CN201956970U - Temperature compensation type crystal oscillator - Google Patents
Temperature compensation type crystal oscillator Download PDFInfo
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- CN201956970U CN201956970U CN2011200887708U CN201120088770U CN201956970U CN 201956970 U CN201956970 U CN 201956970U CN 2011200887708 U CN2011200887708 U CN 2011200887708U CN 201120088770 U CN201120088770 U CN 201120088770U CN 201956970 U CN201956970 U CN 201956970U
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- type crystal
- crystal oscillator
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Abstract
The utility model discloses a temperature compensation type crystal oscillator which is characterized in that an AFC (automatic frequency control) end of a chip acts as a clock signal in a communication protocol, a Q end acts as a data signal in the communication protocol and realizes temperature compensation, and after communication, the Q end is switched to output for regularly outputting needed frequency. The temperature compensation type crystal oscillator can realize communication of the temperature compensation type crystal oscillator with less than 6 PIN pins. As the PIN pins only less than 6 are used to realize the communication method, general bases can be used as the bases of PIN pins, rather than being customized, therefore, the production cost is lowered and the production efficiency is enhanced.
Description
Technical field
The utility model relates to a kind of temp. compensation type crystal oscillator.
Background technology
Temp. compensation type crystal oscillator (TCXO) is made up of a crystal and a chips.In the inside of chip a series of controllable electric capacity or di-cap and amplifier circuit are arranged, add a crystal again and just form an effective oscillation circuit, the frequency of oscillator is exactly that resonance frequency by oscillation circuit is determined.The temperature inductor of chip internal is used for detecting crystal variations in temperature on every side.Based on this temperature, but chip can be according to the query performance standard that is stored in its internal oscillator loop, and the arrangement by electric capacity increases or reduce capacitance.Another kind of mode is, but chip can be regulated the variable capacitance diode in the oscillation circuit according to the query performance standard that is stored in its internal oscillator loop.Fig. 1 (prior art) is the standard P AD function that illustrates prior art.As shown in Figure 1, uppermost 2 PAD are used for connecting crystal.Some other PAD(is as VDD and GND) need to give the TCXO chip that power supply is provided.Q is the clock output PAD of oscillator.AFC is the input PAD of control frequency, and this PAD is used for finely tuning the frequency of TCXO output.A serial clock port (SCK) is connected to the clock of TCXO chip internal, is used for the transmission of synchrodata.A serial data port (SI/SO) is used to the chip internal that reads and writes data.Generally speaking TCXO is as a kind of device of frequency of operation accurately.In case frequency is determined, the TCXO chip all needs calibration in order to reach needed precision within the temperature range of whole-40 to 85 degree so.Outside calibration system will be put into a whole set of canonical parameter to the EEPROM of chip or the ROM of the rewritable of other types, this can open or close a series of electric capacity or the voltage of adjusting di-cap is in order to adapt to different temperature, detects the output frequency of TCXO again at the Q end.Each temperature spot of temperature inductor comes to this measured and record in the chip.A serial clock port (SCK) and a serial data port (SI/SO) are used to realize the adjustable parameter of Communication Control with the TCXO chip.The data of final calibration are written among the EEPROM or the ROM of the rewritable of other types in the chip, as the portion data of tabling look-up, thereby finish the step of calibration.So aforesaid temperature correction process is 8 PAD of the minimum needs of technology TCXO chip before.In order to obtain 8 or the oscillator ceramic base of more PAD, oscillator manufacturer must have base made to order.So this base is very expensive and the tailor-made cycle can be for a long time.
The utility model content
The utility model purpose is: a kind of temp. compensation type crystal oscillator that can carry out communication with 6 or following PIN pin is provided.
The technical solution of the utility model is: a kind of temp. compensation type crystal oscillator, comprise the IC chip, the crystal oscillation sheet, base and crown cap, described IC chip is positioned on the base, described crystal oscillation sheet is positioned on the IC chip and with described crown cap and covers, and it is characterized in that the port number of described temp. compensation type crystal oscillator is not more than 6.
Further, described IC chip built-in has can read the frequency counter of the frequency in the oscillator in the temperature correction process.
Further, the port number of described temp. compensation type crystal oscillator is 4.
Further, described 4 ports are respectively AFC end, vdd terminal, GND end and Q end.
Operation principle: with the port one of chip as the clock signal in the communications protocol; Port two is realized temperature-compensating as the data signals in the communications protocol; After communication was finished, port two ends were switched into output, were used for fixing the required frequency of output.Further, the AFC with chip holds as the clock signal in the communications protocol; The Q end is realized temperature-compensating as the data signals in the communications protocol; After communication was finished, the Q end was switched into output, was used for fixing the required frequency of output.Further, substitute the AFC end as the clock signal in the communications protocol with vdd terminal.Further, described AFC end and Q end, when chip powers on for the first time, be all input state, by communications protocol temperature compensation data is input in the oscillator core circuit, the feedback signal that obtains from core circuit is through the calculating of frequency counter, from the output of Q end, come the result comparison result whether correct, through adjustment comparison repeatedly, final result is latched in oscillator core circuit the inside, reaches the purpose of temperature-compensating; Temperature-compensating by communications protocol, is input in the oscillator core circuit after regulating and finishing again, and core circuit produces signal IOC is switching to output state, Q end clock signal from the frequency output circuit.
