AS5306_Datasheet_v1

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is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
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AS5304 / AS5306
Integrated Hall ICs for
Linear and Off-Axis Rotary Motion Detection
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.
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)
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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 multipole 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).
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General Description
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1
DATA SHEET

Magnetic pole pair length: 4mm (AS5304) or
2.4mm (AS5306)

Resolution: 25µm (AS5304) or 15µm (AS5306)
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.

40 pulses / 160 positions per magnetic period.

1 index pulse per pole pair

Linear movement
magnetic strips
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).

Circular off-axis movement measurement using multipole magnetic rings

4.5 to 5.5V operating voltage

Magnetic field strength indicator, magnetic field alarm
for end-of-strip or missing magnet
A single index pulse is generated once for every pole pair
at the Index output.
Both chips are available with push-pull outputs
(AS530xA) or with open drain outputs (AS530xB).
4
using
multi -pole
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
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The AS5304/AS5306 are available in a small 20-pin
TSSOP package and specified for an operating ambient
temperature of -40° to +125°C.
measurement
Figure 1:
Revision 1.9
AS5304 (AS5306) with multi-pole ring magnet.
Figure 2:
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AS5306 (AS5304) with magnetic multi-pole strip magnet
for linear motion measurement
Page 1 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
5
Functional Description
The AS5304/AS5306 require a multi-pole magnetic strip or ring with a pole length of 2mm (4mm pole pair length) on the
AS5304, and a pole length of 1.2mm (2.4mm pole pair length) on the AS5306. The magnetic field strength of the multi-pole
magnet should be in the range of 5 to 60mT at the chip surface.
The Hall elements on the AS5304/AS5306 are arranged in a linear array.
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By moving the multi-pole magnet over the Hall array, a sinusoidal signal (SIN) is generated internally. With proper configuration
of the Hall elements, a second 90° phase shifted sinusoidal signal (COS) is obtained. Using an interpolation circuit, the len gth
of a pole pair is divided into 160 positions and further decoded into 40 quadrature pulses.
An Automatic Gain Control provides a large dynamic input range of the magnetic field.
SIN
SIN
Signal
Processing
&
Channel
Amplifier
COS
COS
A
Figure 3:
B
Index
magnetic
field alarm
Automatic
Gain
Control
6
ADC
&
DSP
A/B
Quadrature
Incremental
Interface
&
Index
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Hall Array
&
Frontend
Amplifier
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An Analog output pin (AO) provides an analog voltage that changes with the strength of the magnetic field (see chapter 8).
Analog
Output
AO
AS5304 / AS5306 block diagram
Sensor Placement in Package
1.02
Die C/L
0.2299±0.100
0.2341±0.100
3.200±0.235
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TSSOP20 / 0.65mm pin pitch
Package
Outline
0.7701±0.150
3.0475±0.235
Figure 4:
Sensor in package
Die Tilt Tolerance ±1º
Revision 1.9
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Page 2 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Pin Description
Pin
Pin Name
Pin Type
1
VSS
S
2
A
DO_OD
3
VDDP
S
4
B
DO_OD
5,12,13,
14,17,18,19
TEST
AIO
test pins, must be left open
6
AO
AO
AGC Analogue Output. (Used to detect low magnetic field strength)
7
VDD
S
8
Index
DO_OD
9,10,11
TEST
AIO
15
TEST_GND
S
test pin, must be connected to VSS
16
VDDA Hall
S
Hall Bias Supply Support (connected to VDD)
20
ZPZmskdis
Supply ground
Incremental quadrature position output A . Short circuit current limitation
Peripheral supply pin, connect to VDD
Positive supply pin
test pins, must be left open
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Index output, active HIGH. Short Circuit Current Limitation
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Incremental quadrature position output B. Short Circuit Current Limitation
S
AIO
DO_OD
DI
Test input, connect to VSS during operation
supply pin
AO
analogue output
analog input / output
DI
digital input
