Sensor Addresses Accuracy, Size, and Cost in DC Motor Applications
Melexis added the MLX92253 to its Hall-effect Dual Latch sensor family, which offers two independent signal tracks for minimal jitter. It also has a consistent 90° phase shift regardless of magnet pole pitch to enable accurate speed and direction ECU calculation with easy transfer across multiple platforms. A cost-effective choice for DC motors and encoders, it has directional feedback with linear and rotational speed as well as angular position sensing. Eliminating the need for two discrete devices or a pitch-dependent solution, the MLX92253 features two Hall plates for the Z and X axis, with two independent signal tracks.
Also included is a common magnetic center to ensure a consistent 90° phase shift between the two speed outputs, independent of the magnet pole pitch, and a low and narrow magnetic threshold to allow for smaller magnets or a larger air gap to ease assembly concerns. The MLX92253 offers fast and accurate feedback with low delay, low jitter, and increased reliability, with a chopping frequency of 500 kHz, an operating voltage range from 2.7 to 5.5 V to suit low-powered embedded designs, a wide working temperature range from -40° to 150° C, and output state feedback during startup. The startup feedback function can also convert the two outputs into inputs during startup, enabling a microcontroller to retrieve the previous state of the MLX92253 before power-down.
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Melexis
MLX92253 Hall-effect Dual Latch sensor