CN102857197B - A kind of calibration steps improving built-in RC oscillator frequency precision - Google Patents
A kind of calibration steps improving built-in RC oscillator frequency precision Download PDFInfo
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- CN102857197B CN102857197B CN201210354473.2A CN201210354473A CN102857197B CN 102857197 B CN102857197 B CN 102857197B CN 201210354473 A CN201210354473 A CN 201210354473A CN 102857197 B CN102857197 B CN 102857197B
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Abstract
The present invention relates to a kind of calibration steps improving built-in RC oscillator frequency precision, it is characterized in that: described calibration steps is applied to the calibration of main control chip docking port chip frequency, be equipped with crystal oscillator outside described main control chip, described interface chip is built-in with RC oscillator; This calibration steps comprises the following steps: step S001: described main control chip is measured the RC frequency of oscillation of described interface chip or cycle, calculates correction value through this main control chip; Step S002: by the interface chip described in described correction value write, thus realize the correction to the frequency of oscillation of described interface chip.Method of the present invention, when not increasing chip cost, is revised the error that technique produces, is reached high-precision object.
Description
Technical field
The present invention relates to the calibration steps of the built-in RC oscillator frequency of integrated circuit (IC) chip.
Background technology
There are some such application systems in electronic product, except host CPU, also have some interface chip inside to need clock, and the precision to clock frequency had, stability have higher requirement.Now have two schemes to adopt, one is this interface chip also external crystal oscillator, can obtain very high precision, but chip needs many extractions two pins, and the cost of application system can be higher; Another kind of way is the built-in RC oscillator of interface chip, and this scheme cost is very low, does not increase number of pins, but the precision of RC oscillator and stability are not high.The method that tradition improves RC vibration precision is in chip production process, carries out middle survey before encapsulation, and carries out fine setting correction by the method for laser lithography to R or C in nude film.The method requires necessarily there is middle survey in chip production process, and according to test result, chip is revised one by one, and therefore testing cost is higher, and this scheme of chip for low value cannot receive.
Summary of the invention
The object of the invention is when not increasing chip cost, the error that technique produces is revised, improve the precision of chip internal frequency.
The present invention adopts following scheme to realize: a kind of calibration steps improving built-in RC oscillator frequency precision, it is characterized in that: described calibration steps is applied to the calibration of main control chip docking port chip frequency, be equipped with crystal oscillator outside described main control chip, described interface chip is built-in with RC oscillator; This calibration steps comprises the following steps:
Step S001: described main control chip is measured the RC frequency of oscillation of described interface chip or cycle, calculates correction value through this main control chip;
Step S002: by the interface chip described in described correction value write, thus realize the correction to the frequency of oscillation of described interface chip.
In an embodiment of the present invention, described main control chip is the method by adopting multiplex interface bus, measures the RC frequency of oscillation of described interface chip or cycle.
In an embodiment of the present invention, described interface bus comprises I2C interface bus, SPI interface bus or parallel interface bus.
In an embodiment of the present invention, the inside of described interface chip is integrated with Parasites Fauna, and described Parasites Fauna can carry out frequency division to the frequency of RC oscillator thus reduce the frequency of oscillation of this interface chip.
In an embodiment of the present invention, the inside of described interface chip is integrated with Parasites Fauna, and described Parasites Fauna, by the value of analog switch control R or C, realizes the object improving frequency of oscillation.
In an embodiment of the present invention, the specific implementation process of described step S001 and step S002 is as follows: first described main control chip sends out control command to described interface chip, after described interface chip receives order, interpreted command also enters frequency measurement pattern, now SDA holding wire is set to the way of output, and the output pulse of RC oscillator is exported by SDA interface, automatically terminate this process after certain special time; After described main control chip is given an order, by IO mode, SCL holding wire is set to low level, and start pulse frequency or the pulse period of testing SDA holding wire, and calculate correction value, then pass through I2C interface by the interface chip internal register group described in correction value write, thus realize the correction to the frequency of oscillation of described interface chip.
In an embodiment of the present invention, described interface chip is a face control chip that can complete LED display driver, keyboard scan identification, timing start-up, button start, infrared remote control power up function.
