Temperature compensation system for real-time clock and method

Abstract

The invention discloses a temperature compensation system for a real-time clock. The temperature compensation system for the real-time clock comprises a repairing regulating register, a compensation interval register, a low-phase error repairing regulating mechanism controller, a crystal oscillator and a frequency repairing regulating circuit, wherein the repairing regulating register is used for storing an increasing and reducing pulse flag bit F and a repairing regulating data M; the compensation interval register is used for storing a compensation interval time value T; the low-phase error repairing regulating mechanism controller connected with the repairing regulating register is used for outputting a repairing regulating value m of a present second clock within the compensation interval time value T by judging the second clock corresponding to the compensation under the present state according to the size of the repairing regulating data; the crystal oscillator is used for generating a clock frequency; and the frequency repairing regulating circuit connected with a clock generator and the low-phase error repairing regulating mechanism controller is used for performing a pulse increasing and reducing operation on the clock outputted by the crystal oscillator according to the increasing and reducing pulse flag bit F and finally outputting an accurate low-phase error 1Hz clock when the repairing regulating value m of the present second clock is received by the frequency repairing regulating circuit.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a temperature compensation system and method for a real-time clock of an electronic circuit. Background technique [0002] Real Time Clock (RTC for short) is an important component widely used in electronic circuits, which uses crystals to perform timing functions. The crystal oscillates at a preset frequency, and precise timing is achieved by updating a counter. Since the crystal frequency has the characteristic of drifting with temperature, the real-time clock must be temperature-compensated in order to obtain an accurate 1Hz clock. [0003] Compensation schemes such as figure 1 . The real-time clock digital temperature compensation system shown in the figure consists of a temperature sensor, ADC, ROM, compensation circuit, OSC, and RTC functional circuit. The trimming data of the OSC changing with temperature is stored in the ROM memory. The temperature sensor ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a real-time clock temperature compensation system and method to solve the problem that the compensation method in the prior art cannot solve the problem of real-time clock temperature compensation phase error

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