Document
General Description
AS5304/AS5306
Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection
The AS5304/AS5306 are single-chip ICs with integrated Hall elements for measuring linear or rotary motion using multi-pole magnetic strips or rings. This allows the usage of the AS5304/AS5306 in applications where the Sensor IC cannot be mounted at the end of a rotating device (e.g. at hollow shafts). Instead, the AS5304/AS5306 are 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 (AS5304) or 12 meters/second (AS5306).
A single index pulse is generated once for every pole pair at the Index output. Using, for example, a 32pole-pair magnetic ring, the AS5304/AS5306 can provide a resolution of 1280 pulses/revolution, which is equivalent to 5120 positions/revolution or 12.3bit. The maximum speed at this configuration is 9375 rpm.
The pole pair length is 4mm (2mm north pole / 2mm south pole) for the AS5304, and 2.4mm (1.2mm north pole / 1.2mm south pole) for the AS5306. The chip accepts a magnetic field strength down to 5mT (peak). Both chips are available with push-pull outputs (AS5304A) or with open drain outputs (AS530xB). The AS5304/AS5306 are available in a small 20-pin TSSOP package and specified for an operating ambient temperature of -40°C to 125°C.
Ordering Information and Content Guide appear at end of datasheet.
Datasheet, Public [v3-00] 2022-Jan-24
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AS5304/AS5306− GeneralDescription
Key Benefits and Features
The benefits and features of this device are listed below:
Figure 1: Added Value of Using AS5304/AS5306
Benefits
• Contactless motion and position sensing • High speed measurement • Robust against external magnetic stray fields
Features
• Highest reliability and durability in harsh environments • Control of high speed movements • Lower material cost (no magnetic shielding needed)
• High speed, up to 20m/s (AS5304), 12m/s (AS5306)
• Magnetic pole pair length: 4mm (AS5304) or 2.4mm (AS5306)
• Resolution: 25μm (AS5304) or 15μm (AS5306)
• 40 pulses / 160 positions per magnetic period
• 1 index pulse per pole pair
• Linear movement measurement using multi-pole magnetic strips
• Circular off-axis movement measurement using multi-pole magnetic rings
• 4.5V to 5.5V operating voltage
• Magnetic field strength indicator, magnetic field alarm for end-of-strip or missing magnet
Applications
The AS5304 and AS5306 are 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.
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Datasheet, Public [v3-00] 2022-Jan-24
AS5304/AS5306 − General Description
Figure 2: Functional Blocks of the AS5304/06
Block Diagram
The functional blocks of the AS5304 and AS5306 are shown below:
S IN
Hall Array
&
Frontend
Amplifier
CO S
SIN
Signal
Processing
&
Channel
Amplif.