CN2701170Y - A real-time clock control circuit - Google Patents
A real-time clock control circuit Download PDFInfo
- Publication number
- CN2701170Y CN2701170Y CN 200420041374 CN200420041374U CN2701170Y CN 2701170 Y CN2701170 Y CN 2701170Y CN 200420041374 CN200420041374 CN 200420041374 CN 200420041374 U CN200420041374 U CN 200420041374U CN 2701170 Y CN2701170 Y CN 2701170Y
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- Prior art keywords
- real
- clock control
- time clock
- control chip
- circuit
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- Expired - Fee Related
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Abstract
The utility model discloses a real-time clock control circuit, comprising a main power source, an emergency battery and a real-time clock control chip. The utility model adopts the real-time clock control chip instead of the traditional clock circuit, makes use of 512X8 bits memory space in the utility model and realizes the communication with CPU via an IC bus, thus finishing the installation which is brought to the real-time clock control chip by the CPU, avoiding the bulky volume which is brought to circuits by an additional EEPROM chip and the deficit that the circuit design is complicated. An automatic switch circuit of the current supply of the power supply realizes automatic switch between the main power source and the emergency battery, thus greatly increasing the number of the periphery components, saving the space of the circuit board, being convenient to the miniaturization of the equipment.
Description
Technical field
The utility model relates to a kind of clock circuit, specifically, relates to a kind of control circuit of real-time clock.
Background technology
Real-time timepiece control circuit is as the time control circuit in the system, and the quality of its performance directly has influence on the quality of whole system.General real-time timepiece control circuit peripheral components is many, function is simple, can only carry out simple Time Calculation and the output of reporting to the police, it is big that complicated circuit takies circuit board space, the cost height, and present real time clock circuit itself does not have memory space, can not store data, can only be stored by external eeprom chip, more strengthened taking up room of circuit board, be difficult in other system integrated.In addition, present real-time timepiece control circuit does not have power supply power supply automatic switch-over circuit, and under the situation that adopts the compatible power supply of main power source and reserve battery, the power supply design is very complicated.
Summary of the invention
The utility model is many in order to overcome in the prior art real-time timepiece control circuit peripheral components, complex circuit designs, and self can not store the deficiency of data, a kind of integrated level height is provided, the real-time timepiece control circuit that function is stronger, with less peripheral circuits and easily the bus configuration mode make circuit design and parameter configuration simple and convenient, reliable and stable performance has effectively ensured the trouble free service of whole system.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of real-time timepiece control circuit, comprise main power source, reserve battery and a real-time clock control chip, described real-time clock control chip includes power input and cell input terminal, link to each other with reserve battery with described main power source respectively, by the power supply switch circuit that its inside carries, realize the automatic switchover between main power source and the reserve battery; The external crystal oscillator of described real-time clock control chip for it provides reference clock, and passes through the control of portion's register within it of its output and exports interrupt signal or frequency signal down.
In addition, described real-time clock control chip also includes I
2The C bus input end is through I
2The C bus links to each other with CPU, carries out real time communication; The model of described real-time clock control chip is X1226V8.
Compared with prior art, advantage of the present utility model and good effect are: the utility model replaces traditional clock circuit by adopting a real-time clock control chip, and 512 * 8 memory spaces that utilize its inside to carry pass through I
2The C bus realize its with CPU between communicate by letter, finish the setting of CPU to the real-time clock control chip, avoided adding eeprom chip to circuit bring bulky, the deficiency of line design complexity; Its power supply power supply automatic switch-over circuit has been realized the automatic switchover between main power source and the reserve battery, has significantly reduced the quantity of peripheral component, has saved the space of circuit board, is convenient to the miniaturization of equipment.
