【School】 Intelligent Temperature Controller weak new trend】.

<br> <BR> into the 21st century, is moving in high-precision smart temperature controller, multi-functional, bus standard, high reliability and security, development and network virtual temperature controller temperature controller, developed single-chip temperature measurement .temperature control system, the rapid development of high-tech direction. .An improved temperature controller temperature measurement accuracy and resolution in the 20th century, first introduced in the mid-90s intelligent temperature controller, using 8-bit A / D converter, the low temperature measurement accuracy, resolution can only reach 2 ° .C. . At present, foreign countries have launched a variety of high-precision, high resolution intelligent temperature sensor is used in 9 to 12-bit A / D converter, the general resolution of up to 0.5 ~ 0.0625 ° C. . In order to improve multi-channel intelligent temperature conversion rates, and some chip high-speed successive approximation A / D converter. .Increase the temperature controller features 2 new intelligent temperature controller test test function is also growing. .For example, the use of smart temperature sensor DS1629-type single increase in the real-time calendar clock (RTC), to function more perfect. .DS1624 also increased the storage capabilities, the use of 256 bytes of E2PROM chip memory, can store the user's text messages. .In addition, intelligent temperature controller is moving from single to multi-channel direction, which for the research and development of multi-channel temperature control system has created good conditions. .Intelligent temperature controller is available with a variety of operating modes, including single conversion mode, continuous conversion mode, standby mode, and some also increased the low temperature limit expansion mode, operation is very simple. .Some intelligent temperature controller, the host (an external microprocessor or microcontroller) can also register to set its corresponding A / D conversion rate, resolution and the maximum conversion time. .<BR> <BR> 3 temperature controller bus technology standardization and standardization at present, intelligent temperature controller, temperature sensor bus technology to achieve the standardization, using the bus are single (1-Wire) bus, I2C .Bus, SMBus bus and spI bus. .Temperature sensor used as a slave can be through a dedicated bus interface for communication with the host. .4 temperature controller design reliability and safety of traditional A / D converter they use integral or successive approximation conversion technique, the noise margin is low, inhibition of aliasing noise and quantization noise of the capacity is relatively poor. .New Intelligent temperature controller commonly used high-performance type Σ-Δ A / D converter, it can lower the high sampling rate and sampling resolution analog signals into digital signals, then use oversampling, noise .shaping and digital filtering techniques to improve the effective resolution. .Σ-Δ type A / D converter can not only filter out quantization noise and the accuracy of the external components that require low; the use of digital feedback mode, the comparator offset voltage and zero temperature drift will not affect the conversion accuracy. .The smart temperature controller both series mode interference suppression capability, high resolution, good linearity, and low cost. .In order to avoid interference by the noise temperature control system malfunction arising in AD7416/7417/7817, LM75/76, MAX6625/6626 internal temperature sensors and other intelligent, have set a programmable "fault line (fAultqueue)" .counter, dedicated to setting allows the measured temperature exceeds the lower limit of the number of times. .Only when the measured temperature of the upper or lower limit exceeded the number of times meet or exceed the set number of times n (n = 1 ~ 4) when the client can trigger the interrupt. .If the number of failures does not meet the above conditions are not continuous or fault occurs, the fault counter to reset and will not interrupt client. .This means that assuming n = 3, then the chance of noise interference by one or two, will not affect the temperature control system to work properly. .<BR> ACPI (AdvAnced ConfigurAtion And Power InterfAce, the "Advanced Configuration and Power Interface") standard temperature control system. .This system has perfect thermal protection, can be used to monitor the laptop computer and the server CPU and the main circuit temperature. .Microprocessor can withstand the highest operating temperature of the provisions of tH, desktop computer usually 75 ° C, high-end notebook computers dedicated CPU up to 100 ° C. . Once the CPU or the main circuit exceeds the set temperature, the lower limit, INT interrupt the host side immediately, and then send a signal through the power controller to quickly turn off the main power supply for protection. .In addition, when the temperature exceeds the limits of CPU temperature, a serious super can also directly off the main power, and the client can also independent of the hardware to cut off the main power circuit in case the main power of control. .Triple security protection measures mentioned above have become international design a new concept of temperature control system. .To prevent the human body electrostatic discharge (ESD) and damage to the chip. .Some intelligent temperature controller has also increased the ESD protection circuits can typically withstand 1000 ~ 4000V ESD voltage. .The body is usually equivalent to the 100PF capacitor and 1.2K ohm resistor in series circuit model, when the body discharge, TCN75 intelligent temperature sensor serial interface port, interrupt / comparator output signal and address inputs are .ESD withstand voltage of 1000V. .<BR> <BR> 5 virtual temperature controller temperature controller and the network (1) <BR> virtual virtual temperature controller temperature controller temperature controller is based on the hardware and computer platforms and software to develop. .Temperature controller using software to complete the calibration and calibration to achieve optimal performance. .Recently, the U.S. B & K has developed a software-based set of Virtual TEDS sensor, its main feature is the product of each sensor has a unique serial number and comes with a floppy disk, floppy disk storing the calibration of the sensor .relevant data. .When used, the sensor data acquisition by computers connected to the first input of the sensor from the computer serial number, and then read out from the floppy disk data, then automatically check the sensor, the sensor reads the parameters, sensors and record set .work. . (2) Network <BR> temperature controller includes digital temperature controller is the network sensors, network interfaces and processing units of the new generation of intelligent temperature controller. .First, it will be measured by digital temperature sensor into a digital number, and then sent to the microcontroller for data processing. .Finally, the measurement results transmitted to the network in order to achieve between the various sensors, between sensors and actuators, sensors and data exchange between systems and resource sharing in the replacement of sensors without the need for calibration and calibration can be "plug and .that use (Plug & PlAy) ", thus greatly facilitate the users. .6 temperature controller chip temperature control system <BR> SoC (System On Chip) is a 21st century high-tech products. .It is integrated on the chip of a system or subsystem, the integrated components will be as high as 108 ~ 109 / piece, which will bring IC industry and IC applications epoch-making progress. .Semiconductor Industry Association (SIA) on-chip system integration forecasts in Table 1. .At present, some well-known international manufacturers have started to develop the IC chip temperature measurement system that can be available in the near future. .<BR> Table 1 predict the development of integrated circuit chip system <BR> Year ----------------- 2001 ----- 2002 ------ 2007 - .- 2010 <BR> minimum line width / um ----------- 0.18 ----- 0.13 ------ 0.1 ----- 0.07 <BR> contains the number of transistors / chip .------ 1.3X108 - 2.5X108-- 5X108 --- 9X108 <BR> cost / (transistors / mm cents) --- 0.2 0.1 ------- ------ .0.05 ---- 0.02 <BR> chip size / mm2 ----------- 750 ----- 900 --- ---- 1100 ---- 1400 <BR> supply voltage / .V ------------- 1.8 ----- 1.5-- ---- 1.2 ----- 0.9 <BR> chip I / O number ------- .------ 2000 ---- 2600 ------- 3600 --- 4800 <BR>.