A1386

• Low power consumption using 3 V supply
• Factory programmed sensitivity temperature coefficient (0.13%/°C nominal)
• Programmability at end-of-line
• Ratiometric sensitivity, quiescent voltage output, and clamps for interfacing with application DAC
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic capabilities
• Wide ambient temperature range: ?0°C to 150°C
• Resistant to mechanical stress
• Miniature package options

Description

The Allegro® A1386 programmable, linear, Hall effect sensor is designed for low power, high accuracy, and small package size applications. The accuracy of A1386 is enhanced via programmability on the output pin for end-of-line optimization without the added complexity and cost of a fully programmable device.

The A1386 has two operating modes, normal and low power. In normal operation mode the A1386 operates much like its predecessors, the A1381, A1382, A1383, and A1384, as a highly accurate, user-programmable linear sensor with a ratiometric output. In low power mode, the device actually disengages some internal components in order to reduce power consumption. Although the accuracy of the A1386 is substantially reduced during low power operation, it remains effective as a detector of magnetic regions (such as north and south poles on a rotating ring magnet). This unique feature allows the A1386 to be used in systems that are put to sleep, during which time there may be only 3 V available, or in applications that have start-up conditions where the available supply voltage may drop below 4.5 V for a period of time.

This ratiometric Hall effect sensor of A1386 provides a voltage output that is proportional to the applied magnetic field over the entire 2.7 to 5.5 V supply operating region. Both the quiescent voltage output and magnetic sensitivity are user adjustable. The quiescent voltage output can be set to approximately 50% of the supply voltage, and the sensitivity adjusted between 1.90 and 3.50 mV/G for VCC = 5 V. The sensitivity temperature coefficient is programmed at the factory, at 0.13%/C nominal, to compensate for Neodymium-style magnets. The features of A1386 make it ideal for the high accuracy requirements of automotive and industrial applications. Performance is guaranteed over an extended temperature range, 0°C to 150°C.

A1386 contains a BiCMOS monolithic circuit that integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage, and a proprietary dynamic offset cancellation technique.

The A1386 sensor is provided in a 3-pin ultramini single-in-line package (UA suffix), and a 3-pin surface mount SOT-23W package (LH suffix). Both packages are lead (Pb) free, with 100% matte tin leadframe plating.