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Temp. compensating circuit and method

A temperature compensation circuit and temperature compensation technology, applied in the field of compensation circuits, can solve the problems of occupying ADC channels and uneconomical cost.

Inactive Publication Date: 2006-08-30
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Because in the existing technology, to achieve temperature compensation, an external component must be used as a temperature sensor, and an ADC channel must be occupied, which is not economical in cost

Method used

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  • Temp. compensating circuit and method
  • Temp. compensating circuit and method

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Embodiment Construction

[0026] The present invention utilizes the existing monitoring clock oscillator of general micro-controllers, and simultaneously provides a set of stable and temperature-invariant voltage sources, that is, built-in voltage stabilizing circuits in general measurement applications, and a set of accurate timing device to achieve the function of temperature compensation.

[0027] Since the oscillation frequency of the monitor clock oscillator is mainly affected by its power supply voltage and external temperature, and a stable voltage source is provided as its power supply in the present invention, only the external temperature is left as a factor. The oscillation frequency of the watchdog clock oscillator will monotonically increase or slow down as the temperature changes. Therefore, through the corresponding curve of the watchdog clock oscillator frequency versus temperature established in advance, we can know the current temperature, and This is used for temperature compensation...

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Abstract

The invention relates to a temperature compensation circuit and the method. The temperature compensation circuit includes a first oscillator to supply a first impulse signal, a timer electrically connecting to the first oscillator, a voltage regulator to generate a fixed voltage, a second oscillator electrically connecting to the voltage regulator, and a counter that electrically connects to the first oscillator to gain a counting value and the frequency of the second oscillator to take temperature compensation.

Description

【Technical field】 [0001] The present application is a compensation circuit and method, especially a temperature compensation circuit and method. 【Background technique】 [0002] Watchdog clock is a technique commonly used in microcontrollers (Microprocessor Control Unit, MCU). Generally speaking, the microcontroller includes an internal free-running (Free Run) oscillator (Oscillator, OSC), a timer that can be cleared by software, and a reset signal that can be generated when the timer overflows. circuit. The microcontroller uses the oscillator as the timing source of the timer. When the microcontroller fails to clear the timer within a certain period of time, it is considered that the microcontroller is not working properly, so through the circuit to generate the reset signal to restore the microcontroller to normal operation. [0003] Temperature compensation is a technology commonly used in measurement applications to correct the influence of external temperature changes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028G01G23/48
Inventor 陈国祥林俊谷陈俊雄
Owner HOLTEK SEMICON
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