Magnetic Sensor ICs Maximize Battery Life

(Allegro MicroSystems)

Allegro MicroSystems’ APS11700 and APS11760 micropower Hall-effect switch ICs are designed specifically for battery powered applications in harsh industrial and automotive environments. Automatic power management enables an average supply current as low as 6 µA while operating directly from a vehicle battery or other unregulated supply. The power management happens in the background and is transparent to the host system, making them a drop-in upgrade for existing Hall-effect switches or a solid-state replacement for mechanical microswitches or reed switches. 


The monolithic devices include either a standard Hall plate or a vertical Hall plate, a small-signal amplifier, chopper stabilization, a Schmitt trigger, automatic power management controller, and an NMOS output transistor. The APS11700 uses a standard planar Hall-effect sensing element, while the APS11760 implements AVHT technology in the form of a silicon-based vertical Hall-effect sensing element. The APS11760 devices are therefore sensitive to magnetic flux parallel to the face of the IC package, mimicking the in-plane sensitivity of common reed switches. 


The APS11700/760 devices come preconfigured with a choice of magnetic sensitivity, thresholds, polarity, and active-high or active-low output. They are qualified to AEC-Q100 Grade 0 and compliant with ISO 26262:2011 ASIL A when properly applied, making them suitable for automotive and other safety systems. They can tolerate up to 40V and junction temperature up to 165°C.  In addition, they are internally protected against overvoltage, reverse-battery, load-dump, output short-circuits, human-body-model ESD up to ±11kV, and other EMC conditions.


Two package styles are available. Allegro’s LH package is a SOT-23W style, miniature, low-profile package for surface-mount applications; the UA is a 3-pin, ultra-mini, single inline package (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matt-tin leadframe plating. 


For greater insights and illumination, download the APS11700 and APS11760 datasheet.