AS5304/AS5306
Integrated Hall ICs for Linear and
Off-Axis Rotary Motion Detection
The AS5304/AS5306 are single-chip ICs with integrated Hall
General Description
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 (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 -40C to 125C.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet Page 1
[v2-00] 2017-May-03 Document FeedbackAS5304/ AS 5306 Ge ne r a l De s c ri p t i o n
Key Benefits and Features
The benefits and features of this device are listed below:
Figure 1:
Added Value of Using AS5304/AS5306
Benefits Features
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 (AS5304), 12m/s (AS5306)
Magnetic pole pair length: 4mm (AS5304) or 2.4mm
(AS5306)
Resolution: 25m (AS5304) or 15m (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.
Page 2 ams Datasheet
Document Feedback [v2-00] 2017-May-03