New entry-level linear Hall-effect sensor with SENT output

26th March 2019

Lanna Deamer

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TDK Corporation has expanded its Micronas linear Hall-effect sensor portfolio with the programmable HAL 1890 supporting the latest SENT protocol according to SAE J2716 Rev. 4. The HAL 1890 now comes with digital output signal supervision and is as small, robust, and cost effective as the already existing HAL 188x variants. The HAL 1890 is an optimal system solution to measure small angles of up to 90° or linear displacements of a few millimeters in harsh environments.

For example, it may be used as a gear position detection sensor in dual-clutch automatic transmission or as a steering torque sensor for industrial or recreational vehicles. Samples are available as of now. Start of production is planned for the second half of 2019.

The sensor supports various SENT data frame formats (H.2 and H.4) as well as error signal transmission on Fast and Slow channels. Several programmable output signal clamping levels extend the error signaling capabilities to indicate various fault conditions, such as under/overvoltage, under/overflow of the signal path, and overcurrent.

The signal path of the HAL 1890 enables flexibility via external programming: major characteristics, like magnetic-field range, sensitivity, offset, and temperature coefficients, are programmable in non-volatile memory. A one-pin programming interface enables simultaneous programming of several sensors via their output pins. The HAL 1890 generates an accurate and customised output from a magnetic input signal and provides 10-bit output resolution supporting a maximum bandwidth of 5kHz.

“The HAL 1890 retains the advantages of its predecessors in stringent application environments thanks to its protection functions and diagnostic capabilities. Additionally, it profits from the latest SENT protocol by transmitting not only sensor data and error codes but also other parameters, including sensor ID, magnetic range, sensitivity, and offset. Customers looking to secure and enhance their data transmission can benefit significantly from the feature set of the HAL 1890 at this price level,” said Matthieu Rezé, Product Marketing Manager Magnetic Sensors at TDK-Micronas.

The HAL 1890 is qualified according to AEC-Q100 and is housed in an industry standard 3-pin TO92-UA package, lead free, with matte tin lead frame plating. It comes with two pin configurations: an in-line version with 1.27mm pin-to-pin spacing or, alternatively, a spread-pin version with 2.54mm pin-to-pin spacing, which is better suited for welding.