Honeywell VM821Q1 Anisotropic Magnetoresistive (AMR) 4-Pin Quadrature Sensor Integrated Circuit (IC) detects the speed, direction, and position of a ring magnet encoder target using a bridge design. This IC provides quadrature, open-collector outputs, with frequency proportional to the rotational speed and direction determined by phase differences. The sensor operates reliably across various speeds and air gaps and operates within a temperature range from -40°C to +150°C, with no calibration needed. The VM821Q1 IC is resistant to mechanical vibration, supports zero-speed operation, and includes built-in protection against reverse polarity and short circuits.
Honeywell VM821Q1 AMR 4-Pin Quadrature Sensor IC
Features
- -40°C to +150°C operating temperature range
- Insensitive to mechanical vibration
- No calibration required
- Open-collector, 4-pin quadrature outputs
- Operates independently of pole size
- Reverse polarity and short-circuit protection
- Supports zero-speed detection
Applications
- Fan speed systems
- Garage door openers
- Gearbox output speed detection
- Induction motors
- Positioning roller speed and direction