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RTC self-compensating circuit based on temperature sensor

A temperature sensor and self-compensation technology, applied in the application of thermometers, thermometers, instruments, etc., can solve the problems of high software participation, insufficient accuracy and efficiency, and difficulty in ensuring the accuracy of temperature compensation circuits, etc., to achieve easy implementation and compensation High precision and efficiency, flexible and configurable temperature coefficient

Inactive Publication Date: 2020-11-27
苏州萨沙迈半导体有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, there are problems with these two methods: 1. The temperature compensation circuit of the crystal oscillator is difficult to guarantee the accuracy, and it is not flexible for different types of crystals; 2. The software solution requires a high degree of software participation, which increases the software overhead
At the same time, hardware automatic control cannot be realized, and the accuracy and efficiency of compensation are not good enough.

Method used

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  • RTC self-compensating circuit based on temperature sensor
  • RTC self-compensating circuit based on temperature sensor

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Experimental program
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Effect test

Embodiment 1

[0017] See figure 2 , A temperature sensor-based RTC self-compensation circuit, including a temperature sensor, an analog-to-digital converter, and a temperature register. The temperature sensor, analog-to-digital converter and temperature register are connected in sequence, and the temperature register is also connected with a compensation coefficient generator. The coefficient generator is also connected to the RTC counter. The input of the RTC counter is connected with a crystal oscillator. The crystal oscillator is a circuit module that generates 32768 Hz by connecting a quartz crystal with a 32K resonant frequency. The quartz crystal is at different temperatures. Its resonance frequency has a certain fluctuation, which is also the main source of inaccurate timing of the RTC counter. Temperature sensors and analog-to-digital converters are commonly used circuits in general SOC systems to detect chip temperature and perform analog-to-digital conversion on some analog inputs....

Embodiment 2

[0024] On the basis of Embodiment 1, the RTC counter is connected to a time-minute-second controller, and the calculation accuracy of the counter is further ensured through an external device.

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Abstract

The invention discloses an RTC self-compensating circuit based on a temperature sensor. The circuit comprises a temperature sensor, an analog-to-digital converter and a temperature register, and the temperature sensor, the analog-to-digital converter and the temperature register are connected in sequence. The temperature register is further connected with a compensation coefficient generator, thecompensation coefficient generator is further connected with an RTC counter, the input end of the RTC counter is connected with a crystal oscillator, and the crystal oscillator is a circuit module which is externally connected with a quartz crystal with the 32K resonant frequency to generate 32768 Hz. The analog-to-digital converter has a hardware triggering mechanism. The RTC self-compensating circuit has the advantages that 1, hardware automatically completes RTC timing compensation, and software participation is not needed in the compensation process; 2, the temperature coefficient is flexible and configurable, and the compensation precision and efficiency are high; and 3, the RTC compensation circuit adopts pure digital logic design and is easy to realize in circuit design.

Description

Technical field [0001] The invention relates to the design and application field of integrated circuits, in particular to an RTC self-compensation circuit based on a temperature sensor. Background technique [0002] In the current chip application field, the system's accuracy requirements for RTC (Real-time clock) are constantly improving. The application of high-precision RTC involves electricity meters, industry, communications and other equipment with embedded payment systems, global satellite navigation receivers And other industrial applications; the temperature drift of the quartz crystal is the main factor of the accuracy of the RTC timekeeping. Generally, the temperature drift of the quartz crystal in the range of -40 to 150 degrees may be between plus or minus several hundred ppm. [0003] There are two current temperature compensation schemes for RTC: One is to make a temperature compensation circuit for the quartz crystal in the crystal oscillator. This scheme mainly adj...

Claims

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Application Information

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IPC IPC(8): H03H9/17H03H9/02G01K13/00
CPCG01K13/00H03H9/02H03H9/17
Inventor 何学文陈岗章伟张恩勤
Owner 苏州萨沙迈半导体有限公司