CN101603853B - Special integrated circuit for electronic scale - Google Patents
Special integrated circuit for electronic scale Download PDFInfo
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- CN101603853B CN101603853B CN2009101005196A CN200910100519A CN101603853B CN 101603853 B CN101603853 B CN 101603853B CN 2009101005196 A CN2009101005196 A CN 2009101005196A CN 200910100519 A CN200910100519 A CN 200910100519A CN 101603853 B CN101603853 B CN 101603853B
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Abstract
The invention discloses a special integrated circuit for an electronic scale. In the same chip, not only a reinforced type 8051 microprocessor is integrated, but also the following parts are embedded: a real-time clock circuit used for recording and printing real-time weighing time and dates, an LED/LCD drive control logic used for displaying data related to the electronic scale, a high-precision analog to digital conversion circuit used for converting an analog weight signal outputted by a strain sensor into a digital signal, a calculating engine module used for quickly realizing the 24-bit signed multiplication-division by arithmetical operation of hardware, a reinforced type peripheral control logic which comprises two UART ports supporting infrared communication and RS232 communication and is used for communication of the electronic scale, and a temperature sensor used for realizing the comprehensive real-time temperature compensation for measuring precision. The special integrated circuit has the advantages of high measuring precision, good reliability, strong anti-jamming capability, low production cost and power consumption, miniaturization and the like.
Description
Technical field
The invention relates to a kind of integrated circuit, particularly a kind of special integrated circuit for electronic scale that adopts the SOC technical design.
Background technology
Electronic scale is to be related to the requisite special metering instrument that national economy develops in a healthy way and people's lives are normally carried out, brought into play increasing effect in the modern society that market economy is taken as the leading factor, along with its application in all trades and professions deepens continuously, also more and more higher simultaneously to the requirement of electronic scale product.
But present electronic scale integrated level is low, its secondary instrument part normally prime amplifier, low-pass filter, analog to digital converter, crystal oscillator, real-time clock, memory, display driver circuit, MCU etc. as individual components, the weak point of its existence: the one, system's interference free performance and poor reliability; The 2nd, the Weighing precision is influenced by ambient temperature big; The 3rd, the printed-wiring board (PWB) area occupied is big, and solder joint is many, the production cost height; The 4th, because number of devices is many, power consumption is bigger.
The further development trend of electronic scale is to merge measuring technology, control technology and computer technology, the communication technology, to intellectuality, and networked and small-sized and embedded development.This considers it problems such as a whole its function, reliability, cost, power consumption as a system with regard to requiring when designing electronic scale.Along with the development of VLSI (very large scale integrated circuit) technology, SOC technology and IP technology are more and more ripe, become the main flow design of IC industry gradually.SOC technology and IP The Application of Technology can improve design efficiency effectively, reduce the market risk, reduce the research and development expense, shorten the R﹠D cycle.Adopt the SOC technology to design electronic scale, can promote the miniaturization of electronic scale, improve reliability, lower power consumption and cost, become the developing direction of electronic scale of new generation.
Summary of the invention
For overcoming existing electronic scale control circuit above shortcomings, the purpose of the invention provides a kind of special integrated circuit for electronic scale based on SOC technology and IP technical design, it can promote the electronic scale miniaturization, improve the reliability of measuring accuracy and use, reduce production costs and power consumption.
