CN104868847A - High-performance low-power-consumption real time clock - Google Patents
High-performance low-power-consumption real time clock Download PDFInfo
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- CN104868847A CN104868847A CN201510166960.XA CN201510166960A CN104868847A CN 104868847 A CN104868847 A CN 104868847A CN 201510166960 A CN201510166960 A CN 201510166960A CN 104868847 A CN104868847 A CN 104868847A
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- crystal oscillator
- clock
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- power
- atomic clock
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Abstract
The invention discloses a high-performance low-power-consumption real time clock comprising a temperature-compensation crystal oscillator and/or a micro-star atomic clock. A frequency divider is connected on the temperature-compensation crystal oscillator and/or the micro-star atomic clock. An RTC chip is connected on the frequency divider. Besides, a low-power-consumption CPU is also connected on the temperature-compensation crystal oscillator and/or the micro-star atomic clock. A voltage adjusting device is also arranged between the temperature-compensation crystal oscillator and/or the micro-star atomic clock and the CPU. Furthermore, a calibrating device is also connected on the temperature-compensation crystal oscillator and/or the micro-star atomic clock. The beneficial effects of the high-performance low-power-consumption real time clock are that high stability frequency reference signals are converted via the voltage adjusting device and the low-frequency CPU, the signals are converted into standard brick signals via the frequency divider, and the characteristic of real-time output time is achieved in combination with the RTC chip. Meanwhile, precision of output time is guaranteed and working performance of the clock is enhanced.
Description
Technical field
The present invention relates to a kind of real-time clock (RTC) of high-performance low-power-consumption.
Background technology
Some RTC modules, better performances, within its day, deviation is substantially all at second-time, and for the higher occasion of a lot of time application demand, the RTC module demand that timekeeping performance is higher is very urgent; Mainly be difficult to break through precision, power consumption and supplying cell this to contradiction.
For the problem in correlation technique, at present effective solution is not yet proposed.
Summary of the invention
The object of this invention is to provide a kind of real-time clock (RTC) of high-performance low-power-consumption, to overcome currently available technology above shortcomings.
The object of the invention is to be achieved through the following technical solutions:
A kind of real-time clock (RTC) of high-performance low-power-consumption, comprise temperature compensating crystal oscillator and/or Microstar's atomic clock, described temperature compensating crystal oscillator and/or Microstar's atomic clock are connected with frequency divider, described frequency divider is connected with RTC chip, in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock are also connected with low power consumption CPU, described temperature compensating crystal oscillator and/or be also provided with regulator between Microstar's atomic clock and described CPU, in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock is also connected with caliberating device.
Further, the rated current of described temperature compensating crystal oscillator and/or Microstar's atomic clock is 1.7ma, and frequency stability is better than 0.1ppm.
Further, described frequency divider is the cmos circuit that impedance is high, load capacitance is little, low in energy consumption.
Beneficial effect of the present invention is: transformed by steady for height reference frequency signal by regulator and low frequency CPU, and convert the signal into standard brick signal by frequency divider, just and and RTC chip combine the feature reaching real-time output time, ensure that the precision of output time simultaneously, and improve the service behaviour of clock.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the real-time clock (RTC) structural representation of the high-performance low-power-consumption according to the embodiment of the present invention.
In figure:
1, frequency divider; 2, RTC chip; 3, low power consumption CPU; 4, regulator; 5, caliberating device.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
As shown in Figure 1, the real-time clock (RTC) of a kind of high-performance low-power-consumption according to embodiments of the invention, comprise temperature compensating crystal oscillator and/or Microstar's atomic clock, described temperature compensating crystal oscillator and/or Microstar's atomic clock are connected with frequency divider 1, described frequency divider 1 is connected with RTC chip 2, in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock are also connected with low power consumption CPU 3, described temperature compensating crystal oscillator and/or be also provided with regulator 4 between Microstar's atomic clock and described CPU3, in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock is also connected with caliberating device 5.
Further, the rated current of described temperature compensating crystal oscillator and/or Microstar's atomic clock is 1.7ma, and frequency stability is better than 0.1ppm.
Further, described frequency divider 1 is the cmos circuit that impedance is high, load capacitance is little, low in energy consumption.
Further, temperature compensating crystal oscillator and/or Microstar's atomic clock can produce crystal oscillator frequency change when in use, and then affect the accuracy rate of high temperature frequency, wherein specifically comprise:
1. aging
Aging is that the physical characteristic of crystals changes in time and causes frequency of oscillation to change.
2. environmental condition
The environmental stress changes such as temperature, vibrations, impact can cause crystal oscillator frequency to change.Due to punctual be in store status, therefore in the design, temperature is the environmental factor of major effect crystal oscillator frequency change.
3. electric condition
The power supply of crystal oscillator and the change of output load can cause crystal oscillator frequency to change.
In order to effectively reduce the aging impact come to clock difference band of crystal oscillator or miniature atomic clock, needing its aging rule of quantitative description, modeling is carried out to clock clock correction.
Set up frequency marking frequency of oscillation model
(1)
In formula,
---
time-frequency target frequency of oscillation, is referred to as original frequency;
---the frequency drift rate of frequency marking;
---the frequency of oscillation nominal value of frequency marking;
---frequency marking exists
the change at random in moment.
Should be noted
unit with
the unification of chronomere, if
for day drift rate or the moon drift rate,
unit also should be day or the moon mutually.
The accuracy model of frequency marking frequency of oscillation
(2)
In formula,
---frequency marking exists
the frequency accuracy in moment;
---the initial frequency accuracy of frequency marking
(3)
Frequency marking clock clock bias model
Change to from the zero selected moment when the time
during the moment, time difference is
(4)
In formula,
---
the time difference in moment.
