Slim-fit packaging for Hall-effect sensors

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

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.

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 dice significantly improves the correlation between the two output signals. The resulting improved sensitivity of the sensor enables a much smaller magnet design. The magnet is located closer to the sensor's active area which makes the overall design less sensitive to stray parasitic fields. Integration of two dice brings system redundancy at the supply and output levels.  

The HAR 24xy family members enable automotive electronics designers to develop robust sensor solutions with redundant capabilities while reducing their system costs.

The sensor’s high accuracy is based on a 16-bit signal path with an integrated digital signal core delivering a ratiometric 12-bit analogue (HAR 2425) or up to 2 kHz PWM (HAR 2455) output signal. Both versions include an output linearisation 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. 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.