The invention solves the technical scheme that its technical matters adopts, and it is integrated with on same semi-conductor chip:
Enhancement mode 8051 microprocessors are used for the computing and the control of whole electronic scale system;
LED/LCD drive controlling logic is used for the demonstration and the indication of required related data of electronic scale weight indicating value and various function and state symbol;
The high precision analogue change-over circuit comprises high-gain low-noise amplifier, Sigma-Delta modulator, digital filter, and the simulation weight signal that strain gauge transducer is exported converts digital signal to;
The computation engine module utilizes hardware to carry out 24bits multiplication and division arithmetical operation, realize fast 24 with 24 have sign multiplication and 48 with 24 the symbol division arranged, be used for the computing etc. of filtering, computing, calibration and other function of electronic scale of weight signal;
60 byte data memory blocks are EEROM Nonvolatile data memory units, are used for the storage of electronic scale systematic parameter and weight calibration factor;
Two full duplex serial ports UART universal synchronous/asynchronous reception/transmitters that dispose in the enhancement mode peripheral logic, be used between the electronic scale system or with the communication of external unit or computer;
Programmable pulse width control circuit PWM that disposes in the enhancement mode peripheral logic and programmable frequency generator F.Gen, the control and the realization of the electronic scale subsidiary function that is used to use always;
Built-in real-time clock RTC circuit, the real-time clock the leap month of providing automatic leap year for system;
Temperature sensor is made of TS temperature/freq converting circuit, and the temperature of system's environment of living in is provided in real time, is used for the temperature characterisitic of the weight measurement of electronic scale complete machine is carried out comprehensive compensation.
Described enhancement mode 8051 microprocessors dispose 8/16 ALU, 256 byte inner SRAM, 768 byte external SRAM and 8K byte program memory block E
2PROM, special function register and extended register, three 8/16 bit timing/counters, a WatchDog Timer and three external interrupt; Adopt super instruction flow line line architecture, the equal following 8 times of speed of dominant frequency situation are in standard 8051 microprocessors; Built-in serial online programming logical circuit can be realized user's in-system programming ISP.
Described LED/LCD drive controlling logic is integrated two kinds of display drive control circuits of LCD, LED can arbitrarily be selected by control pin high-low level; The LED display drive control circuit is 21com * 8seg, and comprises 8 grades of LED intednsity circuits; The LCD display drive control circuit can be configured to 8com * 21seg or 4com * 21seg drive pattern by software, supports 1/4duty, 1/3bias display mode.
Described high precision analogue change-over circuit includes high-gain low-noise amplifier, adopts the Sigma-Delta modulator and the digital filter on two rank; Sample frequency can be 30Hz by software setting, 15Hz, 7.5Hz and 3.75Hz; Effectively the conversion figure place reaches more than 15.
Described two full duplex serial ports UART wherein UART0 can be 38KHz modulation of infrared rays communication pattern by software arrangements.
Described temperature sensor can also be used for the LOAD CELLS of real-time clock, weighing system, high precision analogue change-over circuit are carried out real-time temperature characteristic compensation, improves the precision that the simulation part is measured, and reduces the influence of temperature to measurement result.
After adopting above-mentioned design, following advantage and effect are arranged compared with prior art:
The one, improve the chip performance index, SOC is that the angle from total system designs, the complicacy of simplified system has been accelerated the speed of data transmission and processing, can realize more high performance system index under identical process conditions.
The 2nd, improve anti-electromagnetic interference (EMI) and system reliability.The system signal that embedded circuit is caused in the time of can reducing even avoid circuit board signal to transmit is crosstalked.
The 3rd, improved measuring accuracy, sheet is embedded in temperature sensor, can carry out comprehensive temperature compensation to total system, also can carry out the real time temperature characteristic compensation to real-time clock, LOAD CELLS, high precision analogue change-over circuit, can improve the precision that the simulation part is measured greatly, reduce the influence of temperature, improve the precision of total system measurement result.
The 4th, improved the function and application scope of electronic scale, because this SOC supports online programming ISP, this field-programmable and resource repeated configuration technology carry out the electronic scale design for the deviser and exploitation provides available up-to-date means; Adopt Reprogrammable technology in the sheet, make the function of the interior hardware of SOC (system on a chip) to dispose by programming as software, thereby can carry out in real time changing flexibly and easily and developing, even can in system's operational process, dispose again, make identical hardware realize different functions, improved the efficient of system by the different periods; This brand-new system design notion, make the electronic scale of a new generation have extremely strong dirigibility and adaptability, it not only makes the improvement of the design of electronic system and exploitation and properties of product and expansion becomes very simple and easy and convenient, and makes electronic system have the multi-functional ability of adaptation.
The 5th, reduce cost, reduce chip volume, reduce shared printed circuit board space, the integrated system of chip is equivalent to parts or a complete machine, certainly will reduce the volume of complete machine.
