3D linear Hall effect sensor simplifies automotive rotary motion and proximity detection

Diodes Incorporated has introduced its first automotive-compliant 3D linear Hall effect sensor. The AH4930Q detects the magnetic field in the X, Y, and Z directions, permitting reliable and high-precision contactless rotary motion and proximity detection. Applications include rotary and push selectors on infotainment systems, stalk gear shifters, door handles and locks, and powered seat adjusters.

The device integrates a 12-bit temperature sensor for accurate on-chip compensation. Its robust signal path and 12-bit data converter via ADC provide high resolution for each measurement direction down to 1 Gauss (0.1mT) per bit for precise positional accuracy. The implemented I²C interface allows seamless communication for measurement data reading and runtime programming with host systems as fast as 1Mbps to support real-time adjustments.

The device provides three operating modes and a power-down mode, which consumes only 9nA. Its three operating modes supply a power consumption-data acquisition compromise, including an ultra-low-power mode consuming only 13µA (10Hz), to its fast-sampling mode of 3.8mA (3.3kHz) for constant measurement functionality. With a 10µs wake-up time, 4µs response time, and wide bandwidth, the device delivers ultra-fast data acquisition even for the most demanding applications.

The AH4930Q operates on supply voltages from 2.8V to 5.5V, and a temperature range from -40C to +125C. The 3D linear Hall effect sensor is housed in the industry-standard six-pin SOT26 (Type A1) package.