The integrated solid-state Hall-effect switch supports silent, sealed, contactless activation and offers a significant upgrade from failure-prone mechanical switches and provides very low standby current (25μA). The LED driver features low-noise, adjustable, linear drive of up to 150mA into one or more LEDs. An optional external capacitor programmes the turn-on/turn-off rate, adding an elegant ‘theatre’ effect. It is controlled by the Hall-effect switch and turns on and off in response to a magnet. The Hall-effect switch is omnipolar (responsive to both North and South magnetic poles) and highly sensitive (BOP = 40G) to support a wide range of mechanical configurations and enclosures with various air-gaps and degrees of mechanical misalignment. The AP13568 features selectable output polarity as well as an open drain output for connecting to additional external circuitry.
This new device complements Allegro Microsystem’s existing portfolios of LED drivers and Hall-effect switches by adding an external output and micropower operation (25μA). It is targeted at consumer electronics, white goods, boats, RVs, motorcycles, and interior and auxiliary automotive lighting applications such as glove boxes, centre consoles, vanity mirrors, trunks/boots and truck beds. The on-board micropower regulator permits operation with supply voltages of 7-24V while providing low average supply current when the output is disabled. Reliability and EMC performance are enhanced with Zener clamps, output short-circuit protection, thermal shutdown, and reverse-battery protection. Superior Hall switch performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature drift, and thermal stress.
The device is available in two versions: the ‘K’ option is an automotive-grade (AEC-Q100) device that operates from -40 to 125°C; the ‘E’ option is for industrial and consumer applications that operate from -40 to 85°C. Both versions feature a RoHS-compliant, thermally enhanced SOIC-8 surface-mount package (designator ‘LJ’). ASEK13568KLJA prototype boards are also available.