19-06-2012, 02:04 PM
Implementation of IEEE Smart Sensor Using FPGA
Implementation of IEEE .docx (Size: 168.18 KB / Downloads: 59)
INTRODUCTION:
This paper presents a method to connect more number of sensors in IEEE1451 standard using FPGA. IEEE 1451 is the IEEE Standard for a Smart Transducer designed and then used in a smart sensor Interface for Sensors and Actuators—Common Functions,Communication Protocols, and Transducer Electronic Data Sheet (TEDS) Formats This standard is approved on 9 August 2007 by American National Standards Institute and IEEE-SA Standards Board on 22 March 2007. It reduces the complexities in establishing digital communication with transducers and actuators. STIM specified in the IEEE 1451.2-1997 standard (IEEE Standard for a Smart Transducer Interface for Sensors and Actuators Transducer to Microprocessor Communication Protocols and Transducer Electronic Data Sheet - Approved 16 September 1997 by IEEE Standards Board ) is referred as TIM in this standard. Under IEEE 1451, a sensor is divided into two parts: a Smart Transducer Interface Module (STIM) contains the sensing element, the appropriate signal-conditioning circuits, and A/D converter, plus a Transducer Electronic Data Sheet (TEDS), a memory chip that identifies the type of sensor, its make and model, its calibration information, its scale factor, and more.In this work, a VLSI model of a IEEE1451.2 STIM has been without network capability.
TEDS-Transducer Electronic Data Sheet.It is a part of the STIM.The TEDS contains fields that fully describe the type,operation, and attributes of the transducer.
A transducer is an electronic device that converts energy from one form to another. Common examples include microphones, loudspeakers, thermometers, position and pressure sensors, and antenna. signal conditioning means manipulating an analog signal in such a way that it meets the requirements of the next stage for further processing. Most common use is in analog-to-digital converters.Signal conditioning can include amplification, filtering, converting, range matching, isolation and any other processes required to make sensor output suitable for processing after conditioning. Signal amplification performs two important functions: increases the resolution of the inputed signal, and increases its signal-to-noise ratio. For example, the output of an electronic temperature sensor, which is probably in the millivolts range is probably too low for an Analog-to-digital converter (ADC) to process directly. In this case it is necessary to bring the voltage level up to that required by the ADC. Commonly used amplifiers on signal conditioning include Sample and hold amplifiers, Peak Detectors, Log amplifiers, Antilog amplifiers, Instrumentation amplifiers or programmable gain amplifiers.Using STIM we can connect more no of sensors and it works based on the priority.The above two are advantages of STIM.