TDK has expanded the Micronas dual-chip Hall-effect sensor product line with the HAR 379x to provide multi-dimensional magnetic field measurement for safety-critical automotive and industrial applications in accordance with ISO 26262. This new sensor provides digital output: in addition to Pulse Width Modulation (PWM), the SENT protocol is supported in accordance with the latest SAEJ2716 (rev. 4). The HAR 379x is a dual-chip SMD package version of the HAC 37xy product family that uses Micronas 3D HAL technology, measuring angles from 0° to 360° (both shaft and side), linear displacement and position. Samples are available from July 2018 and production is available in the first quarter of 2019.
The diverse programming features and high accuracy of the HAR 379x sensor make it the perfect system solution for shifting applications, providing magnetic field strength and angle signals. Both of these parameters can be quickly obtained through the SENT interface. In addition, the magnetic field strength signal can achieve the desired push functionality. The product is perfect for applications where linear displacement needs to be measured, such as measuring the pedal position in a dual clutch transmission application, as an engine stroke sensor, or as a cylinder valve position measurement.
Each HAR 379x has two independently working wafers that are mechanically and electronically separated from each other. Due to the advanced technology, the distance between the two inductors is very small. The advantage is that the two Hall elements sense the same magnetic field and the signal synchronous output is guaranteed. Placing a redundant design in a single package reduces system cost while enhancing system stability by reducing pin soldering on the PCB. The HAR 379x package is a small 8-foot SOIC8.
Traditional two-dimensional Hall technology can only sense magnetic fields perpendicular to the surface of the chip. Micronas has developed 3D HAL technology, which integrates vertical Hall slices into a standard CMOS process to induce magnetic fields from both vertical and horizontal directions for excellent angle measurement. The dual-chip HAR 379x integrates redundancy. Each sensor includes a "pixel unit" with Hall plates that sense two vertical directions (BX, BY) and one horizontal direction (BZ) with current compensation in the XYZ direction. The vertical Hall plate senses magnetic lines parallel to the sensor surface, and the Hall plate parallel to the sensor surface senses vertical magnetic lines of force. The HAR 379x achieves excellent accuracy at low cost and is stable over a wide temperature range. The sensor also has a signal processor to calculate and coordinate signals such as two magnetic field sensors, sensor protection, PWM and SAEJ2716 SENT output.
the term
3D HAL (3D Hall) technology: Ability to sense magnetic fields in X, Y, and Z directions at one point (ie, pixel unit)
main application
Automotive applications that detect angles of rotation, such as knob shifters (with push function), rear axle steering systems sense linear positions such as clutch or brake pedal, drive train, cylinder block and valve position
Main features and advantages
Angle error ±1.2° in 30 mT magnetic field strength
Direct measurement of magnetic field (BX, BY, BZ) with 360° angle measurement of shaft end and side shaft
Transmission of angle and intensity information digital output format via SENT fast channel (PWM and SENT SAE J2716 rev. 2016)
Suitable for applications with high safety requirements, ISO 26262 compliant dual-chips offer full redundancy from -40 °C to 150 °C for automotive applications
Key data
Model HAR 3795, HAR 3796, HAR 3797
Package SOIC8
Digital Output Format PWM (200 Hz ... 2 kHz), SENT SAE J2716 Rev. 2016
Angle error ±1.2° @ 30 mT
Magnetic field measurement range 20 mT ... 100 mT. Down to 5 mT, reduced accuracy safety Full redundancy scheme. SPFM ≥ 90%, LFM ≥ 60%
Sample time available July 2018
Automotive Connector Housing,Electrical Wire Automotive Connector,Automotive Electrical Connector Housing,Automotive Connectors Housing
Wenzhou Langrun Electric Co.,Ltd , https://www.langrunele.com