Slim-fit diet for Hall-effect sensors

February 12, 2015 // By Christoph Hammerschmidt
Hall-effect sensors in a package thinner than 1 mm is what Micronas is offering with its new HAR 24xy product family. These sensors will address automotive and industrial applications like throttle position detection or exhaust gas recirculation (EGR), but also for all kinds of current measurement and position detection.

For these applications, the very thin TSSOP14 package brings several benefits: It perfectly fits into space-demanding applications with reduced air gap. The small distance between the hall plates of the dies significantly improves the correlation between the two output signals. The resulting improved sensitivity of the sensor enables a much smaller magnet design. Furthermore, the magnet is located closer to the sensor's active area which makes the overall design less sensitive to stray parasitic fields. What's more, the integration of two dies brings system redundancy at the supply and output levels.  

The HAR 24xy family members enable automotive electronics designers to develop extremely robust sensor solutions with redundant capabilities allowing at the same time to significantly reduce their system costs, the vendor advertises.

The new products in this family, the HAR 2425 and HAR 2455, are integrating two automotive qualified dies in a TSSOP14 package thinner than 1 mm for high-precision redundant measurements and smaller magnet designs.

The sensor’s high accuracy is based on a sophisticated 16-bit signal path with an integrated digital signal core delivering a ratiometric 12-bit analog (HAR 2425) or up to 2 kHz PWM (HAR 2455) output signal. Both versions include an output linearization compensation function using 16 programmable set points to correct magnet linearity errors or to increase distance measurements. Enhanced detection functions and error diagnostic coverage offer numerous capabilities including wire break detection and thermal supervision in the case of overcurrent or short circuit events. Furthermore, the entire sensor signal path and the memory map are supervised by a continuous self-test of various circuit blocks.

To ease design and production activities there is a development board available together with LabView based programming software.

The sensors will be presented to the public at Embedded World (hall 4A, booth 500). First samples are available in May 2015. Start of production is planned for the second half of the year.

For more information, visit www.micronas.com/sales.