Allegro MicroSystems APS12627/APS12628 Hall-Effect Sensors
Allegro MicroSystems APS12627/APS12628 Hall-Effect Sensors are dual ultra-sensitive Hall-effect latches optimized for use with ring magnets. These devices feature vertical and planar Hall elements with sensing axes that are orthogonal to one another, providing 90° of phase separation. This phase separation is inherently independent of magnet pole spacing and air gap. No target optimization is required, making them extremely flexible and easy to use.
For example, the ring magnet pole-pitch can be changed without modifying the sensor position or other mechanical design details. Additionally, XY, XZ, and ZY options work in almost any orientation to the target. The APS12627 features Speed and Direction outputs, while the APS12628 has quadrature outputs (Channel A/B).
A unique feature allows the host system to restore the correct state after power cycling the device (-P option). This feature reduces the potential accumulation of lost counts/pulses when the device wakes up with one or more sensors in its hysteresis region.
The Allegro MicroSystems APS12627/APS12628 are on a single silicon chip and include three Hall plates (one planar and two vertical), two small-signal amplifiers, chopper stabilization, a Schmitt trigger, and two NMOS output transistors, which can sink up to 10mA continuously. The devices operate from a regulated supply voltage of 2.8V to 5.5V. Each has been qualified beyond the requirements of AEC-Q100 grade 0 for operation up to 175°C junction temperature.
The small geometries of the BiCMOS process allow these devices to be offered in an ultra-small package. Package designator “LH” indicates a modified SOT23-W surface-mount package. This package is RoHS-compliant and lead (Pb) free, with 100% matte-tin lead frame plating.
Features
- Flexible and easy-to-use sensor for motors/encoders
- ISO 26262 / ASIL B functional safety compliance
- Fault pin provides additional safety by indicating certain fault conditions
- 2D magnetic sensing via planar and vertical Hall elements
- Quadrature independent of magnet pole pitch and air gap—no target optimization required
- Works in almost any orientation to the target (XY, XZ, and ZY options)
- Two signal paths eliminate sampling delay
- An output update rate of 4.0µs, 10× faster than the previous generation—ideal for applications requiring fast response times
- Reduces the accumulation of lost counts/pulses
- The system can restore the correct state after power cycling (-P option)
- Dual outputs of quadrature or speed/direction signals
- High magnetic sensitivity
- Optimized for applications with regulated power rails
- Operation from 2.8V to 5.5V
- Automotive grade/qualified per AEC-Q100
- TJ up to 175°C
- Output short-circuit protection
- Resistant to physical stress
- Small size
Applications
- Automotive
- Power closures/actuators
- Electronic power steering
- Seat/window/sunroof motors
- Trunk/door/liftgate motors
- Industrial motors/encoders
- Garage door openers
- Motorized window blinds
- White goods
Functional Block Diagram
