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Hall sensors offer accuracy for automotive apps

Posted: 04 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Hall-effect sensors? Hall sensors? automotive applications?

Hall-effect sensors from Micronas

Micronas has announced the HAL 82x family of programmable Hall-effect sensors designed to meet the latest accuracy requirements of many automotive applications.

Like its predecessors, the HAL 82x has an integrated EEPROM to store the sensor parameters. This EEPROM is robust and reliable, even at the allowed maximum junction temperature of 170C.

Multiplexed analog output
The sensor's high accuracy is based on the 14bit signal path, the integrated digital signal processing and the ratiometric 12bit analog output. The sensor also features a multiplexed analog output. With this new, patent-pending output format, the 12bit DAC of the HAL 82x achieves the actual resolution of a 14bit converter, while avoiding the small quantization intervals. This delivers an excellent SNR on the output, the company said.

Micronas said its designers had put extra effort into minimizing the drift of sensitivity and offset over the temperature range. This guarantees long-term stability of the main parameters, which helps to ensure the car's optimum performance for many years. The differential non-linearity (DNL) is below one LSB. ESD is a severe issue in automotive applications and the 4kV rating of the HAL 82x surpasses other existing linear Hall sensors, according to the company.

Automobile trouble-shooting and repair is enhanced by an integrated wire break detection system. This makes it easy for the engine control computer to detect and report problems with the car's wiring.

"We designed the HAL 82x to meet the increasing demands on engine management in the automotive industry. Ever more accurate readings of key vehicle parameters means lower emissions and better fuel economy," says Peter Zimmermann, market manager automotive at Micronas. "The sensor offers highest precision to meet the requirements of next-generation throttle valve position sensors. This reduces pollutant and CO2 emissions."

Other applications
Other target applications include linear movement measurement, flow measurement, position detection and contactless potentiometers.

Micronas offers a development board for design and production of the Hall sensors. The required software is available for free.

The RoHS-compliant HAL 82x is available in the TO 92UT package, suitable for overmolding, and operates at ambient temperatures between -40C and 150C.

Depending on the product type, the HAL 82x is available at a price between $1.90 and $2.20. Samples will be available July 2007.

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