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Datasheet: AS5304/AS5306 Integrated Hall ICs for Linear and Off-
Axis Rotary Motion Detection
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www.ams.com AS5304 / AS5306
Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection
1 General Description 2 Key Features
High speed, up to 20m/s (AS5304), 12m/s (AS5306)
The AS5304/AS5306 are single-chip ICs with integrated Hall
elements for measuring linear or rotary motion using multi-pole
Magnetic pole pair length: 4mm (AS5304) or 2.4mm (AS5306)
magnetic strips or rings. This allows the usage of the AS5304/
Resolution: 25m (AS5304) or 15m (AS5306)
AS5306 in applications where the Sensor IC cannot be mounted at
the end of a rotating device (e.g. at hollow shafts). Instead, the
40 pulses / 160 positions per magnetic period
AS5304/AS5306 are mounted off-axis underneath a multi-pole
1 index pulse per pole pair
magnetized ring or strip and provides a quadrature incremental
output with 40 pulses per pole period at speeds of up to 20 meters/ Linear movement measurement using multi-pole magnetic
sec (AS5304) or 12 meters/sec (AS5306). strips
A single index pulse is generated once for every pole pair at the
Circular off-axis movement measurement using multi-pole
Index output. Using, for example, a 32pole-pair magnetic ring, the
magnetic rings
AS5304/AS5306 can provide a resolution of 1280 pulses/rev, which
4.5 to 5.5V operating voltage
is equivalent to 5120 positions/rev or 12.3bit. The maximum speed at
Magnetic field strength indicator, magnetic field alarm for end-
this configuration is 9375 rpm.
of-strip or missing magnet
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
3 Applications
the AS5306. The chip accepts a magnetic field strength down to 5mT
(peak). Both chips are available with push-pull outputs (AS530xA)
The AS5304 and AS5306 are ideal for high speed linear motion and
or with open drain outputs (AS530xB). The AS5304/AS5306 are
off-axis rotation measurement in applications, such as electrical
available in a small 20-pin TSSOP package and specified for an
motors, X-Y-stages, rotation knobs, and industrial drives.
operating ambient temperature of -40 to +125C.
Figure 1. AS5304 / AS5306 Block Diagram
AS5304 / AS5306
SIN SIN
A/B
A
Signal
Hall Array Quadrature
Processing ADC
& Incremental
& &
B
Frontend Interface
Channel DSP
Amplifier &
CO S COS
Amplifier
Index Index
magnetic
field alarm
Automatic
Analog
Gain
AO
Output
Control
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