

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