The 6th, reduce power consumption, by the system level power consumption management, software code optimization, clock control, rtl code optimization, and the rear end is comprehensive and Wiring optimization etc. can greatly reduce the power consumption of whole SOC.
Description of drawings
Fig. 1 is the invention system chart.
Embodiment
Shown in Figure 1, specific embodiments for the invention special integrated circuit for electronic scale, it is integrated with on the semiconductor chip: enhancement mode 8051 microprocessors, LED/LCD drive controlling logic, by high-gain low-noise amplifier, the Sigma-Delta modulator, the high precision analogue change-over circuit that digital filter etc. are formed, the computation engine module, the peripheral steering logic of enhancement mode, PF1 detects logic, temperature sensor, serial online programming logic, real time clock circuit, power control circuit, the system power-on reset circuit, the oscillator logic circuit, global clock etc.
Enhancement mode 8051 microprocessors adopt cisc instruction set enhancement mode 51 kernels of present comparative maturity, and kernel is little, the logic small scale, and instruction is abundant, and register and SRAM visit are efficient and convenient.For improving the execution efficient of cisc instruction, compress tradition 8051 instructions significantly and carried out required machine cycle number, and three grades of instruction flow line line architectures have been adopted, finally reaching all one-byte instructions can finish in the cycle at individual machine, makes the average execution speed of call instruction reach 8 times more than of equal crystal oscillator frequency tradition 8051.This provides sound assurance for reducing power consumption and electromagnetic interference (EMI), and for reaching same computing and handling property, required dominant frequency greatly reduces, and power consumption and electromagnetic radiation significantly reduce.
LED/LCD drive controlling logic is used for the demonstration and the indication of required related data of electronic scale weight indicating value and various function and state symbol; This logical circuit is integrated two kinds of display drive control circuits, the LED display drive control circuit is 21com * 8seg, refreshing frequency is 100Hz, and comprises 8 grades of adjustable LED intednsity circuits; The LCD display drive control circuit can be configured to 8com * 21seg or 4com * 21seg drive pattern by software, and refreshing frequency is 27Hz, supports 1/4duty, 1/3bias display mode.In order to improve reliability and to use conveniently, hardware controls is adopted in the selection that LED and LCD drive.
The high precision analogue change-over circuit comprises high-gain low-noise amplifier, Sigma-Delta modulator and digital filter, is used for converting the simulation weight signal of strain gauge transducer output to digital signal.
High-gain low-noise amplifier, be used to gather the output signal of LOAD CELLS,, generally arrive between several mV at uV because the input signal of external sensor is fainter, therefore chip provides a high-gain low-noise amplifier, and it is amplified to the range of signal that rear end ADC can discern.Active low-pass filter in the amplifier in order to avoid produce aliasing effect, causes the distortion of AD sampled result with the high frequency noise filtering.
The Sigma-Delta modulator adopts two contrast systems, carries out quantization encoding according to the last sampled value and the difference of back one sampled value, and promptly the envelope shape of signal carries out quantization encoding; It has adopted the 1bit quantizer, is suitable for very much the MOS technology and realizes; It has adopted high sampling rate and Sigma-Delta modulation technique, can obtain very high resolution; It adopts low level to quantize, can be too inresponsive to the changes in amplitude of input signal.Therefore the Sigma-Delta modulator is actually the high sampling rate of a kind of usefulness and exchanges the high quantization position for, is particularly suitable for being applied in the electronic scale metering.
Digital filter, the dc shift that is used for pair amplifier and modulator circuit compensates and data calibration; The special digital signal processing unit of integrated 24bits bit wide is realized the dc shift bias compensation of high-precision adc and the calibration of data in the chip.Utilize the peculiar technology of digital processing, reach long situation stabilization time, increased distinctive filtering and quickened treatment circuit, make wave filter reach and significantly shorten stabilization time at low-pass filter.
