1. Overview & Purpose

️· What they are: AS5304 and AS5306 are high-performance, non-contact magnetic position sensors. They's designed for rotary and linear position sensing applications.
️· How they work: They detect the position of a magnetic pole using Hall sensors and advanced signal processing.
️· Key applications: Rotary encoders (motor control, robotics, automation), linear position feedback (motion control, industrial automation).

2. Key Features & Benefits

️· High Resolution: Up to 3520 steps per revolution, achieved through interpolation.
️· Non-Contact: No mechanical wear and tear, long operational life.
️· High-Speed: Capable of processing magnetic field changes at up to 5 kHz (equivalent to 300,000 RPM for rotary applications).
️· AGC (Automatic Gain Control): Provides information about the distance between the sensor and the magnet via the AO output.
️· Quadrature Output: Provides direction information.
️· Small Package Size: 20-pin TSSOP.
️· Analog Output (AO): Monitoring magnet-to-sensor distance.

3. Operating Principles & Signal Output

️· Magnetic Field Detection: The sensor detects alternating north and south magnetic poles.
️· Interpolation: The sensor interpolates the magnetic field signal to increase resolution. The number of interpolated steps is 160. (40 quadrature pulses).
️· Outputs:
- Quadrature Output (A & B): Provides position information and direction.
- Analog Output (AO): Reflects the AGC signal, indicating magnet-to-sensor distance. A shorter distance results in a lower AO voltage, and a longer distance results in a higher AO voltage.

4. Application Considerations & Performance Parameters

️· Magnetic Ring/Strip Design:
- Rotary Applications (Ring Magnet): Pole length must be constant (4mm for AS5304, 2.4mm for AS5306). The diameter of the ring increases linearly with the number of pole pairs.
- Linear Applications (Strip Magnet): Also, the pole length is fixed (2.0mm for AS5304, 2.4mm for AS5306).
️· Resolution Calculations:
- `Resolution (steps) = Interpolation Factor (160) * Number of Pole Pairs`
- `Resolution (bits) = log(Resolution(steps)) / log(2)`
️· Maximum Speed Calculations:
- `Maximum Rotation Speed (RPM) = 300000 / Number of Pole Pairs`
- `Maximum Linear Travelling Speed (mm/s) = 5000 * Pole Pair Length`
️· Important Limits:
- DNL (Dynamic Non-Linearity): Must be less than ±½ LSB to avoid missing codes.
- Pole Length Consistency: Crucial for accurate position sensing.
- Sensor Placement: Ensure sensors are aligned with the magnet's median to ensure accuracy.

5. Key Equations & Values Summary

Parameter	AS5304	AS5306
Interpolation Factor	160	160
Fixed Pole Length (Ring)	4 mm	2.4 mm
Fixed Pole Length (Strip)	2 mm	2.4 mm
Max. Rotation Speed (Rel. to # of Poles)	300000 rpm	300000 rpm

6. Package Information

️· Package Type: 20-Pin TSSOP
️· Marking: MZZ followed by the device number (04 or 06) and the lot code.