Sensor IC detects speed and direction of ring magnets.
September 21, 2009 -
Suited for operation over extended temperatures to 150°C, A1222 includes on single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and short-circuit protected open-collector output that can sink up to 25 mA. On-board regulator allows for operation with supply voltages of 3-24 V. Dynamic offset cancellation reduces residual offset voltage caused by device over-molding, temperature dependencies, and thermal stress.
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Original Press release
Allegro MicroSystems Inc.
115 N.E. Cutoff, P.O. Box 15036
Worcester, MA, 01615
USA
Allegro MicroSystems, Inc. Introduces a New Addition to Their Family of Switches and Latches
Improved Switching Repeatability in Multiple Package Options
Worcester, MA - September 10, 2009 - AllegroŽ introduces a new addition to their family of Hall-effect switches and latches. The A1222 is an extremely temperature-stable and stress-resistant sensor IC suited for operation over extended temperature ranges to 150°C. Superior high temperature performance is made possible through dynamic offset cancellation, reducing the residual offset voltage normally caused by device over-molding, temperature dependencies, and thermal stress. Allegro's new A1222 device is most commonly used to detect the speed and direction of ring magnets for motor commutation.
Allegro's A1222 includes on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and short-circuit protected open-collector output that can sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3.0 to 24 V. Significant advantages are realized by reducing the minimum operating voltage. This device can be used in 3 V applications and additional external resistance can be added in series with the supply pin for greater protection against transient events.
Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while the UA is a three-lead, ultra-mini-SIP for through-hole mounting. Each package type is available as lead (Pb) free (suffix, -T), with a 100% matte tin-plated lead frame. These devices are priced from $0.41 to $0.49 dependent on package type. All devices are targeted at the automotive, industrial, and consumer markets with a 12-14 week typical lead-time to market.
About Allegro
Allegro MicroSystems, Inc. is leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor ICs. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worchester, Massachusetts (USA) with design and applications center located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
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