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PDF AS5304 Data sheet ( Hoja de datos )
| Número de pieza | AS5304 | |
| Descripción | Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection | |
| Fabricantes | austriamicrosystems AG | |
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AS5304 / AS5306
Integrated Hall ICs for
Linear and Off-Axis Rotary Motion Detection
www.DataSheet4U.com
PRELIMINARY DATA SHEET
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.
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 1:
Revision 1.5
AS5304 (AS5306) with multi-pole ring magnet.
Figure 2:
www.austriamicrosystems.com
AS5306 (AS5304) with magnetic multi-pole strip magnet
for linear motion measurement
Page 1 of 13
1 page  
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
www.DataSheet4U.com
7 Incremental Quadrature AB Output
The digital output is compatible to optical incremental
encoder outputs. Direction of rotation is encoded into
two signals A and B that are phase-shifted by 90º.
Depending on the direction of rotation, A leads B
(CW) or B leads A (CCW).
7.1.1 Index Pulse
A single index pulse is generated once for every pole
pair. One pole pair is interpolated to 40 quadrature
pulses (160 steps), so one index pulse is generated
after every 40 quadrature pulses (see Figure 6)
The Index output is switched to Index = high, when a
magnet is placed over the Hall array as shown in
Figure 7, top graph: the north pole of the magnet is
placed over the left side of the IC (top view, pin#1 at
bottom left) and the south pole is placed over the
right side of the IC.
The index output will switch back to Index = low,
when the magnet is moved by one LSB from position
X=0 to X=X1, as shown in Figure 7, bottom graph.
One LSB is 25µm for AS5304 and 15µm for AS5306.
Note: Since the small step size of 1 LSB is hardly
recognizable in a correctly scaled graph it is shown as an
exaggerated step in the bottom graph of Figure 7.
A
B
Index
Detail:
A
B
Index
Step #
SN S NS
40 1
2
40 1
2
40 1
2
40 1
2
157 158 159 0 1 2 3 4 5
Figure 6: Quadrature A / B and Index output
7.1.2 Magnetic Field Warning Indicator
The AS5304 can also provide a low magnetic field warning to indicate a missing magnet or when the end of the magnetic strip
has been reached. This condition is indicated by using a combination of A, B and Index, that does not occur in normal
operation:
A low magnetic field is indicated with:
Index = high
A=B=low
7.1.3 Vertical Distance between Magnet and IC
The recommended vertical distance between magnet and IC depends on the strength of the magnet and the length of the
magnetic pole.
Typically, the vertical distance between magnet and chip surface should not exceed ½ of the pole length.
That means for AS5304, having a pole length of 2.0mm, the maximum vertical gap should be 1.0mm,
For the AS5306, having a pole length of 1.2mm, the maximum vertical gap should be 0.6mm
These figures refer to the chip surface. Given a typical distance of 0.2mm between chip surface and IC package surface,
the recommended vertical distances between magnet and IC surface are therefore:
AS 5304: ≤ 0.8mm
AS 5306: ≤ 0.4mm
Revision 1.5
www.austriamicrosystems.com
Page 5 of 13
5 Page 
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
www.DataSheet4U.com
9.4 A / B / C Push/Pull or Open Drain Output
Push Pull Mode is set for AS530xA, Open Drain Mode is set for AS530xB versions.
Parameter
High level output voltage
Low level output voltage
Current source capability
Current sink capability
Symbol
VOH
VOL
ILOH
ILOL
Min
0.8 VDD
12
13
Typ Max
0.4 + VSS
14
15
Short circuit limitation current
IShort
25 39
Capacitive load
Load resistance
Rise time
Fall time
CL 20
RL 820
tR 1.2
tF 1.2
Unit Note
V Push/Pull mode
V
mA Push/Pull mode
mA
mA
Reduces maximum
operating temperature
pF See Figure 13
Ω See Figure 13
µs Push/Pull mode
µs
VDD = 5V
RL = 820Ω
A/B/Index
from
AS5304/6
TTL
74LS00
CL = 20pF
Figure 13: Typical digital load
9.5 CAO Analogue Output Buffer
Parameter
Symbol
Min
Typ
Minimum output voltage
VOutRange
0.5
1
Max
1.2
Maximum output voltage
VOutRange
3.45
4
4.3
Offset
Current sink / source capability
VOffs
IL
5
±10
Average short circuit current
IShort
6
40
Capacitive load
Bandwidth
CL 10
BW 5
Unit Note
V
Strong field, min.
AGC
V
Weak field, max.
AGC
mV
mA
Reduces maximum
mA Operating
Temperature
pF
KHz
Revision 1.5
www.austriamicrosystems.com
Page 11 of 13
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AS5304.PDF ] | |
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