The AS5304 is a single-chip IC with integrated Hall elements for measuring linear or rotary motion using multi-pole magnetic strips or rings. This 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/sec. A single index pulse is generated once for every pole pair at the index output.
The magnet pole pair length is 4.0mm (2.0mm north pole / 2.0mm south pole).
The AS5304A device provides push pull configurations for the A, B and index outputs. The AS5304B device provides open drain configurations for the A, B and index outputs.
The AS5304 is available in a small 20-pin TSSOP package and specified for an operating ambient temperature of -40° to +125°C.
Ordering Guideline
| Device | Resolution | Magnet Pole Length |
Digital Outputs |
| μm | mm | ||
| AS5304A | 25 | 2 | Push Pull |
| AS5304B | 25 | 2 | Open Drain |
The AS5304 is ideal for high speed linear motion and off axis rotation measurement in applications such as
AS5304 Integrated Hall Magnetic Linear Encoder Block Diagram
