Wide range temperature error compensating method of real-time clock and system thereof

Abstract

The invention provides a wide range temperature error compensating method of a real-time clock and a system of the real-time clock. The compensating method comprises the following steps of: calculating the needed error compensation acc through acquiring current state information of a quartz crystal oscillator, judging whether the needed error compensation acc is in a regulating range provided by the system, if not, leading in a controllable error through regulating a crossover frequency of the quartz crystal oscillator so as to change the calculating value of the error compensation acc and cause the error compensation acc to be in the regulating range provided by the system, and compensating the temperature. The temperature error compensating method actively leads the controllable constant error amount E to the error compensation acc through regulating the crossover frequency of the quartz crystal oscillator so as to change the value of the error compensation acc and cause the error compensation acc to be in the regulating range provided by the product. Thus, the product is capable of compensating the temperature error without changing the hardware configuration and preventing theregulating range of the error compensation acc influencing the precise compensation.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a real-time clock (RTC, Real-Time Clock) wide-range temperature error compensation method and an error compensation system thereof. Background technique [0002] Nowadays, with the advancement of science and technology, higher requirements are placed on the accuracy of clocks in the existing embedded field to meet stricter and more accurate real-time applications. There are two factors that affect the accuracy of the clock, the first is the error of the quartz crystal itself, and the second is the error caused by the change of the ambient temperature. The former is the inherent error of the device itself, which is relatively constant and can be offset by compensation. The latter requires the establishment of a mathematical model of temperature and crystal frequency for compensation to offset the influence of errors. [0003] At present, there are usually two methods for ...

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Problems solved by technology

According to the above clock temperature compensation range calculation formula, it can be obtained that the temperature compensation range of this clock chip is -30°C<T<80°C, that is, the temperature error of this clock chip is only within the temperature range of -30°C<T<80°C. Compensable, beyond this range, the chip cannot perform accurate temperature error compensation

[0010] Combining the above factors, when the embedded system uses the software compensation method to compensate the clock error, it can only compensate within a certain temperature range, and it cannot continue to compensate if it exceeds this temperature range.

This is the biggest problem of the software compensation method in actual use

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