單片機(jī)及溫濕度傳感器的發(fā)展外文翻譯

1、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 sta

2、ge, main is to seek out the monolithic forms of the embedded system best system structure. “Innovation mode“ success, laid the SCM and general computer completely different development road. (2) MCU namely Micro Controll

3、er (Micro Controller Unit) stage, the main technological development direction is: expanding meet embedded application, the object system requirements of various peripheral circuit and interface circuit, dash forward sho

4、w 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 maximization of the so

5、lution; 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

6、larger development.Temperature is a basic physical quantities, everything in nature is closely related with the process of temperature. The temperature sensor is the earliest development, the most widely used kind of sen

7、sor. From 17 th century people began to use temperature measuring. The temperature sensor there are four main types: thermocouple, thermal resistance, resistance temperature detector (RTD) and temperature sensor IC. IC t

8、emperature 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 trans

9、mission 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 thermo

10、meter can also be measuring 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 con

11、tent being saved, has been frozen, SCM all work stop, until the next an interrupt or hardware reset so far.2.Integrated temperature sensorAD590Integrated temperature sensor AD590 to, its temperature resolution for the 0.

12、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, and once

13、every change, the output current change 1 microamps, the temperature sensor of working temperature range is-30 degrees-150 degrees. If use AD590 to make the temperature sensor, sensor peripheral circuit is simple, just p

14、ut sampling resistance and AD590 to link and then to amplify the signal, and then using voltage comparator compared to output voltage, voltage comparator output signals can be directly as PLC the input signal.3.Humidity

15、sensor There are many ways of measuring the air humidity, its principle is based on certain material from the surrounding air absorb water caused by physical or chemical properties of the change, indirectly from the mate

16、rial of water quantity and the surrounding air humidity. Capacitive and resistive and wet go up wet type according to its original susceptibility were macromolecule material moisture absorption after the dielectric const

17、ant and resistivity and volume change and humidity measurementSolution a: the HOS-201 wet sensors. HOS-201 wet sensor for high humidity sensor switches, it's the job of the voltage of ac 1 V the following, frequency

18、for frequency 50 HZ ~ 1 KHZ, humidity measurement range of 0 ~ 100% RH, working temperature range is 0 ~ 50 ℃, impedance in 75% RH (25 ℃) for 1 M Ω. The sensor is used to switch the sensor, not on the wideband range dete