Honeywell – AMR 4-Pin Quadrature Sensor Integrated Circuit VM821Q1
Honeywell – AMR 4-Pin Quadrature Sensor Integrated Circuit VM821Q1
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.
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.
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.
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
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
The VM821Q1 sensor which provides a quadrature output is intended for industrial applications. It is part of a new platform that also includes the VM421D1 speed & direction, the VM721D1 speed & direction, and the VM721V1 speed sensors for industrial, transportation, and automotive grade applications.
