Technology-based position sensor with analog output and SENT interface

TDK Corporation has expanded its Micronas direct-angle Hall-effect sensor family portfolio with the new HAL 3927 sensor for automotive and industrial applications. The sensor features a linear, ratiometric analog output with integrated wire-break detection and an SAE J2716 compliant SENT interface, according to rev. 4. Samples are available. The start of production is planned for the first quarter of 2024.

The new device is a high-resolution position sensor for highly accurate position measurements. Thanks to the sensor’s versatile programming characteristics and its high accuracy, it is a potential solution for linear movement measurements in transmissions, in clutch pedals, as an engine stroke sensor, for liquid level sensing, and cylinder and valve position measurements. Furthermore, it is ideal for rotary position measurement in gear selectors, as a rotary selector with push function or rear-axis, etc. Its accurate integrated temperature sensor allows customers to replace other external temperature sensors if the application uses the SENT interface.

The sensor is based on Hall technology and can measure horizontal and vertical magnetic-field components BX, BY and BZ. Based on the signals of two of three magnetic-field components, the device can measure 360° angular range and linear movements. On-chip signal processing calculates one angle from two orthogonal magnetic-field components and converts this value into an output signal. As well as the built-in signal processing, the sensor provides an arbitrary programmable output characteristic, e.g. for linearisation of the output signal via up to 33 setpoints (17 variable- or 33 fixed). Major characteristics such as gain and offset, reference position can be adjusted to the magnetic circuitry by programming the non-volatile memory. This product is defined as ASIL B ready SEooC according to ISO 26262. The sensor is available in the eight-pin SOIC8 SMD package.

Main applications for the sensor include detection of angle of rotation in automotive applications, rotary shifters (with push-function), liquid-level measurement, as well as rear-axis steering systems; detection of linear position in applications like clutch or brake pedal stroke, transmission system, cylinder and valve position sensing.