digital output push pull or open drain (programmable)
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PIN Types:
Notes
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6.1
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AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
6.2
Package Drawings and Markings
20 Lead Thin Shrink Small Outline Package – TSSOP20
YYWWMZZ
AS5306
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YYWWMZZ
AS5304
Revision 1.9
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AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
6.3
Electrical Connection
The supply pins VDD, VDDP and VDDA are connected to +5V. Pins VSS and TEST_GND are connected to the supply ground. A
100nF decoupling capacitor close to the device is recommended.
1
VSS
Quadrature
Position A
2
3
Quadrature
Position B
HOST
uC
4
No Connect
5
7
Index
VDDP
ZPZ
TEST
TEST
B
TEST
TEST
VDDA
AO
TEST_GND
20
19
18
17
16
15
No Connect
No Connect
No Connect
0.1uF
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6
A
AS5304A,
AS5304B,
AS5306A,
AS5306B
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10K
AS5304B,
AS5306B
ONLY !
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VDD = 5V
8
No Connect
No Connect
10
INDEX
NC
TEST
TEST
TEST
14
No Connect
13
No Connect
12
No Connect
11
NC
NC
No Connect
Electrical connection of the AS5304/AS5306
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Figure 5:
9
VDD
Revision 1.9
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VDD = 5V
10uF
(optional)
Page 5 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
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).
N
40
Index Pulse
1
N
2
40
1
S
2
A
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)
40
1
2
40
B
Index
1
2
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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 o f Figure 7.
Detail:
A
B
Index
Step #
157 158 159
Figure 6:
7.1.2
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7.1.1
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7
0
1
2
3
4
5
Quadrature A / B and Index output
Magnetic Field Warning Indicator
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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:
Index = high
A=B=low
Vertical Distance between Magnet and IC
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7.1.3
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A low magnetic field is indicated with:
The recommended vertical distance between magnet and IC depends on the strength of the magnet and the length of the
magnetic pole.
Te
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
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Page 6 of 14
X=0
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Magnet drawn at
index position X=0
X
CW magnet
movement direction
N
S
4.220±0.235
Hall Array Center Line
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Index = High
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Pin 1
Chip Top view
3.0475±0.235
X=X1
X=0
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25µm (AS5304)
15µm (AS5306)
X
Magnet drawn at
position X1
(exaggerated)
CW magnet
movement direction
N
S
4.220±0.235
Hall Array Center Line
Pin 1
Chip Top view
Index = Low
3.0475±0.235
7.1.4
Magnet placement for index pulse generati on
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Figure 7:
Soft Stop Feature for Linear Movement Measurement
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When using long multi-pole strips, it may often be necessary to start from a defined home (or zero) position and obtain absolute
position information by counting the steps from the defined home position. The AS5304/AS5306 provide a soft stop feature that
eliminates the need for a separate electro-mechanical home position switch or an optical light barrier switch to indicate the
home position.
Te
The magnetic field warning indicator (see 7.1.2) together with the index pulse can be used to indicate a unique home position
on a magnetic strip:
1.
First the AS5304/AS5306 move to the end of the strip, until a magnetic field warning is displayed (Index = high,
A=B=low)
2.
Then, the AS5304/AS5306 move back towards the strip until the first index position is reached (note: an index position
is generated once for every pole pair, it is indicated with: Index = high, A=B= high). Depending on the polarity of the
strip magnet, the first index position may be generated when the end of the magnet strip only covers one half of the
Hall array. This position is not recommended as a defined home position, as the accuracy of the AS5304/AS5306 are
