Programmable Hall-Effect Sensor Family for Rotational or Linear Position Detection based on 3D HAL® Technology
Short Description
The HAL 37xy family is the second sensor generation using Micronas’ proprietary 3D HAL® technology, which offers a further improvement of the angular performance. Compared to the first generation, a 30% lower angular error has been achieved.
HAC 37xy features integrated capacitors for improved electromagnetic compatibility (EMC) and PCB-less applications. It is available in the TO92UF package.
HAR 37xy is the dual-die version of the HAL 37xy family. It is available in the same SOIC8 package as of HAL 37xy. Each sensor provides true redundancy as it consists of two independent dies stacked in a single package. The stacked-die architecture ensures that both dies sense the same magnetic field position, thus generating synchronous measurement outputs.
Operation with magnetic fields down to ±20 mT is enabled thanks to the improved technology. HAL 3715 and HAL 372x provide a linear, ratiometric analog output signal with integrated wire-break detection working with pull-up or pull-down resistors. HAL 373x features digital output formats such as PWM and SENT SAEJ2716 rev. 2010. The digital output format is customer programmable.
The sensors can measure three magnetic field components B X, BY, and BZ. This enables a set of potential applications for position detection, such as wide distance, angle or through-shaft angular measurements. On-chip signal processing calculates the angle out of two of the magnetic field components and converts this value into an output signal. The sensor exhibits excellent drift performance over the specified temperature range resulting in a new class of accuracy for angular or linear measurements. The sensor features an arbitrarily programmable stepwise linear characteristic for linearization of the output signal. Major characteristics can be adjusted to the magnetic circuit by programming the non-volatile memory.
The sensors contain advanced on-board diagnostic features that enhance fail-safe detection. The devices are designed for automotive and industrial applications and operate in the junction temperature range from −40 °C up to 170 °C. The sensors are available in a very small four-pin leaded transistor package TO92UP, as well as in a SOIC8 package.
Block diagram – system architecture
The sensors include two vertical and one horizontal Hall plate with spinning current offset compensation for the detection of X, Y, or Z magnetic field components, a signal processor for calculation and signal conditioning of two magnetic field components, protection devices, and a ratiometric linear analog, PWM, or SENT output.
The spinning current offset compensation minimizes the errors due to supply voltage and temperature variations or external package stress.
The signal path of HAL 37xy consists of two channels (CH1 and CH2). Depending on the product variant, two out of the three magnetic field components are connected to Channel 1 and Channel 2.
The sensors can be used for angle measurements in a range between 0° and 360° (end-of-shaft and through-shaft setup), as well as for robust position detection (linear movement or position). The in-system calibration can be utilized by the system designer to optimize the performance for a specific system. The calibration information is stored in the on-chip EEPROM.
The HAL 37xy is programmable by modulating the output voltage. No additional programming pin is needed.
License Note:
HAL 37xy uses licenses of Fraunhofer Institute for Integrated Circuits IIS.