The direction of the temperature sensor

In the electronics industry, sensor based components is very important, widely used in aerospace, military, industrial, household appliances, automotive electronics, information and medical equipment and other fields, especially in recent years, with the spread of the concept of Internet of things, the sensor of demand growth potential are look good.

in accordance with the purpose to distinguish, the sensor can be roughly divided into the pressure sensor, temperature sensor, flow sensor, level sensor, wireless sensors, biosensors and so on. In various types of sensor, according to INTECHNO consulting firm, temperature sensor accounts for about more than 15% of the total demand for the sensor, dosage for the largest sensor.

in the direction of the digital temperature sensor development to observe the temperature sensor, the latest development of ADI precision ADC Wei Ke product line application manager said: 'compared with the traditional product, new type of temperature sensor presents the development trend of miniaturization, high precision, low power consumption, etc. . 'According to this development trend, ADI has provided a series of high precision, low cost of digital temperature sensor, Wei Ke pointed out that this series of temperature sensor using the I2C or SPI interface, for more complex system design application, you can use the internal integration with DAC, ADC, reference source and digital temperature sensor threshold warning register.

ADI precision ADC product line application manager Wei Ke

in this series, ADT7420 and ADT7320 is two digital temperature sensor, high accuracy, low drift can be - 20 ˚ C to 105 ˚ C + + 025 ˚ C within the temperature range of accuracy, in - 40 ° C to + 125 ° C temperature range is + 05 DHS C precision. Wei Ke and stressed that, unlike other solutions, digital temperature sensor ADT7420 and ADT7320 but plug and play, no additional signal disposal or calibration. ADI and provides a complete range of analog temperature sensor. In terms of price, Wei Ke said: 'the temperature sensor as a highly competitive market, the product price is at a very low level. '

in fact using MEMS technology to reduce volume, the industry remains committed to offer the price lower temperature sensor. Such as Texas instruments ( TI) In the middle of the year issued by non contact infrared temperature sensor chip TMP006, its price is down to 18 125 compared with the existing temperature sensor. In addition, the TMP006 packaging area is reduced by 95%, power consumption is reduced by 90%. It is known that TI this temperature sensor is shrinking the size, is mainly due to the integration of the thermopile sensor by MEMS technology.

due to the decrease in the volume, the application scope of passive infrared temperature sensor to the industrial field extends to smart phones, tablets, laptops and other portable products, measure the casing temperature. Is different from the traditional way attached to the outside, the temperature sensor for the welding on the PCB directly, because the sensors can be set in the hottest place close to the system, thus can provide more accurate temperature measurement.

Texas instruments, audio video products surface temperature, the electric flu and Gamma measurement buffer product marketing manager Daniel Mar and said, there have been several consumer electronics companies plan to innovative ways to apply the MEMS infrared temperature sensor in its products. The TMP006 16 mm x 16 mm single chip integration including MEMS thermopile sensor, signal regulating function, 16 bit ADC, local temperature sensor and all kinds of voltage reference, high integration degree, can provide complete digital for non-contact temperature measurement solutions.

basically, temperature is the most common physical quantity being measured, as a result, in addition to the independent existence of the temperature sensor, more can see sensing of temperature sensor are integrated to other products, such as vibration monitor ADI's newly minted ADIS16228, this product will be transformed MEMS accelerometer with a programmable embedded processing capacity of 3 axis vibration analyzer, which integrate the digital temperature sensor. Overall, the development of the temperature sensor is from the traditional analog sensor to digital, to facilitate further consolidation and provide data processing function.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor