AS5304B

AS5304B is a single-chip IC with integrated hall elements for measuring linear or rotary motion using multi-pole magnetic strips or rings. It allows the usage of the AS5304 in applications where the sensor IC cannot be mounted at the end of a rotating device (e.g. at hollow shafts). Instead, the AS5304 is mounted off-axis underneath a multi-pole magnetized ring or strip and provides a quadrature incremental output with 40 pulses per pole period at speeds of up to 20 meters/second. A single index pulse is generated once for every pole pair at the index output. It features circular off-axis movement measurement using multi-pole magnetic rings, magnetic field strength indicator, magnetic field alarm for end-of-strip or missing magnet. It is ideal for high-speed linear motion and off-axis rotation measurement in applications, such as electrical motors, X-Y-stages, rotation knobs, and industrial drives.

• Open drain
• Contactless motion and position sensing, highest reliability and durability in harsh environments
• High speed measurement, control of high speed movements
• Robust against external magnetic stray fields, lower material cost (no magnetic shielding needed)
• High speed up to 20m/s, magnetic pole pair length is 4mm, resolution is 25µm
• 40 pulses / 160 positions per magnetic period, 1 index pulse per pole pair
• Linear movement measurement using multi-pole magnetic strips
• Operating voltage range from 4.5V to 5.5V, power supply current range from 25 to 35mA
• 1.5LSB typical hysteresis
• 20-pin TSSOP package, ambient temperature range from -40 to 125°C