reduced as long as the multi-pole strip does not fully cover the Hall array.
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Page 7 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
3.
Incremental Hysteresis
Incremental
output
If the magnet is sitting right at the transition point between two steps, the
noise in the system may cause the incremental outputs to jitter back and
forth between these two steps, especially when the magnetic field is
weak.
Hysteresis:
1 LSB
X +4
X +3
X +2
X +1
X
X+1
X+2
X+3
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Magnet position
X
To avoid this unwanted jitter, a hysteresis has been implemented. The
hysteresis lies between 1 and 2 LSB, depending on device scattering.
Figure 8 shows an example of 1LSB hysteresis: the horizontal axis is the
lateral position of the magnet as it scans across the IC, the vertical axis
is the change of the incremental outputs, as they step forward (blue line)
with movement in +X direction and backward (red line) in –X direction.
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7.2
It is therefore recommended to continue to the next (second) index position from the end of the strip (Index = high,
A=B= high). This position can now be used as a defined home position.
X+4
Note: 1LSB = 25µm for AS5304, 15µm for AS5306
Movement direction: +X
Figure 8:
7.3
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Movement direction: -X
Hysteresis of the incremental output
Integral Non-Linearity (INL)
The INL (integral non-linearity) is the deviation between indicated position and actual position. It is better than 1LSB for both
AS5304 and AS5306, assuming an ideal magnet. Pole length variations and imperfections of the magnet material, which lead to
a non-sinusoidal magnetic field will attribute to additional linearity errors.
7.3.1
Error Caused by Pole Length Variations
140
120
100
80
60
40
20
0
1500
Figure 9 and Figure 10 show the error caused by a non-ideal
pole length of the multi-pole strip or ring.
Error [µm]
ca
Error [µm]
AS5304 Systematic Linearity Error caused by Pole
Length Deviation
1700
1900
2100
This is less of an issue with strip magnets, as they can be
manufactured exactly to specification using the proper
magnetization tooling.
2300
2500
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Pole Length [μm]
Figure 9:
Additional error caused by pole length variation: AS5304
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AS5306 Systematic Linearity Error caused by Pole
Length Deviation
140
120
100
80
60
40
20
0
However, when using a ring magnet (see Figure 1) the pole
length differs depending on the measurement radius. For
optimum performance it is therefore essential to mount the
IC such that the Hall sensors are exactly underneath the
magnet at the radius where the pole length is 2.0mm
(AS5304) or 1.2mm (AS5306), see also 8.1.2.
Error [µm]
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Error [µm]
900
1000
1100
1200
1300
1400
1500
Note that this is an additional error, which must be added to
the intrinsic errors INL (see 7.3) and DNL (see 7.4).
Pole Length [μm]
Figure 10:
Revision 1.9
Additional error caused by pole length variation: AS5306
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Page 8 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
7.4
Dynamic Non-Linearity (DNL)
1 LSB - DNL
12.5 µm
1 LSB
1 LSB + DNL
37.5 µm
1 LSB
15 µm
1 LSB + DNL
22.5 µm
lateral magnet movement
Figure 11:
8
1 LSB - DNL
7.5 µm
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25 µm
AS5306:
DNL (dynamic nonlinearity
)
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incremental output steps
incremental output steps
AS5304:
DNL (dynamic non-linearity)
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The DNL (dynamic non-linearity) describes the non-linearity of the incremental outputs from one step to the next. In an ideal
system, every change of the incremental outputs would occur after exactly one LSB (e.g. 25µm on AS5304). In practice
however, this step size is not ideal, the output state will change after 1LSB +/-DNL. The DNL must be <+/- ½ LSB to avoid a
missing code. Consequently, the incremental outputs will change when the magnet movement over the IC is
minimum 0.5 LSB and maximum 1.5 LSB’s.
lateral magnet movement
DNL of AS5304 (left) and AS5306 (right)
The AO Output
The Analog Output (AO) provides an analog output voltage that represents the Automatic Gain Control (AGC) of the Hall
sensors signal control loop.
This voltage can be used to monitor the magnetic field strength and hence the gap between magnet and chip surface:

