²úÆ·¸ÅÊö£º

A3282
Chopper-Stabilized Hall-Effect Latch

Features

• Chopper stabilization
  • Superior temperature stability
  • Extremely low switchpoint drift
  • Insensitive to physical stress
• Reverse battery protection
• Output short circuit protection
• Solid state reliability
• Small size
• Robust EMC capability
• High ESD ratings (HBM)

Description

The A3282 Hall-effect sensor is a temperature stable, stress-resistant latch. Superior high-temperature performance is made possible through an Allegro® patented dynamic offset cancellation that utilizes chopper-stabilization. This method reduces the offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The A3282 complements the current Allegro family of chopper-stabilized latching sensors.

The A3282 includes the following on a single silicon chip: voltage regulator, Hall voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short circuit protected open-drain output. Advanced BiCMOS wafer fabrication processing is used to take advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.

This device requires the presence of both south and north polarity magnetic fields for operation. In the presence of a south polarity field of sufficient strength, the device output latches on, and only switches off when a north polarity field of sufficient strength is present.

The A3282 is rated for operation between the ambient temperatures ¨C40¡ãC and 85¡ãC for the E temperature range, and ¨C40¡ãC to 150¡ãC for the L temperature range. The two package styles available provide magnetically optimized solutions for most applications. Package LH is an SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultramini SIP for through-hole mounting. Each package is available in a lead (Pb) free version, with 100% matte tin plated leadframes.

Functional Block Diagram