The computation engine module utilizes hardware to carry out 24bits multiplication and division arithmetical operation, realizes that fast have sign multiplication and 48 figure places of 24 figure places and 24 figure places have a symbol division divided by 24 figure places; Multiplication or division arithmetic only need 26 and 51 machine clock cycles respectively, and arithmetic speed can improve tens of times, effectively improves the data-handling capacity of SOC, have also reduced arithmetical operation subroutine taking the program space simultaneously.
The enhancement mode peripheral logic comprises two full duplex asynchronous communication port UART and circuit such as PWM, F.Gen.Consider and now the communication function of electronic scale is more and more paid attention to, designed the multifunctional serial port of two enhancement mode.The count rate that general 8051 timers are used for frequency generator is 12 frequency divisions of system clock, when the serial ports rate setting is higher, selection to system clock frequency will have higher requirements, for example system clock is 10MHz, baud rate is 9600bps, SMOD=1, the timing accuracy error that calculates is 8.51%, the communication correctness of serial ports will be had a greatly reduced quality, at having increased an extra function in this characteristics chip, can by the count rate of software set timer system clock frequency, such benefit is that the timer count rate has improved 12 times, still be example with top example, the timing accuracy error that calculates is 0.15%, satisfies the serial communication requirement fully.In the intensified multifunction serial ports, be the infrared communication pattern but a software arrangements is arranged, its serial delivery outlet can be realized the carrier wave ASK modulation required to infrared communication automatically, but and modulating frequency software set.Infrared communication can be advantageously used in remote control and PDA communication, can further expand the range of application of electronic scale, improves the class of product.
The brightness adjustment of LED-backlit when pulse-width modulation circuit PWM able to programme can be used for liquid crystal display also can be used for some topworkies or control analog quantity output as digital to analog converter.
Programmable frequency generator F.Gen can directly drive passive hummer with different frequencies, also can be used to control of controlling some performance element such as DC generator speed etc.
Temperature sensor can provide the temperature of system's environment of living in real time, and electronic scale is carried out comprehensive compensation.Described temperature sensor can also be used for operational amplifier, real-time clock, LOAD CELLS, high precision analogue change-over circuit, oscillator logic are carried out in real time or section linear compensating, can improve the precision that the simulation part is measured greatly, reduce the influence of temperature, improve the precision of total system measurement result.
Integrated 8Kbytes Flash ROM on the chip, 60bytes EEROM, 4bytesChip ID and can carry out repeatedly erasable in-system programming interface ISP to these nonvolatile memories.By I/O pin multiplexing technology, serial i SP interface does not almost completely take any external resource of chip, and user friendly greatly system design is used, as upgrade maintenance in the future.But in-system programming code encipherment protection; in case and encrypted bits is enabled, the EEROM of 60bytes, also simultaneously protected with the Chip ID of 4bytes; high safe and secret rank can be realized by the software cooperation, user's specialized knowledge property right can be effectively protected.
The design adopts the E of 0.35um
2The technology flow shows after engineering is criticized test manufacture and test, has reached the target of design substantially.The Dice area is less than 16mm
2, be lowered into system cost greatly; The SOC total power consumption has reduced system power dissipation less than 75mW; Effectively the ADC figure place reaches 15, meets three grades of needed standards of electronic scale.The system of whole electronic scale only needs IC of SOC just can realize functions such as measurement, demonstration, control, data transmission, and because real-time clock is arranged, more help measuring, control, the fusion of communication and computer technology, more easy exploiting goes out to meet the various intelligence and the high-precision electronic scale product of international most advanced level.
