The 2D sensors detect position for cars and machines. They work in magnetic fields and support different outputs for use in many system types.
TDK Corporation has introduced the HAL/HAR 35xy family of 2D Hall-effect position sensors, designed for use in automotive and industrial applications. These new sensors build on the success of the HAL/HAR 39xy series, offering a more streamlined feature set while maintaining high standards for performance and safety.
The 35xy series is optimized for mainstream applications that need reliable stray-field robust position detection but don’t require the full flexibility of the 39xy series. Key applications include accelerator and brake pedals, steering angle, valve and shift position, transmission detection, non-contact potentiometers, and chassis height measurement.
The first sensors in the series are the HAL 3550 (single-die) and HAR 3550 (dual-die for full redundancy). Both are ASIL C ready and designed as Safety Elements out of Context (SEooC), making them suitable for use in ISO 26262 compliant systems up to ASIL D.
These high-resolution sensors support 360° angular or linear magnetic position sensing. They offer analog outputs with passive wire-break detection, configurable PWM (0.1–2 kHz), or SENT outputs (with or without pause pulse, per SAE J2716 rev. 4). A switch output is also available, based on position, temperature, or magnetic-field amplitude, with user-defined thresholds and logic.
The sensors include a modulo function to split the 360° range into 90°, 120°, or 180° segments, ideal for chassis position sensing. Using Hall effect technology, they measure both vertical and horizontal magnetic field components, with strong immunity to stray fields—no need for complex magnets, just a simple two-pole ferrite magnet in an end-of-shaft setup.
On-chip processing calculates position from magnetic signals and converts it to analog or digital output. Parameters like gain, offset, and reference position can be programmed via non-volatile memory.
Operating between –40 °C and 150 °C, the sensors are available in SOIC8 (single-die) and TSSOP16 (dual-die) SMD packages.
