8-Bit Programmable High Speed Magnetic Rotary Encoder
1 General Description
The AS5030 is a contactless magnetic rotary encoder for accurate
angular measurement over a full turn of 360°.
It is a system-on-chip, combining integrated Hall elements, analog
front end and digital signal processing in a single device.
To measure the angle, only a simple two-pole magnet, rotating over
the center of the chip is required.
The absolute angle measurement provides instant indication of the
magnet’s angular position with a resolution of 8 bit = 256 positions
per revolution. This digital data is available as a serial bit stream and
as a PWM signal.
In addition to the angle information, the strength of the magnetic field
is also available as a 6-bit code.
Data transmission can be configured for 1-wire (PWM), 2-wires
(CLK, DIO) or 3-wires (CLK, DIO, CS).
A software programmable (OTP) zero position simplifies assembly
as the zero position of the magnet does not need to be mechanically
aligned.
A Power Down Mode together with fast startup- and measurement
cycles allows for very low average power consumption and makes
the AS5030 also suitable for battery operated equipment.
Figure 1. AS5030 Block Diagram
2 Key Features
360° contactless angular position encoding
Two digital 8-bit absolute outputs:
- Serial interface
- Pulse width modulated (PWM) output
User programmable zero position
Direct measurement of magnetic field strength allows exact
determination of vertical magnet distance
Serial read-out of multiple interconnected AS5030 devices
using daisy chain mode
Wide magnetic field input range: 20 ~ 80mT
Wide temperature range: -40°C to +125°C
Small Pb-free package: TSSOP 16
3 Applications
The AS5030 is suitable for Contactless rotary position sensing,
Rotary switches (human machine interface), AC/DC motor position
control, Robotics and Encoder for battery operated equipment.
Sin / Sinn / Cos / Cosn
AS5030
Angle
Sin
Cos
PWM
Decoder
PWM
DX
Hall Array
&
Front-end
Amplifier
Tracking
ADC &
Angle
Decoder
Mag
Zero
Position
Absolute
Serial
Interface
( SSI )
DIO
CS
CLK
C2
MagRngn
AGC
AGC
Power Management
OTP
PROG
www.ams.com/AS5030
Revision 2.4
1 - 44
AS5030
Datasheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
6.2 System Parameters ..............................................................................................................................................................................
6.4 Magnetic Field Alarm Limits .................................................................................................................................................................
6.5 Hall Element Sensitivity Options...........................................................................................................................................................
6.7 DC Characteristics of Digital Inputs and Outputs .................................................................................................................................
6.9 Serial 8-bit Output.................................................................................................................................................................................
6.10 General Data Transmission Timings ................................................................................................................................................
7.1 Connecting the AS5030......................................................................................................................................................................
7.2 Serial 3-Wire R/W Connection............................................................................................................................................................
7.3 Serial 3-Wire Read-only Connection ..................................................................................................................................................
7.4 Serial 2-Wire Connection (R/W Mode) ...............................................................................................................................................
7.5 Serial 2-Wire Continuous Readout .....................................................................................................................................................
7.6 Serial 2-Wire Differential SSI Connection...........................................................................................................................................
7.8 Analog Output.....................................................................................................................................................................................
7.9 Analog Sin/Cos Outputs with External Interpolator ............................................................................................................................
8 Application Information ...........................................................................................................................................................
8.3.1 Programming in Daisy Chain Mode ........................................................................................................................................... 26
www.ams.com/AS5030
Revision 2.4
2 - 44
AS5030
Datasheet - C o n t e n t s
8.5 AS5030 Status Indicators ...................................................................................................................................................................
8.5.1
8.5.2
8.5.3
8.5.4
C2 Status Bit..............................................................................................................................................................................
Lock Status Bit...........................................................................................................................................................................
Magnetic Field Strength Indicators ............................................................................................................................................
8.6 High Speed Operation ........................................................................................................................................................................
8.6.2 Total Propagation Delay of the AS5030 ................................................................................................................................... 30
8.7 Reduced Power Modes ......................................................................................................................................................................
30
8.7.1 Low Power Mode and Ultra-low Power Mode............................................................................................................................ 31
8.7.2 Power Cycling Mode.................................................................................................................................................................. 33
8.8 Accuracy of the Encoder System .......................................................................................................................................................
8.8.2 Vertical Distance of the Magnet................................................................................................................................................. 35
8.9 Choosing the Proper Magnet..............................................................................................................................................................
8.9.2 Lateral Displacement of the Magnet .......................................................................................................................................... 38
8.10 Physical Placement of the Magnet ...................................................................................................................................................
40
9 Package Drawings and Markings ...........................................................................................................................................
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