仓库温湿度监控系统外文翻译_精品文档.docx

1、江汉大学毕业论文（设计）外文翻译姓 名 学 号 2012 年3 月 1 日外文原文Single chip microcomputer and the development of the temperature and humidity sensorBorn in the 1970 s single chip microcomputer, and experience the SCM, MCU, SOC three phases. (1) SCM namely Single Chip computer stage, main is to seek out the monolithic form

2、s of the embedded system best system structure. Innovation mode success, laid the SCM and general computer completely different development road. (2) MCU namely Micro Controller (Micro Controller Unit) stage, the main technological development direction is: expanding meet embedded application, the o

3、bject system requirements of various peripheral circuit and interface circuit, dash forward show its object the intelligent control ability. (3) MCU is embedded system independent development way, to a key factor to the development of MCU stage, is to seek application system on a chip in the maximiz

4、ation of the solution; Therefore, special MCU development natural form the SOC tendency. With microelectronics technology, IC design, EDA tools development, based on the single chip microcomputer application system SOC design can have larger development.Temperature is a basic physical quantities, ev

5、erything in nature is closely related with the process of temperature. The temperature sensor is the earliest development, the most widely used kind of sensor. From 17 th century people began to use temperature measuring. The temperature sensor there are four main types: thermocouple, thermal resist

6、ance, resistance temperature detector (RTD) and temperature sensor IC. IC temperature sensor and including analog output and digital output two types. Contact temperature sensor detection part and the tested object has a good contact, and calls the thermometer. The thermometer through the transmissi

7、on or convection reach thermal equilibrium, thus make the thermometer and value can be measured directly says the temperature of the objects. General measurement precision. In a certain temperature range, the thermometer can also be measuring objects of internal temperature distribution. But for spo

8、rts body, small target or heat capacity is very small objects will produce larger measurement error, commonly used a thermometer have two-metal thermometer, glass liquid thermometer, pressure type thermometer, resistance thermometers, thermistors and temperature difference electric dipole, etc. Cont

9、actless temperature sensor sensitive components and tested object each other is not contact, again say non-contact highlighted.it table. This instrument can be used to measure movement object, small goals and heat capacity small or temperature change quickly (transient) the surface temperature of th

10、e object, also can used for the measurement of the temperature distribution.1.AT89S52 devices profileThe main performance: and MCS-51 SCM products compatible, and 8 K bytes in the system programmable Flash memory, 1000 time period, and the static integration.it operation: 0 Hz 33 Hz, level 3 encrypt

11、ion program memory, 32 programmable I/O mouth line, three 16 timer/counters, eight interrupt source, full-duplex UART serial channel, low power dissipation power lost mode, and free after power off interrupt can wake up, the watchdog timer, double data pointer, off the identifier.Functional characte

12、ristics description: AT89S52 devices is a low power, high-performance CMOS 8-bit microcontrollers, with 8 K in system programmable Flash memory. Atmel company use high-density nonvolatile technology manufacturing, and industry 80 C51 product instructions and pin fully compatible. Chip Flash allow pr

13、ogram memory in the system programmable, also suitable for conventional programming console. In a single chip, with clever 8 bits CPU and in the system programmable Flash, make AT89S52 devices for many embedded control system to provide high flexible application, super efficient solution. AT89S52 de

14、vices has the following standard function: 8 k bytes Flash, 256 bytes RAM, 32 bit I/O mouth line, the watchdog timer, two data pointer, three 16 timer/counter, a 6 vector level 2 interrupt structure, full-duplex serial mouth, within crystals of timely clock circuit. In addition, AT89S52 devices can

15、be down to 0 Hz series static logic operation, support two software can choose power saving mode. Idle mode, the CPU to stop working, and allow RAM, timer/counter, serial ports, interrupt continue to work for. Power lost protection ways, a RAM content being saved, has been frozen, SCM all work stop,

16、 until the next an interrupt or hardware reset so far.2.Integrated temperature sensorAD590Integrated temperature sensor AD590 to, its temperature resolution for the 0.3 degrees Celsius. The analog signal is output AD590 to, when the temperature of 0 degrees, output current 273.2 microamps, and current variation and temperature variation in a linear relationship, temperature, an