Sensor brings third dimension to angle measurement

January 24, 2013 // By Christoph Hammerschmidt
Micronas expands its HAL 36xy sensor family for multidimensional magnetic field measurement based on the 3D HAL technology by the new model HAL 3675. This sensor family enables the measurement of magnetic fields in parallel to the chip surface by the use of vertical Hall plates. Application fields are mostly in the realm or automotive electronics.

Compared to conventional Hall sensors, which only allow measurements orthogonal to the sensor plane (Z axis), this technology enables the detection of an additional spatial component (X or Y axis). The combination of these two magnetic field vectors and the following signal processing make direct detections of rotation angles at the end or beside a turning shaft possible, as well as linear distance measurements up to ± 20 mm. In contrast to widely used Hall sensors, mechanical tolerances usually leading to air gap variations are compensated by the special measurement method of the 3D HAL technology. The vertical Hall plates of Micronas are produced in a standard CMOS process without any special postprocessing offering high quality products with high reliability – especially for the demanding automotive market.

The HAL 3675 offers direct angle detections from 0° up to 360° and – compared to previous family members – delivers the angle value as pulsewidth-modulated (PWM) output signal. The integrated signal processing can be programmed by the customer for each of the two channels separately, e.g. regarding parameters sensitivity, offset, or phase. Thus, the HAL 3675 is suitable for applications, which require high reliability or high temperatures up to 165° C. Therefore, the HAL 3675 is an ideal solution for every kind of position and angle detection using flaps or valves in automotive applications. It can be used for throttle position measurement, exhaust gas recirculation, turbo charger, steering angle and many other applications.

The HAL 3675 is initially available in the SMD package SOIC8 and operates reliably over the junction temperature range of TJ = –40 °C up to +170 °C.

For more information visit http://www.micronas.com/en