AS5030_1 Datasheet, PDF (1/33 Pages) ams AG – 8 BIT PROGRAMMABLE HIGH SPEED MAGNETIC ROTARY ENCODER

AS5030
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.
DATA SHEET
1.2 Key Features
• 360°contactless angular position encoding
• Two digital 8-bit absolute outputs:
- Serial interface and
- Pulse width modulated (PWM) output
• User programmable zero position
• High speed: up to 30,000 rpm
• 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
1.3 Applications
• Contactless rotary position sensing
• Rotary switches (human machine interface)
• AC/DC motor position control
• Robotics
• Encoder for battery operated equipment
Figure 1: Typical arrangement of AS5030 and magnet
1.1 Benefits
• Complete system-on-chip, no calibration
required
• Flexible system solution provides absolute serial
and PWM output
• Ideal for applications in harsh environments due to
magnetic sensing principle
• High reliability due to non-contact sensing
• Robust system, tolerant to horizontal misalignment,
airgap variations, temperature variations and
external magnetic fields
1.4 Block Diagram
Sin / Sinn / Cos / Cosn
Hall Array
&
Frontend
Amplifier
Angle
Sin
tracking ADC _Zero
Cos
& Angle
Pos.
decoder
Mag
AGC
AGC
power management
OTP
PWM
Decoder
Absolute
Serial
Interface
(SSI)
Figure 2: AS5030 block diagram
PWM
DX
DIO
CS
CLK
C2
MagRngn
PROG
Rev. 1.8
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