The utility model has the advantages that:
Owing to adopt the PIN pin that only uses below 6 to realize the mode of communication, make the base of PIN pin can be suitable for universal base, thereby do not need tailor-made base, reduced production cost, improved the efficient of producing.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a kind of communication modes of existing temp. compensation type crystal oscillator.
Fig. 2 is the communication modes of temp. compensation type crystal oscillator of the present utility model.
Fig. 3 is the communication modes of temp. compensation type crystal oscillator of the present utility model.
Fig. 4 is the communicating circuit figure of temp. compensation type crystal oscillator of the present utility model.
Fig. 5 is the chip input/output control circuit figure of temp. compensation type crystal oscillator of the present utility model.
Fig. 6 is the chip input/output control circuit control program flow chart of temp. compensation type crystal oscillator of the present utility model.
Embodiment
Embodiment one: as shown in Figure 2, SCK and AFC end combines and is DFR(numerical frequency read write line) provide reference clock simultaneously this clock also as the data wire of communication.The input and output that SI/SO and Q combine to data provide FPDP.The frequency of TCXO is to measure by the DFR in the chip, and like this output frequency of TCXO is not connected to the Q end, so can not measure by the equipment of outside such as the frequency counter in the temperature calibration system etc.Such method needs the communication modes of 6 PIN pin to realize temperature-compensating.
Embodiment two: shown in Figure 4 as Fig. 3, these two PAD of AFC and Q, AFC are as the clock signal in the communications protocol, and Q holds as the data signals number in the communications protocol, realize temperature-compensating.The Q end was switched into output after communication was finished, the required frequency of fixing output.AFC and Q when chip powers on for the first time, are all input state, by communications protocol temperature compensation data is input in the oscillator core circuit, whether the feedback signal that obtains from core circuit from the output of Q end, comes the result comparison result correct through the calculating of frequency counter.Compare through adjustment repeatedly by this way, final result is latched in oscillator core circuit the inside, reach the purpose of temperature-compensating.Temperature-compensating again by specific communications protocol, is input in the oscillator core circuit after regulating and finishing, and core circuit produces signal IOC is switching to output state.Q end clock signal from the frequency output circuit.As Fig. 5, shown in Figure 6, during operating state, at first IC powers on.IC power on back control signal 1 shutdown signal 1 passage and start pull-up resistor, the passage of control signal 2 shutdown signals 3, the Q end is in input state.Q end and AFC end is by communications protocol then, and the register of oscillator core circuit is carried out the temperature-compensating setting.After the setting of temperature-compensating register is finished, control signal 2 is opened, Q holds no longer input signal and is in output state, signal 3 is outputed to the Q end, whether correct, if incorrect, return previous step if being used for checking temperature-compensating to set, proceed compensation making, all set until all temperature-compensating registers and finish.After all temperature-compensating registers were all set and finished, control signal 2 was closed, and Q holds the no longer waveform of output signal 3, and control signal 1 is opened the clock signal of Q end output fixing signal 1 and pull-up resistor is closed.
Above embodiment only is the utility model a kind of execution mode wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be with claims.
Claims (4)
1. temp. compensation type crystal oscillator, comprise the IC chip, the crystal oscillation sheet, base and crown cap, described IC chip is positioned on the base, described crystal oscillation sheet is positioned on the IC chip and with described crown cap and covers, and it is characterized in that the port number of described temp. compensation type crystal oscillator is not more than 6.
2. temp. compensation type crystal oscillator according to claim 1 is characterized in that, described IC chip built-in has can read the frequency counter of the frequency in the oscillator in the temperature correction process.
3. temp. compensation type crystal oscillator according to claim 2 is characterized in that, the port number of described temp. compensation type crystal oscillator is 4.
4. temp. compensation type crystal oscillator according to claim 3 is characterized in that, described 4 ports are respectively AFC end, vdd terminal, GND end and Q end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200887708U CN201956970U (en) | 2011-03-30 | 2011-03-30 | Temperature compensation type crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200887708U CN201956970U (en) | 2011-03-30 | 2011-03-30 | Temperature compensation type crystal oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201956970U true CN201956970U (en) | 2011-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200887708U Expired - Fee Related CN201956970U (en) | 2011-03-30 | 2011-03-30 | Temperature compensation type crystal oscillator |
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| Country | Link |
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| CN (1) | CN201956970U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130680A (en) * | 2011-03-30 | 2011-07-20 | 苏州麦格芯微电子有限公司 | Temperature compensation type crystal oscillator and communication method thereof |
-
2011
- 2011-03-30 CN CN2011200887708U patent/CN201956970U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130680A (en) * | 2011-03-30 | 2011-07-20 | 苏州麦格芯微电子有限公司 | Temperature compensation type crystal oscillator and communication method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20180330 |