Fast Stray-Field Robust Motor Position Sensor Family with Analog Output

HAL 302x is a fast 2D angular position sensor family addressing the need for stray-field robust motor position sensing as well as the ISO 26262 compliant development. This new sensor family features differential or single-ended sine and cosine analog outputs with integrated wire-break detection. The rotation angle of a magnet can be calculated by an external A/D-converter and a microcontroller/ECU. This new family has two members. Both members measure, based on Hall-effect technology, vertical magnetic-field components (B_Z). Speciality of HAL 3021 is that the device offers a higher robustness against static and dynamic mechanical tolerances.

Both devices are able to suppress external magnetic stray fields by using the array of Hall plates. Only a simple two-pole magnet in an end-of-shaft configuration is required to measure the absolute angular position. The magnet can be placed above or below the sensor.

The measuring principle of the Hall-plate array minimizes errors due to supply voltage and temperature variations.

Major characteristics like sine and cosine gain, offset, (absolute) 0-angle, orthogonality  and bandwidth can be adjusted using the integrated signal path by programming the non-volatile memory of HAL 302x.

This product is defined as Safety Element out of Context (SEooC) ASIL C ready according to ISO 26262:2018. HAL 302x contains on-board diagnostic features, such as overvoltage and undervoltage detection as well as wire-break monitoring during normal operation. The device is designed for automotive and industrial applications. It operates in the ambient temperature range from –40 °C to 150 °C. The sensor is available in the eight-pin SOIC8 SMD package.