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VM821Q1 Datasheet(PDF) 1 Page - Honeywell Solid State Electronics Center |
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VM821Q1 Datasheet(HTML) 1 Page - Honeywell Solid State Electronics Center |
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1 / 2 page  FEATURES • Integrated quadrature sensor IC • Pole size independent operation • 4-pin quadrature, open collector outputs • -40°C to 150°C operating temperature range • Zero speed operation • No calibration required • Insensitive to mechanical vibration • Protection against reverse polarity and short circuit POTENTIAL APPLICATIONS • Industrial speed and direction and position feedback • Encoders • Conveyer rollers speed, process line speed and direction • Gearbox output speed • Positioning roller speed and direction • Garage door opening systems • Induction motors • Fan speed systems • Electric actuated blind position • Pumps and compressors • Integrated seals and bearings PORTFOLIO The Honeywell VM821Q1 AMR 4-Pin Quadrature Sensor IC joins the following related products: • VM421D1 AMR 3-Pin PWM Speed and Direction Sensor IC • VM721D1 AMR 2-Pin PWM Speed and Direction Sensor IC • VM721V1 AMR 2-Pin Speed Sensor IC Sensing and Internet of Things DESCRIPTION Honeywell’s Anisotropic Magnetoresistive (AMR) 4-Pin Quadrature Sensor Integrated Circuit (IC) is designed to detect the speed and direction and position of a ring magnet encoder target using a unique* bridge design. The frequency of the output is proportional to the rotational speed of the target, and the rotational direction is encoded by the phase between the outputs. The sensor IC works over a wide range of speeds, temperatures and air gaps. VALUE TO CUSTOMERS The VM821Q1 sensor IC has a higher sensitivity AMR bridge array that operates with a larger airgap than Hall-effect sensor ICs, which allows for enhanced design flexibility and assembly tolerances. The sensor IC has been optimized to provide an output that is not affected by target runout or sudden air gap changes. It is insensitive to magnet pole size, allowing one sensor to be paired with different ring magnet applications. DIFFERENTIATION Honeywell’s unique solution utilizes the AMR bridge in saturation, which provides a more stable output response when the system has vibration, sudden air gap changes, or target runout without requiring complex magnitude compensation algorithms. The AMR signal has greater sensitivity than Hall-effect sensor ICs, and does not require automatic gain control or chopper stabilization that can lead to increased jitter over the operating range. *Patent Pending Datasheet AMR 4-Pin Quadrature Sensor Integrated Circuit VM821Q1 32336294 Issue D |
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