Smart Temperature Sensor To The Direction Of The Rapid Development Of High Technology

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Three modern information technology based information collection (ie, Sensor Technology), information transmission ( Communicate Technology) and information processing (computer technology). Sensor Belongs to the forefront of cutting-edge information technology products, especially the temperature sensors are widely used in industrial and agricultural production, scientific research and areas of life, the number of ranking first in all kinds of sensors.

The 21st century, high-precision smart temperature sensor is moving, multi-functional, bus standards, high reliability and security, development of virtual sensors and network sensors, temperature measurement systems, single-chip high-tech development direction of the rapid development of .

1 to improve temperature measurement accuracy and resolution

The mid 90s in the 20th century, the first launch of the smart temperature sensor uses a 8 A / D converter, the low temperature measurement accuracy, resolution can only reach 1 . At present, many foreign countries have also launched high accuracy, high resolution intelligent temperature sensor is used in 9 to 12-bit A / D converter resolution generally up to 0.5 ~ 0.0625 . DALLAS Semiconductor, Inc. by the United States developed a new type of high-resolution intelligent DS1624 temperature sensor that can output 13-bit binary data, the resolution as high as 0.03125 , measurement accuracy is 0.2 . In order to improve multi-channel temperature sensor conversion rate, and some chip high-speed successive approximation A / D converter. For AD7817 5-channel temperature sensor, for example, its local sensors, remote sensors each way conversion time was only 27 s, 9 s.

2 increased testing capabilities New intelligent temperature sensor test capability is also growing. For example, DS1629 temperature sensor to increase type single intelligent 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, the smart temperature sensor is moving from single to multi-channel direction, which for the research and development of multi-temperature control system has created favorable conditions.

Smart temperature sensor has a variety of operating modes, including single conversion mode, continuous conversion mode, standby mode, and some increase in the low temperature limit expansion mode, the operation is very simple. Some smart temperature sensor, the host (external microprocessor or microcontroller) can also register to set its corresponding A / D conversion rate (typical products MAX6654), resolution and maximum conversion time (typical products DS1624).

Intelligent temperature controller is based on the Intelligent Temperature Sensor evolved. Typical products DS1620, DS1623, TCN75, LM76, MAX6625. Intelligent Temperature Controller Adapter various micro-controllers, intelligent temperature control system constituted; they can also be separate from the micro-controller to work on their own to form a temperature controller.

3 bus technology, standardization and standardization

Present, intelligent temperature sensor bus technology to achieve a standardized, using mainly one-way bus (-Wire) bus, I2C Bus, SMBus bus and spI bus.

4 reliability and safety design

Traditional A / D converter they use a more integral or successive conversion technology, low noise tolerance, suppress aliasing noise and relatively poor ability of quantization noise. Intelligent Temperature Sensor (for example TMP03/04, LM74, LM83) commonly used by high-performance type - A / D converter, it can sample the high sampling rate and low resolution analog signals into digital signal, and then use oversampling, noise shaping and digital filtering techniques to improve the effective resolution.

by: fdgbg

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