Short distance between magnet and IC → strong magnet ic field → low loop gain → low AO voltage

Long distance between magnet and IC → weak magnetic field → high loop gain → high AO voltage
VAO [V]
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weak field,
high AGC
5.1
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Revision 1.9
1.2
0.5
recommended range
strong field,
low AGC
vertical gap
Figure 12:
AO output versus AGC, magnetic field strength , magnet-to-IC gap
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Page 9 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
8.1
Resolution and Maximum Rotating Speed
When using the AS5304/AS5306 in an off-axis rotary application, a multi-pole ring magnet must be used. Resolution, diameter
and maximum speed depend on the number of pole pairs on the ring.
8.1.1
Resolution
The angular resolution increases linearly with the number of pole pairs. One pole pair ha s a resolution (= interpolation factor) of
160 steps or 40 quadrature pulses.
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Resolution [steps] = [interpolation factor] x [number of pole pairs]
Resolution [bit] = log (resolution[steps]) / log (2)
Example: multi-pole ring with 22 pole pairs
= 160x22 = 3520 steps per revolution
= 40x22 = 880 quadrature pulses / revolution
8.1.2
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= 11.78 bits per revolution = 0.1023° per step
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Resolution
Multi-pole Ring Diameter
The length of a pole pair across the median of the multi-pole ring must remain fixed at either 4mm (AS5304) or 2.4mm
(AS5306). Hence, with increasing pole pair count, the diameter increases linearly with the number of pole pairs on the magnet ic
ring.
Magnetic ring diameter = [pole length] * [number of pole pairs] / π
for AS5304: d = 4.0mm * number of pole pairs / π
for AS5306: d = 2.4mm * number of pole pairs / π
Example: same as above: multi-pole ring with 22 pole pairs for AS5304
Ring diameter =
4 * 22 / 3.14 = 28.01mm (this number represents the median di ameter of the ring, this is where the
Hall elements of the AS5304/AS5306 should be placed; see Figure 4)
For the AS5306, the same ring would have a diameter of: 2.4 * 22 / 3.14 = 16.8mm
8.1.3
Maximum Rotation Speed
ca
The AS5304/AS5306 use a fast interpolation technique allowing an input frequency of 5kHz. This means, it can process
magnetic field changes in the order of 5000 pole pairs per second or 300 ,000 revolutions per minute. However, since a magnetic
ring consists of more than one pole pair, the above figure must be divided by the number of pole pairs to get the maximum
rotation speed:
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Maximum rotation speed = 300,000 rpm / [number of pole pairs]
Example: same as above: multi-pole ring with 22 pole pairs:
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Max. speed = 300,000 / 22 = 13,636 rpm (this is independent of the pole length)
8.1.4
Maximum Linear Travelling Speed
Te
For linear motion sensing, a multi-pole strip using equally spaced north and south poles is used. The pole length is again fixed
at 2.0mm for the AS5304 and 1.2mm for the A S5306. As shown in 8.1.3 above, the sensors can process up to 5000 pole pairs
per second, so the maximum travelling speed is:
Maximum linear travelling speed = 5000 * [pole pair length]
Example: linear multi-pole strip:
Max. linear travelling speed = 4mm * 5000 1/sec = 20 ,000mm/sec = 20m/sec
for AS5304
Max. linear travelling speed = 2.4mm * 5000 1/sec = 12 ,000mm/sec = 12m/sec
for AS5306
Revision 1.9
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Page 10 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
9
9.1
GENERAL DEVICE SPECIFICATIONS
Absolute Maximum Ratings (Non Operating)
Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device.
Min
Max
Unit
VDD
-0.3
7
V
Input pin voltage
V in
VSS-0.5
VDD+0.5
V
Input current (latchup immunity)
I scr
-100
100
mA
Norm: JESD78
kV
Norm: MIL 883 E method 3015
114.5
°C /W
Still Air / Single Layer PCB
150
°C
260
°C
85
%
Supply
ESD
+/-2
Package thermal resistance
Θ JA
Storage temperature
T strg
Soldering conditions
T body
Moisture Sensitive Level
9.2
5
MSL
Represents a maximum floor life time
of 168h
3
Operating Conditions
Parameter
Symbol
Positive supply voltage
AVDD
Digital supply voltage
DVDD
Negative supply voltage
Power supply current, AS5304
Power supply current, AS5306
Ambient temperature
Junction temperature
Min
Typ
Max
Unit
4.5
5.0
5.5
V
0.0
0.0
0.0
V
25
35
20
30
T amb
-40
125
°C
TJ
-40
150
°C
IDD
25
15
LSB
Integral nonlinearity
µm
2.5
LSB
DNL
±0.5
LSB
2
LSB
Hyst
1
Parameter
Symbol
Min
Power up time
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mA
INL
