Hall-Effect 3D Position Sensor Provides Ratiometric Analog and Switch Outputs
TDK added the HAR 3920-2100 dual-die sensor to its Micronas 3D HAL position sensor family, able to provide accurate linear and angular position measurements, even in disruptive stray magnetic fields. Targeting automotive and industrial applications, it meets ISO 26262 and is compliant with ASIL C requirements for applications like accelerator pedal position, throttle valve position measurement, or other non-contact sensing. It features a dual-redundancy design with two independent dies stacked in a single package to ensure consistent output signal characteristics by occupying the same magnetic-field position.
The Hall-based sensor measures vertical and horizontal magnetic-field components, suppressing external magnetic stray-fields using an array of Hall plates, and can measure 360° angular range and linear movements. A simple two-pole magnet is sufficient for precise rotation angle measurements, best placed above the sensitive area in an end-of-shaft configuration. The operating temperature range is from –40 up to 160°C.
The HAR 3920-2100 delivers a linear, ratiometric analog output signal with passive wire-break detection, and is compatible with pull-up or pull-down resistors. It also has a switch output (open drain) derived from calculated position information, or other sources along the device's signal path. Users can define on/off switching points, switch logic, and switch polarity, while on-chip signal processing calculates one angle per die from the magnetic-field components. Users can also adjust major characteristics like gain, offset, and reference position.
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TDK
Micronas 3D HAL position sensor family