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

HAL 302x is a fast 2D angular position sensor family, designed for stray-field robust motor position sensing and ISO 26262-compliant development. The family comprises two members that measure the vertical magnetic field component (B_Z) using Hall-effect technology. The HAL 3021 is distinguished by enhanced robustness against both static and dynamic mechanical tolerances.

The family provides differential or single-ended sine and cosine analog outputs with integrated wire-break detection; the rotation angle of a magnet is calculated externally by an A/D converter and a microcontroller/ECU. An array of Hall plates suppresses external magnetic stray fields by design, so a simple two-pole magnet in an end-of-shaft configuration is sufficient to measure absolute angular position - the magnet may be placed above or below the sensor. The Hall-plate array measurement principle also minimizes errors due to supply voltage and temperature variations.

Major characteristics such as sine and cosine gain, offset, (absolute) 0angle, orthogonality and bandwidth can be adjusted via the integrated signal path by programming the device’s nonvolatile memory. HAL 302x is defined as Safety Element out of Context (SEooC) ASIL C ready according to ISO 26262:2018 and includes onboard diagnostics such as overvoltage and undervoltage detection and wire-break monitoring during normal operation. The device is designed for automotive and industrial applications and operates in an ambient temperature range of −40 °C to +150 °C. The sensor is available in an SOIC8 SMD package.