Claims (6)
1. special integrated circuit for electronic scale is characterized in that: be integrated with on same semi-conductor chip:
Enhancement mode 8051 microprocessors are used for the computing and the control of whole electronic scale system;
LED/LCD drive controlling logic is used for the demonstration and the indication of electronic scale weight indicating value;
The high precision analogue change-over circuit comprises high-gain low-noise amplifier, Sigma-Delta modulator, digital filter, and the simulation weight signal that strain gauge transducer is exported converts digital signal to;
The computation engine module utilizes hardware to carry out 24bits multiplication and division arithmetical operation, realize fast 24 with 24 have sign multiplication and 48 with 24 the symbol division arranged, be used for filtering, computing and the calibration of weight signal;
60 byte data memory blocks are EEROM Nonvolatile data memory units, are used for the storage of electronic scale systematic parameter and weight calibration factor;
Two full duplex serial ports UART universal synchronous/asynchronous reception/transmitters that dispose in the enhancement mode peripheral logic, be used between the electronic scale system or with the communication of computer;
Programmable pulse width control circuit PWM that disposes in the enhancement mode peripheral logic and programmable frequency generator F.Gen; The brightness adjustment of LED-backlit when programmable pulse width control circuit PWM is used for liquid crystal display; Programmable frequency generator F.Gen directly drives passive hummer with different frequencies, or is used for the control of DC generator speed;
Built-in real-time clock RTC circuit, the real-time clock the leap month of providing automatic leap year for system;
Temperature sensor provides the temperature of system's environment of living in real time, is used to realize the temperature characterisitic of the weight measurement of electronic scale complete machine is carried out comprehensive compensation.
2. special integrated circuit for electronic scale according to claim 1 is characterized in that:
Described enhancement mode 8051 microprocessors dispose 8/16 ALU, 256 byte inner SRAM, 768 byte external SRAM and 8K byte program memory block E
2PROM, special function register and extended register, three 8/16 bit timing/counters, a WatchDog Timer and three external interrupt; Adopt super instruction flow line line architecture, the equal following 8 times of speed of dominant frequency situation are in standard 8051 microprocessors; Built-in serial online programming logical circuit can be realized user's in-system programming ISP.
3. special integrated circuit for electronic scale according to claim 1 is characterized in that: described LED/LCD drive controlling logic is integrated two kinds of display drive control circuits of LCD, LED, can arbitrarily select by control hardware pin high-low level; The LED display drive control circuit is 21com * 8seg, and comprises 8 grades of LED intednsity circuits; The LCD display drive control circuit can be configured to 8com * 21seg or 4com * 21seg drive pattern by software, supports 1/4duty, 1/3bias display mode.
4. special integrated circuit for electronic scale according to claim 1 is characterized in that: include high-gain low-noise amplifier in the described high precision analogue change-over circuit, adopt the Sigma-Delta modulator and the digital filter on two rank; Sample frequency can be 30Hz by software setting, 15Hz, 7.5Hz and 3.75Hz; Effectively the conversion figure place reaches more than 15.
5. special integrated circuit for electronic scale according to claim 1 is characterized in that: described two full duplex serial ports UART universal synchronous/asynchronous reception/transmitters, wherein UART0 can be a 38KHz modulation of infrared rays communication pattern by software arrangements.
6. special integrated circuit for electronic scale according to claim 1 is characterized in that: described temperature sensor is used for the LOAD CELLS of real-time clock, weighing system, high precision analogue change-over circuit are carried out real-time temperature characteristic compensation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101005196A CN101603853B (en) | 2009-07-03 | 2009-07-03 | Special integrated circuit for electronic scale |
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| CN2009101005196A CN101603853B (en) | 2009-07-03 | 2009-07-03 | Special integrated circuit for electronic scale |
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| CN101603853A CN101603853A (en) | 2009-12-16 |
| CN101603853B true CN101603853B (en) | 2011-05-18 |
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| CN102573113A (en) * | 2010-12-27 | 2012-07-11 | 北京中电华大电子设计有限责任公司 | SoC (system-on-chip) chip structure of wireless local area network |
| WO2017138164A1 (en) * | 2016-02-08 | 2017-08-17 | 三菱電機株式会社 | Controller and conveyance system |
| CN107505010A (en) * | 2017-10-16 | 2017-12-22 | 上海御渡半导体科技有限公司 | A kind of infrared test mechanism for surface-mounted integrated circuit |
| CN113168450A (en) * | 2018-12-03 | 2021-07-23 | 惠普发展公司，有限责任合伙企业 | Logic circuitry packaging |
| CN114801527A (en) * | 2022-05-31 | 2022-07-29 | 江南大学 | Ink-jet printing control system and method |
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