Datasheet: AS5304/AS5306 Integrated Hall ICs for Linear and Off-
Axis Rotary Motion Detection
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AS5304 / AS5306
I n t e g r a t e d H a l l I C s f o r L i n e a r an d O f f - A x i s R o t a r y M o t i o n D e t e c t i o n
1 General Description
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/
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 Block Diagram
2 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
3 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.
AS5304 / AS5306
S IN
SIN
Hall Array
&
Frontend
Amplifier
CO S
Signal
Processing
&
Channel
Amplifier
C OS
ADC
&
DSP
A/ B
Quadrature
Incremental
Interface
&
Index
A
B
Index
Automatic
Gain
Control
magnetic
field alarm
Analog
Output
AO
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Revision 1.9
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AS5304 / AS5306
Datasheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
6.2 System Parameters ..............................................................................................................................................................................
6.3 A / B / C Push/Pull or Open Drain Output.............................................................................................................................................
6.4 CAO Analog Output Buffer ...................................................................................................................................................................
6.5 Magnetic Input ......................................................................................................................................................................................
7.2 Incremental Quadrature AB Output ......................................................................................................................................................
7.2.1
7.2.2
7.2.3
7.2.4
7
7
8
Index Pulse .................................................................................................................................................................................. 8
Magnetic Field Warning Indicator ................................................................................................................................................ 8
Vertical Distance between Magnet and IC................................................................................................................................... 9
Soft Stop Feature for Linear Movement Measurement.............................................................................................................. 10
7.4 Integral Non-Linearity (INL) ................................................................................................................................................................
7.4.1 Error Caused by Pole Length Variations ................................................................................................................................... 11
8 Application Information ...........................................................................................................................................................
8.1 The AO Output ...................................................................................................................................................................................
8.2 Resolution and Maximum Rotating Speed .........................................................................................................................................
Multi-pole Ring Diameter ...........................................................................................................................................................
Maximum Rotation Speed .........................................................................................................................................................
Maximum Linear Travelling Speed ............................................................................................................................................
13
14
14
14
14
15
15
9 Package Drawings and Markings ...........................................................................................................................................
9.1 Sensor Placement in Package ...........................................................................................................................................................
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