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Differential nonlinearity
Hysteresis
VSS
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Resolution
1.5
Note
A/B/Index, AO unloaded!
AS5304
AS5306
Ideal input signal
(ErrMax - ErrMin) / 2
No missing pulses.
optimum alignment
System Parameters
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9.3
Norm: IPC/JEDEC J-STD-020
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Humidity non-condensing
-55
Note
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Symbol
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Parameter
Propagation delay
Revision 1.9
Max
Unit
Note
T PwrUp
500
µs
Amplitude within valid range /
Interpolator locked, A B Index enabled
T Prop
20
µs
Time between change of input signal to
output signal
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Page 11 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
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.
Symbol
Min
Max
High level output voltage
V OH
0.8 VDD
Low level output voltage
V OL
Current source capability
I LOH
12
14
mA
Current sink capability
I LOL
13
15
mA
Short circuit limitation current
I Short
25
Capacitive load
CL
Load resistance
RL
Rise time
tR
1.2
µs
Fall time
tF
1.2
µs
0.4 + VSS
Unit
Note
V
Push/Pull mode
V
Push/Pull mode
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Typ
mA
Reduces maximum
operating temperature
20
pF
See Figure 13
820
Ω
See Figure 13
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39
Push/Pull mode
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Parameter
VDD = 5V
RL = 820Ω
A/B/Index
from
AS5304/6
TTL
74LS00
CL = 20pF
Figure 13:
9.5
Typical digital load
CAO Analogue Output Buffer
Parameter
Min
Typ
Max
Unit
Note
V OutRange
0.5
1
1.2
V
Strong field, min.
AGC
3
4
5.1
V
Weak field, max.
AGC
10
mV
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Minimum output voltage
Symbol
Maximum output voltage
V Offs
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Offset
V OutRange
Current sink / source capability
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Average short circuit current
IL
5
I Short
6
mA
40
mA
CL
10
pF
Bandwidth
BW
5
KHz
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Capacitive load
Revision 1.9
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Reduces maximum
Operating
Temperature
Page 12 of 14
AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Magnetic Input
Parameter
Symbol
Magnetic pole length
T FP
Magnetic amplitude
A mag
Operating dynamic input range
Magnetic offset
Magnetic temperature drift
Unit
Note
AS5304
mm
1.2
4.0
AS5306
AS5304
mm
2.4
10
60
1:6
1:12
±0.5
mT
T dmag
-0.2
%/K
5
kHz
0
AS5306
mT
Off mag
f mag
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AS5304 ordering guide
Device
Table 2:
Max
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Input frequency
Typ
2.0
L P_FP
Magnetic pole pair length
Table 1:
Min
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9.6
Resolution
Magnet Pole Length
Digital Outputs
AS5304A
25µm
2mm
Push Pull
AS5304B
25µm
2mm
Open Drain
Resolution
Magnet Pole Length
Digital Outputs
AS5306A
15µm
1.2mm
Push Pull
AS5306B
15µm
1.2mm
Open Drain
AS5306 ordering guide
Device
Note:
All products are RoHS compliant and austriamicrosystems green.
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Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
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For further information and requests, please contact us mailto: [email protected]
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or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Copyright
Copyright © 1997-2012, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria -Europe. Trademarks Registered ®. All
rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior
written consent ofthe copyright owner.
Disclaimer
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Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams
AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the
freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG f or
current information. This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life -support or
life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. For
shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test
flow or test location.
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The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to
recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of
use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or a rising
out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party
shall arise or flow out of ams AG rendering of technical or other services.
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