Description of drawings
Fig. 1 is the concrete circuit connection diagram of the utility model real-time timepiece control circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Among Fig. 1, NB12 is real-time clock control chip X1226V8 of the present utility model, and XTAL1 is the external crystal oscillator of 32.768KHz.The Vback end of described real-time clock control chip X1226V8 is the reserve battery input, and the anodal output voltage of reserve battery BT1 is coupled after capacitor C B95 and CB94 filtering.Main power source+3.3V voltage is sent into the power input Vcc of real-time clock control chip X1226V8 after capacitor C B91 filtering.The voltage of reserve battery input Vback and power input Vcc is discerned under the control of commutation circuit automatically in inside, switch voluntarily, when power input Vcc had voltage, reserve battery input Vback disconnected, by the main power source power supply, prolong the operating time of battery; When power input Vcc did not have voltage, reserve battery was its power supply, guaranteed the clock control circuit non-stop run, guaranteed the accuracy of time.The two ends of crystal oscillator XTAL1 link to each other with X1, the X2 end of real-time clock control chip X1226V8 respectively, and for circuit working provides reference clock, capacitor C B92, CB93 are the matching capacitance of brilliant shake, guarantee that brilliant shake is operated under the specific frequency.PHZ/IPQ# is interrupt signal output or frequency signal output, and specific interrupt signal or the frequency signal of output uses for external devices by resistance R B67, RB68 under the control of internal register.SDA, the SCL end of real-time clock control chip X1226V8 is I
2The C bus input end links to each other with CPU by resistance R B69, RB70 respectively, passes through I
2The parameter of C bus setting chip.
The utility model is by adopting the foregoing circuit structure, with lower cost with dispose the controlled function that has realized real-time clock easily, reduced the usage quantity of peripheral component, simplified circuit design, is convenient to the miniaturization of equipment.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (3)
1. real-time timepiece control circuit, comprise main power source and reserve battery, it is characterized in that: in described clock control circuit, also include a real-time clock control chip, described real-time clock control chip includes power input and cell input terminal, link to each other with reserve battery with described main power source respectively, by the power supply switch circuit that its inside carries, realize the automatic switchover between main power source and the reserve battery; The external crystal oscillator of described real-time clock control chip for it provides reference clock, and passes through the control of portion's register within it of its output and exports interrupt signal or frequency signal down.
2. real-time timepiece control circuit according to claim 1 is characterized in that: described real-time clock control chip also includes I
2The C bus input end is through I
2The C bus links to each other with CPU, carries out real time communication.
3. real-time timepiece control circuit according to claim 1 and 2 is characterized in that: the model of described real-time clock control chip is X1226V8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041374 CN2701170Y (en) | 2004-06-18 | 2004-06-18 | A real-time clock control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041374 CN2701170Y (en) | 2004-06-18 | 2004-06-18 | A real-time clock control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2701170Y true CN2701170Y (en) | 2005-05-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420041374 Expired - Fee Related CN2701170Y (en) | 2004-06-18 | 2004-06-18 | A real-time clock control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2701170Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299618B (en) * | 2008-06-25 | 2012-05-09 | 上海闻泰电子科技有限公司 | Real time clock circuit of intelligent mobile phone |
| CN104731162A (en) * | 2013-12-18 | 2015-06-24 | 成都蓉威电子技术开发公司 | Realization method for self-locking and automatic activation of real-time clock |
| CN108733135A (en) * | 2018-05-17 | 2018-11-02 | 佛山华芯微特科技有限公司 | Extremely low power dissipation real time clock circuit and control method |
-
2004
- 2004-06-18 CN CN 200420041374 patent/CN2701170Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299618B (en) * | 2008-06-25 | 2012-05-09 | 上海闻泰电子科技有限公司 | Real time clock circuit of intelligent mobile phone |
| CN104731162A (en) * | 2013-12-18 | 2015-06-24 | 成都蓉威电子技术开发公司 | Realization method for self-locking and automatic activation of real-time clock |
| CN108733135A (en) * | 2018-05-17 | 2018-11-02 | 佛山华芯微特科技有限公司 | Extremely low power dissipation real time clock circuit and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |