New Industry Products

Linear Hall-Effect Sensor for Harsh Environments Meets SAE J2716

March 27, 2019 by Scott McMahan

TDK Corporation expanded its Micronas linear Hall-effect sensor portfolio with the programmable HAL 1890 supporting the latest Single Edge Nibble Transmission (SENT) protocol according to SAE J2716 Rev. 4. The HAL 1890 now comes with digital output signal supervision and it is as small, robust, and cost-effective as the already existing HAL 188x variants.

The HAL 1890 is a 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.

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-/over-voltage, under/overflow of the signal path, and over-current.

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

The simple programmability allows a 2-point calibration by adjusting the output signal directly to the input signal (such as current, mechanical angle, or distance). Individual adjustment of each sensor during customer manufacturing is possible. With this calibration procedure, the tolerance of the sensor, the mechanical positioning, and the magnet can be compensated in the final assembly.

The HAL 1890 is AEC-Q100 qualified and is housed in a standard 3-pin TO92-UA package. The device is 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 a spread-pin version with 2.54mm pin-to-pin spacing, which is better suited for welding.

"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," says Matthieu Rezé, Product Marketing Manager Magnetic Sensors at TDK-Micronas.

Main Features and Benefits

  • SENT output according to SAE J2716 Rev. 4
  • Support of 3 and 6 data nibbles with secure information frame format (H.2 and H.4)
  • Enhanced 8-bit ID serial message format
  • Selectable clamping levels with selectable diagnosis
  • Comprehensive diagnostic feature set
  • Programming via output pin or supply voltage modulation
  • Operates with static and dynamic magnetic fields of up to 5kHz

Samples are now available. Volume production is scheduled for the second half of 2019.