---when
time time difference, be referred to as initial time difference;
---
in time, is engraved in
average relative frequency deviation in time
(5)
Can find out, affect clock clock correction mainly by frequency drift rate, initial frequency accuracy, the random error of frequency and the clock correction of initial time cause.
Frequency demarcating technology
By measuring time difference variable quantity
carry out frequency marking demarcation, this is also the basis of software compensation.
3) punctual precision analysis and estimation
Change to from the zero selected moment
during the moment, time difference is
(6)
Known, the punctual precision of impact mainly contains the factor of four aspects, analyzes one by one below:
, caused by clock drift rate, it reflects the ageing rate of crystal oscillator, be caused by the change in physical properties of crystal, be unidirectional, can demarcate very accurately, negligible through the impact of calibrated clock drift rate on the time difference.
,
, be caused by the time difference when frequency difference of initial calibrating frequency and school, adopt the new technologies such as satellite demarcation, correcting delay precision can reach nanosecond order, as utilized long calibrating frequency, and initial frequency errors
10-11 or more high-magnitude can be reduced to.
, be random error, reflect the frequency stability of crystal oscillator, if temperature is relatively more even, its anomalous integral is very little.
Comprehensively above-mentioned, the RTC module precision that final design goes out can meet the technical indicator that year drift rate is less than 1s.
In sum, by means of technique scheme of the present invention, by regulator and low frequency CPU, steady for height reference frequency signal is transformed, and convert the signal into standard brick signal by frequency divider, just and and RTC chip combine the feature reaching real-time output time, ensure that the precision of output time simultaneously, and improve the service behaviour of clock.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the real-time clock (RTC) of a high-performance low-power-consumption, it is characterized in that, comprise temperature compensating crystal oscillator and/or Microstar's atomic clock, described temperature compensating crystal oscillator and/or Microstar's atomic clock are connected with frequency divider (1), described frequency divider (1) is connected with RTC chip (2), in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock are also connected with low power consumption CPU (3), described temperature compensating crystal oscillator and/or Microstar's atomic clock and described CPU(3) between be also provided with regulator (4), in addition described temperature compensating crystal oscillator and/or Microstar's atomic clock are also connected with caliberating device (5).
2. the real-time clock (RTC) of high-performance low-power-consumption according to claim 1, is characterized in that, the rated current of described temperature compensating crystal oscillator and/or Microstar's atomic clock is 1.7ma, and frequency stability is better than 0.1ppm.
3. the real-time clock (RTC) of the high-performance low-power-consumption of high-performance low-power-consumption according to claim 1, is characterized in that, described frequency divider (1) is the cmos circuit that impedance is high, load capacitance is little, low in energy consumption.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510166960.XA CN104868847A (en) | 2015-04-09 | 2015-04-09 | High-performance low-power-consumption real time clock |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510166960.XA CN104868847A (en) | 2015-04-09 | 2015-04-09 | High-performance low-power-consumption real time clock |
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| CN104868847A true CN104868847A (en) | 2015-08-26 |
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| CN201510166960.XA Pending CN104868847A (en) | 2015-04-09 | 2015-04-09 | High-performance low-power-consumption real time clock |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106647235A (en) * | 2016-12-29 | 2017-05-10 | 福建奥通迈胜电力科技有限公司 | Wireless timing method for recording type fault indicator |
Citations (5)
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|---|---|---|---|---|
| US4446446A (en) * | 1981-07-17 | 1984-05-01 | Rockwell International Corporation | Programmable frequency synthesizer primarily for use in an atomic clock |
| CN1909375A (en) * | 2005-08-03 | 2007-02-07 | 乐金电子(中国)研究开发中心有限公司 | Real-time clock device and current time compensating method |
| US7258009B2 (en) * | 2004-01-27 | 2007-08-21 | Seiko Epson Corporation | Clock generating device, vibration type gyro sensor, navigation device, imaging device, and electronic apparatus |
| CN103152041A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Measurement method of transformation of refined structure constant and system with the same applied |
| CN104199278A (en) * | 2014-09-04 | 2014-12-10 | 中国科学院测量与地球物理研究所 | Multi-navigation-system based anti-occlusion high-accuracy synchronous clock system and synchronous method thereof |
-
2015
- 2015-04-09 CN CN201510166960.XA patent/CN104868847A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4446446A (en) * | 1981-07-17 | 1984-05-01 | Rockwell International Corporation | Programmable frequency synthesizer primarily for use in an atomic clock |
| US7258009B2 (en) * | 2004-01-27 | 2007-08-21 | Seiko Epson Corporation | Clock generating device, vibration type gyro sensor, navigation device, imaging device, and electronic apparatus |
| CN1909375A (en) * | 2005-08-03 | 2007-02-07 | 乐金电子(中国)研究开发中心有限公司 | Real-time clock device and current time compensating method |
| CN103152041A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Measurement method of transformation of refined structure constant and system with the same applied |
| CN104199278A (en) * | 2014-09-04 | 2014-12-10 | 中国科学院测量与地球物理研究所 | Multi-navigation-system based anti-occlusion high-accuracy synchronous clock system and synchronous method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106647235A (en) * | 2016-12-29 | 2017-05-10 | 福建奥通迈胜电力科技有限公司 | Wireless timing method for recording type fault indicator |
| CN106647235B (en) * | 2016-12-29 | 2019-02-15 | 福建奥通迈胜电力科技有限公司 | A kind of punctual method wireless for recording type fault detector |
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Application publication date: 20150826 |