Product features
● TDK expands its line of innovative anti-stray magnetic field sensors with optimized sensors for high speed, low delay motor positions
● It still has first-class angular accuracy performance under extremely harsh mechanical and electrical conditions
● Fully comply with ISO 26262 ASIL C Functional Safety Guidelines
TDK has introduced the Micronas Fast 2D Hall Effect position sensor family HAL 302X to meet the demand for position detection against stray field motors in automotive and industrial applications and for development in compliance with ISO/26262 standards. This new sensor family initially contains two members, HAL 3020 and HAL 3021, with differential and unipolar chord and cosine analog outputs for standard Angle calculations with external microcontrollers/ECUs.
HAL 3020 is suitable for high cost performance applications such as electric pumps or electric valves. For these types of application scenarios, the sensor can be easily integrated with TDK's Micronas embedded motor controller product family for more precise and secure motor control. HAL 3021 is suitable for demanding high speed sensing applications such as electric power steering, electric motors (E-axis), electric brake booster and electromechanical brake (EMB).
The HAL 302x sensor can measure the full rotation Angle of 360° by evaluating the vertical magnetic field component (BZ). The HAL 3020 uses three horizontal Hall plate arrays, while the HAL 3021 uses six. Both sensors suppress external DC and AC stray fields (ISO 11452-8). A simple and cost-effective coaxial (axle-end) configuration of a bipolar ferrite magnet is sufficient to measure the absolute angular position by calculating the suppression of harmonic interference in the stimulus signal within the device. The inherent stray-field robustness eliminates the need for expensive magnetic shielding and the use of stronger target magnets. This provides greater flexibility in the design and production of next-generation motors for hybrid and electric vehicles.
A key advantage of HAL 3021 is that the device provides best-in-class robustness against static and dynamic mechanical misalignments such as off-axis displacement, air gap variation, and tilt. This ensures a high degree of reliability and efficient field-oriented control over the lifetime of the motor. To reduce the load on the ECU, the sensor can compensate for major sensor and system-level nonideal factors such as sine and cosine amplitude Angle mismatches, offset errors, (absolute) 0 Angle errors, and orthogonal errors on chip.
HAL 302X has been defined as an Independent Safety Element (SEooC) ASIL C class according to ISO 26262, supporting system-level integration up to ASIL D class. The sensor integrates various security monitoring functions to help improve diagnostic coverage and simplify external security oversight on the ECU side. The sensor operates at junction temperatures ranging from -40℃ to +170℃ and is packaged in a small eight-pin SOIC8 SMD package.
Main application scenarios
● Brushless direct current (BLDC) and permanent magnet synchronous motor (PMSM) commutation in safety-related environments
● Electric brake booster
● Electromechanical Brake (EMB)
● Clutch and transmission actuator
● Starter/generator system
● Electric pump
● Electric valve
Functions and advantages
● High-speed 360° non-contact Angle measurement
● Robustness against DC and AC stray fields (according to ISO 11452-8:215)
● Support functional safety application scenarios in accordance with ISO 26262:2018 SEooC ASIL Class C (The device can be integrated into automotive safety-related systems up to ASIL Class D)
● EMC Robust differential and single-ended SIN/COS analog output signals
● On-chip calibration and integrated safety monitoring reduce the workload at the ECU level
● Customer programmable wide magnetic field range between 5 and 250 mT, can be adjusted according to different mechanical requirements and magnetic fields
● Operating voltage is 3.0V to 5.5V
● Fast response time and high output bandwidth for applications up to 150,000 rpm
● Temperature range of working node is between -40℃ and +170℃
● Programming through the output pin of the sensor. It can be programmed at the module level without additional programming pins
● Overvoltage and reverse voltage protection
