Real-time clock integrated circuit and electronic apparatus thereof

Abstract

The present invention discloses a real-time clock integrated circuit and an electronic device thereof. The real-time clock integrated circuit provided by the present invention only utilizes a low-power oscillator to provide a timing reference clock required by a real-time counter, and performs the compensation to the timing reference clock with frequency drift generated by the low power oscillatorin the manner of table look-up, so that not only the power consumption, production cost and design complexity of the whole real-time clock integrated circuit can be reduced simultaneously, but also the time of the timing operation of the real-time clock integrated circuit can be prolonged.

Description

technical field [0001] The invention relates to a real-time clock integrated circuit and its electronic device, and in particular to a real-time clock integrated circuit with low cost, low power consumption, low production cost and low design complexity and its electronic device. Background technique [0002] Modern life is an electronic life, and life is full of various electronic devices, many of which are equipped with a clock function to increase the convenience of use. For example: For example, scheduled recording of a VCR or timing on / off of an audio system requires the cooperation of a Real Time Clock Integrated Circuit (RTC IC). In addition, currently commonly used personal computers, mobile phones, MP3, PDA or cameras also have RTC ICs, so that after the above-mentioned electronic devices are powered off, the RTC ICs can continue to maintain the timing operation, so as to wait for the above-mentioned electronic devices to be turned on again. , the RTC IC can immedi...

AI Technical Summary

Problems solved by technology

In this way, because the low-power oscillator itself will consume a lower driving current on the above-mentioned button-type lithium battery, the time for the RTC IC 100 to perform timing operations will be longer

[0008] However, low-power oscillators are susceptible to interference from environmental variables (such as: temperature, humidity, process, operating voltage, etc.) that affect the accuracy of the timing reference clock it provides

Therefore, in the technical content disclosed in U.S. Patent No. 6,873,215, a sensor is added to the integrated circuit to measure the timing reference clock provided by the low-power oscillator, and when the timing reference clock provided by the low-power oscillator is generated When the frequency drifts, the timing reference clock provided by the quartz oscillator is used to compensate the timing reference clock for the frequency drift of the low-power oscillator, but the technical means of directly measuring the timing reference clock provided by the low-power oscillator, It will not only increase the complexity of the overall design of the integrated circuit, but also increase the production cost of the integrated circuit

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