In an embodiment of the present invention, utilize infrared remote control to receive line IR and realize frequency measurement, calibrating frequency function, the specific implementation process of described step S001 and step S002 is as follows: described main control chip sends out an order to described face control chip, described face control chip is allowed to enter frequency measurement state, what then now IR line transmits is the oscillating pulse wave of described face control built-in chip type RC oscillator, after described main control chip has been tested, send out an order again to described face control chip, allow described face control chip exit frequency measurement state; After described main control chip sends frequency measurement order, frequency measurement is carried out to IR line, and calculate corresponding correction value; After frequency measurement terminates, main control chip sends out an order allows described face control chip exit frequency measurement state, and sends out the correction value of an order write frequency again, thus realizes the correction of the frequency of oscillation to described control chip.
The present invention has following beneficial effect:
1, the number of pins of described interface chip can be reduced, so the cost even reducing described interface chip can not be increased;
2, do not increase the cost of electronics applications system, do not increase lead-in wire, do not increase components and parts, side is convenient just realizes the frequency precision of oscillation improving built-in RC oscillator.
3, use, wide application, is applicable to need in the various interface chips of high accuracy operating frequency.
4, the technique of chip is had no special requirements, be applicable in polytechnic chip.
Accompanying drawing explanation
Fig. 1 is the inventive method schematic flow sheet.
Fig. 2 is application system interface relationship schematic diagram of the present invention.
Fig. 3 is the built-in RC oscillator of embodiment of the present invention interface chip and Parasites Fauna relation schematic diagram.
Fig. 4 is the built-in RC oscillator of another embodiment of the present invention interface chip and Parasites Fauna relation schematic diagram.
Fig. 5 is that the present invention realizes the example schematic of frequency measurement, calibrating frequency with multiplexing I2C bus mode.
Fig. 6 is the example schematic that the multiplexing infrared remote control of the present invention receives that line realizes frequency measurement, calibrating frequency.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, the present embodiment provides a kind of calibration steps improving built-in RC oscillator frequency precision, it is characterized in that: described calibration steps is applied to the calibration of main control chip docking port chip frequency, be equipped with crystal oscillator outside described main control chip, described interface chip is built-in with RC oscillator; This calibration steps comprises the following steps:
Step S001: described main control chip is measured the RC frequency of oscillation of described interface chip or cycle, calculates correction value through this main control chip;
Step S002: by the interface chip described in described correction value write, thus realize the correction to the frequency of oscillation of described interface chip.
Concrete, be briefly described below in conjunction with the annexation of chip chamber and working method, please refer to Fig. 2, Fig. 2 is application system interface relationship schematic diagram of the present invention, described main control chip is the method by adopting multiplex interface bus, measures the RC frequency of oscillation of described interface chip or cycle.This interface bus comprises I2C interface bus, SPI interface bus or parallel interface bus.Please refer to Fig. 3, Fig. 3 is the built-in RC oscillator of interface chip of the present invention and Parasites Fauna relation schematic diagram.In figure, the inside of this interface chip is integrated with Parasites Fauna, and described Parasites Fauna can carry out frequency division to the frequency of RC oscillator thus reduce the frequency of oscillation of this interface chip.Please refer to Fig. 4, Fig. 4 is the built-in RC oscillator of another embodiment interface chip and Parasites Fauna relation schematic diagram, and the Parasites Fauna described in this embodiment, by the value of analog switch control R or C, realizes the object improving frequency of oscillation.
Be the example that a multiplexing I2C bus realizes frequency measurement, calibrating frequency continue referring to Fig. 5, Fig. 5.Described main control chip is connected by I2C interface bus with described interface chip.During calibrating frequency, first described main control chip sends out control command to described interface chip, after described interface chip receives order, interpreted command also enters frequency measurement pattern, now SDA holding wire is set to the way of output, and the output pulse of RC oscillator is exported by SDA interface, automatically terminate this process after certain hour.After described main control chip is given an order, by IO mode, SCL holding wire is set to low level, and starts pulse frequency or the pulse period of testing SDA holding wire.Described main control chip is by frequency measurement or survey frequency of oscillation or the cycle that periodic mode can calculate the built-in RC oscillator of described interface chip, corresponding correction value can be calculated by the frequency of oscillation or cycle of measuring the built-in RC oscillator obtained, and by I2C interface by the interface chip internal register group described in correction value write, then described interface chip just can obtain high-precision operating frequency.The precision of the operating frequency obtained and the figure place of correction value are closed, and the more general precisions of figure place are higher.In addition, similar interface mode can also be SPI interface, UART interface, parallel bus interface etc.
