TAILIEUCHUNG - Newnes Sensor Technology Handbook P2

Sensor Fundamentals Digital techniques have become increasingly popular in processing sensor outputs in data acquisition, process control, and measurement. Generally, 8-bit microcontrollers (8051-based, for example) have sufficient speed and processing capability for most applications. By including the A/D conversion and the microcontroller programmability on the sensor itself, a “smart sensor” can be implemented with self-contained calibration and linearization features, among others. A smart sensor can then interface directly to an industrial network as shown in Figure . The basic building blocks of a “smart sensor” are shown in Figure , constructed with multiple ICs. The Analog Devices MicroConverter™-series of products includes. | Sensor Fundamentals Digital techniques have become increasingly popular in processing sensor outputs in data acquisition process control and measurement. Generally 8-bit microcontrollers 8051-based for example have sufficient speed and processing capability for most applications. By including the A D conversion and the microcontroller programmability on the sensor itself a smart sensor can be implemented with self-contained calibration and linearization features among others. A smart sensor can then interface directly to an industrial network as shown in Figure . The basic building blocks of a smart sensor are shown in Figure constructed with multiple ICs. The Analog Devices MicroConverter -series of products includes on-chip high performance multiplexers analog-to-digital converters ADCs and digital-to-analog converters DACs coupled with Flash memory and an industrystandard 8052 microcontroller core as well as support circuitry and several standard serial port configurations. These are the first integrated circuits which are truly smart sensor data acquisition systems high-performance data conversion circuits microcontroller Flash memory on a single chip see Figure . Figure Standardization at the digital interface using smart sensors. 19 Chapter 1 Microcontroller Sensor Figure Basic elements in a smart sensor. 20 CHAPTER Application Considerations Jon Wilson Technical Editor The highest quality most up-to-date most accurately calibrated and most carefully selected sensor can still give totally erroneous data if it is not correctly applied. This section will address some of the issues that need to be considered to assure correct application of any sensor. The following check list is derived from a list originally assembled by Applications Engineering at Endevco in the late 1970s. It has been sporadically updated as additional issues were encountered. It is generally applicable to all sensor applications but many of the items mentioned .

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