Stray-Field Robust 3D Position Sensors with Analog/PWN/SENT Interfaces

HAL 3550 and HAR 3550 are a new generation of 2D position sensors from TDK-Micronas addressing the need for stray-field robust position sensors (linear and angular) as well as the ISO 26262 compliant development.

This new generation builds upon the well known HAL/HAR/HAC 39xy family.
HAL/HAR 3550 is targeting mainstream applications requiring a device with a core feature set and less flexibility without making compromises on functional safety and performance.

HAL 3550 and HAR 3550 can measure a 360° angular range as well as linear movements.
Both devices feature a linear, ratiometric ana­log output with passive wire-break detection, as well as configurable PWM or SENT outputs.
The SENT mode supports messages with or without pause pulse, adhering to SAE J2716 rev. 4 standard with customizable parameters such as tick time and frame format.
The PWM output offers flexibility with frequencies rang­ing from 0.1 kHz to 2 kHz.
In addition a switch output derived from calculated position infor­mation or other sources along the signal path is available as an additional output signal.

All devices offer setpoint linearization with either 17 equidistant setpoints or 7 setpoints with variable distance / step size between the setpoints.

The sensors measure the position of a magnet based on 3D HAL technology from TDK‑Micronas.
The devices are able to suppress external magnetic stray fields by using an array of Hall plates.
Only a simple two-pole magnet is required to measure a rotation angle. Off-axis measurements are also possible.

The sensors are defined as SEooC (Safety Ele­ment out of Context) ASIL C ready according to ISO 26262.
Major characteristics like gain and offset, ref­erence position, etc. can be adjusted to the magnetic circuitry by programming the non-volatile memory.
The devices are designed for operation in an ambient temperature range of –40 °C up to 150 °C.
The HAL 3550 device, the single-die version, is available in a very small eight-pin SOIC8 package.
The HAR 3550 device, the dual-die version, is available in a small sixteen-pin TSSOP16 SMD package with full redundancy. Each sensor contains two independent dies that are me­chanically separated and electrically insulated.