Allegro 2D latch ICs have vertical and planar Hall elements

Allegro Microsystems APS12625 and APS12626 sensor ICs

Allegro Microsystems has released a family of two-dimensional (2D) Hall-Effect latch ICs that have vertical and planar Hall elements.

The APS12625 and APS12626 sensor ICs help reduce system size and cost along with increasing performance and flexibility due to 2D sensing. They were developed in accordance with ISO 26262 and qualified per AEC-Q100.

The APS12625 has speed and direction outputs whereas the APS12626 has quadrature (channels A and B) outputs. An optional feature allows the host system to restore the previous state of the sensor after a power-cycle. This reduces the potential accumulation of lost counts in intelligent motion applications such as window lifts with anti-pinch requirements. 

Each IC contains a pair of sensor ICs that are orthogonal to one another and provide 90˚ phase separation between channels that is independent of magnet pole spacing and air gap.

They are both available in each of three combinations of vertical and planar Hall elements (XY, ZX and ZY). Virtually any orientation between the sensor IC and the ring magnet can be accommodated, and the ring magnet pitch can be changed without losing quadrature.

“Allegro’s vertical Hall technology enables sensor ICs that are uniquely suited to magnetic motor-encoder applications,” said Jim Judkins, product line director at Allegro Microsystems. “Designers can achieve lower BoM cost and power in less board area while meeting their safety goals and spending less time iterating designs to support changes in magnet pitch or system form factor.”

These monolithic devices each include three Hall plates (one planar, two vertical), a multiplexer, a small-signal amplifier, chopper stabilisation, Schmitt trigger and two nmos output transistors. They operate from 2.8 to 5.5V and up to +175˚C junction temperature.

Each sot23-5 device replaces a pair of conventional Hall-effect latch ICs, meaning that redundant sensing for safety applications can be accomplished in virtually the same space as non-redundant implementations using legacy technology.

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