Please refer to Fig. 6, Fig. 6 is the interface mode of a face control chip and described main control chip, and this face control chip can complete LED display driver, keyboard scan recognition function, can realize timing start-up, button start, infrared remote control power up function etc.So face control chip needs the operating frequency of a high stability, generally control chip in this face needs an external crystal oscillator just can reach the precision of time, as have employed the technology of patent of the present invention, utilize built-in RC oscillator equally can realize high accuracy and walk time function, realize the function of timing start-up.In such a system, infrared remote control can be utilized to receive line IR and to realize frequency measurement, calibrating frequency function.In figure, described main control chip and this face are controlled chip and the various interface mode such as I2C, SPI can be adopted to be connected, and also have an IR line to be connected in addition, as shown in Figure 5.In such a system, directly utilize infrared remote control to receive line IR and realize frequency measurement, calibrating frequency function, operation is by convenient, simple.During frequency measurement, described main control chip sends out an order to described face control chip, described face control chip is allowed to enter frequency measurement state, what then now IR line transmits is the oscillating pulse wave of described face control built-in chip type RC oscillator, after described main control chip has been tested, send out an order again to described face control chip, allow described face control chip exit frequency measurement state.After described main control chip sends frequency measurement order, frequency measurement is carried out to IR line, and calculate corresponding correction value.After frequency measurement terminates, send out an order and allow described face control chip exit frequency measurement state, and send out the correction value of an order write frequency again, the operating frequency of face control chip described like this can be improved significantly.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (1)
1. one kind is improved the calibration steps of built-in RC oscillator frequency precision, it is characterized in that: described calibration steps is applied to the calibration of main control chip docking port chip frequency, be equipped with crystal oscillator outside described main control chip, described interface chip is built-in with RC oscillator; This calibration steps comprises the following steps:
Step S001: described main control chip is measured the RC frequency of oscillation of described interface chip or cycle, calculates correction value through this main control chip;
Step S002: by the interface chip described in described correction value write, thus realize the correction to the frequency of oscillation of described interface chip;
The inside of described interface chip is integrated with Parasites Fauna, and described Parasites Fauna can carry out frequency division to the frequency of RC oscillator thus reduce the frequency of oscillation of this interface chip;
The inside of described interface chip is integrated with Parasites Fauna, and described Parasites Fauna, by the value of analog switch control R or C, realizes the object improving frequency of oscillation;
The specific implementation process of described step S001 and step S002 is as follows: first described main control chip sends out control command to described interface chip, after described interface chip receives order, interpreted command also enters frequency measurement pattern, now SDA holding wire is set to the way of output, and the output pulse of RC oscillator is exported by SDA interface, automatically terminate this process after certain special time; After described main control chip is given an order, by IO mode, SCL holding wire is set to low level, and start pulse frequency or the pulse period of testing SDA holding wire, and calculate correction value, then pass through I2C interface by the interface chip internal register group described in correction value write, thus realize the correction to the frequency of oscillation of described interface chip;
Described main control chip is the method by adopting multiplex interface bus, measures the RC frequency of oscillation of described interface chip or cycle.
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| CN103698603B (en) * | 2013-12-27 | 2017-03-15 | 深圳芯邦科技股份有限公司 | A kind of chip and its clock test methodology and chip clock test system |
| CN104007313A (en) * | 2014-05-08 | 2014-08-27 | 深圳市硅格半导体有限公司 | Chip detection method and system in testing process |
| CN107219395B (en) * | 2017-05-23 | 2019-06-18 | 郑州云海信息技术有限公司 | A kind of detection method of RTC crystal oscillator |
| CN109143031A (en) * | 2018-08-06 | 2019-01-04 | 深圳市鑫研创科技有限公司 | The calibration method of wireless charging full-automatic testing mould group and wireless charging transmitter |
| CN111322916A (en) * | 2020-03-18 | 2020-06-23 | 融硅思创(北京)科技有限公司 | High-precision digital electronic detonator chip and method for improving detonator delay precision |
| CN113467570B (en) * | 2021-07-16 | 2024-02-09 | 无锡英斯特微电子有限公司 | Clock accurate calibration system and method for USB full-speed equipment chip |
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