AS5304/AS5306
Integrated Hall ICs for Linear and
Off-Axis Rotary Motion Detection
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/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 -40°C to 125°C.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v2-00] 2017-May-03
Page 1
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AS5304/AS5306 −
General Description
Key Benefits and Features
The benefits and features of this device are listed below:
Figure 1:
Added Value of Using AS5304/AS5306
Benefits
•
Contactless motion and position sensing
•
High speed measurement
•
Robust against external magnetic stray fields
Features
•
Highest reliability and durability in harsh environments
•
Control of high speed movements
•
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:
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
•
4.5V 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
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ams Datasheet
[v2-00] 2017-May-03
AS5304/AS5306 −
General Description
Block Diagram
The functional blocks of the AS5304 and AS5306 are shown
below:
Figure 2:
Functional Blocks of the AS5304/06
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
ams Datasheet
[v2-00] 2017-May-03
Page 3
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AS5304/AS5306 −
Pin Assignments
Pin Assignments
Figure 3:
Pin Assignments (Top View)
VSS
A
VDDP
B
TEST
AO
VDD
INDEX
NC
NC
1
2
20
19
ZPZ
TEST
TEST
TEST
VDDA
TEST_GND
TEST
TEST
TEST
NC
4
5
6
7
8
9
10
AS5304 / AS5306
3
18
17
16
15
14
13
12
11
Figure 4:
Pin Description
Pin
Number
1
2
3
4
5,12,13,
14,17,18,19
6
7
8
Pin Name
VSS
A
VDDP
B
TEST
AO
VDD
Index
Pin Type
Supply pin
Digital output push pull or
open drain (programmable)
Supply pin
Digital output push pull or
open drain (programmable)
Analog input/output
Analog output
Supply pin
Digital output push pull or
open drain (programmable)
Supply ground
Description
Incremental quadrature position output A.
Short circuit current limitation
Peripheral supply pin, connect to VDD
Incremental quadrature position output B.
Short Circuit Current Limitation
Test pins, must be left open
AGC Analog Output. (Used to detect low
magnetic field strength)
Positive supply pin
Index output, active HIGH. Short Circuit
Current Limitation
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ams Datasheet
[v2-00] 2017-May-03
AS5304/AS5306 −
Pin Assignments
Pin
Number
9,10,11
15
16
20
Pin Name
TEST
TEST_GND
Pin Type
Analog input/output
Supply pin
Description
Test pins, must be left open
Test pin, must be connected to VSS
Hall Bias Supply Support (connected to VDD)
VDDA Hall
ZPZmskdis
Digital input
Test input, connect to VSS during operation
ams Datasheet
[v2-00] 2017-May-03
Page 5
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