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General Description
AS5304/AS5306
Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection
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 (AS5304A) 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.
Datasheet, Public [v3-00] 2022-Jan-24
Page 1 Document Feedback
AS5304/AS5306− GeneralDescription
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.
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Datasheet, Public [v3-00] 2022-Jan-24
AS5304/AS5306 − General Description
Figure 2: Functional Blocks of the AS5304/06
Block Diagram
The functional blocks of the AS5304 and AS5306 are shown below:
S IN
Hall Array
&
Frontend
Amplifier
CO S
SIN
Signal
Processing
&
Channel
Amplifier
C OS
Automatic Gain
Control
AS5304 / AS5306
ADC & DSP
magnetic field alarm
A/ B Quadrature Incremental Interface
& Index
Analog Output
A B Index
AO
Datasheet, Public [v3-00] 2022-Jan-24
Page 3 Document Feedback
Pin Assignments
Figure 3: Pin Assignments (Top View)
VSS
1
A
2
VDDP
3
B
4
TEST
5
AO
6
VDD
7
INDEX
8
NC
9
NC
10
AS5304 / AS5306
AS5304/AS5306 − Pin Assignments
20
ZPZ
19
TEST
18
TEST
17
TEST
16
VDDA
15
TEST_GND
14
TEST
13
TEST
12
TEST
11
NC
Figure 4: Pin Description
Pin Number
Pin Name
Pin Type
Description
1
VSS
Supply pin
Supply ground
2
A
Digital output push pull or Incremental quadrature position output A. open drain (programmable) Short circuit current limitation
3
VDDP
Supply pin
Peripheral supply pin, connect to VDD
4
B
Digital output push pull or Incremental quadrature position output B. open drain (programmable) Short Circuit Current Limitation
5,12,13, 14,17,18,19
6
TEST AO
Analog input/output Analog output
Test pins, must be left open
AGC Analog Output. (Used to detect low magnetic field strength)
7
VDD
Supply pin
Positive supply pin
8
Index
Digital output push pull or Index output, active HIGH. Short Circuit open drain (programmable) Current Limitation
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Datasheet, Public [v3-00] 2022-Jan-24
AS5304/AS5306 − Pin Assignments
Pin Number
9,10,11 15 16 20
Pin Name
Pin Type
TEST TEST_GND VDDA Hall ZPZmskdis
Analog input/output Supply pin Digital input
Description
Test pins, must be left open Test pin, must be connected to VSS Hall Bias Supply Support (connected to VDD) Test input, connect to VSS during operation
Datasheet, Public [v3-00] 2022-Jan-24
Page 5 Document Feedback
AS5304/AS5306− AbsoluteMaximumRatings
Absolute Maximum Ratings
Figure 5: Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratin.