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1 General Description

The AS5304/AS5306 are single-chip IC’s 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/sec (AS5304) or 12 meters/sec

(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/rev, which is equivalent to 5120 positions/rev 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

(AS530xA) 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° to +125°C.

Figure 1:

AS5304 (AS5306) with multi-pole ring magnet.

2 Benefits

• Complete system-on-chip

• High reliability due to non-contact sensing

• Suitable for the use in harsh environments

• Robust against external magnetic stray fields

3 Key Features

• 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

• 4.5 to 5.5V operating voltage

• Magnetic field strength indicator, magnetic field alarm

for end-of-strip or missing magnet

4 Applications

The AS5304/AS5306 are ideal for high speed linear motion

and off-axis rotation measurement in applications such as

• electrical motors

• X-Y-stages

• rotation knobs

• industrial drives

Figure 2:

AS5306 (AS5304) with magnetic multi-pole strip magnet

for linear motion measurement

AS5304 / AS5306

Integrated Hall ICs for

Linear and Off-Axis Rotary Motion Detection

PRELIMINARY DATA SHEET