AS5030 8-BIT Programmable Magnetic Rotary Encoder

Rev. 1.0

30-04- 06

www.austriamicr osystems.com

Page 1 of 3

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: Typical arrangement of AS 5030 and magnet

1.1

Benefits

-

Complete system-on-chip, no calibration

required

-

Flexible system solution provides absolute

output, with serial data 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

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 packages: TSSOP 16

3

Applications

-

Industrial applications:

- Contactless rotary position sensing

- Rotary switches (human machine interface)

- AC/DC motor position control

- Robotics

-

Encoder for battery operated equipment

-

Automotive applications:

- Steering wheel position sensing

- Dashboard rotary switches

- Headlight position control

Figure 2: AS 5030 block diagram

AS5030

8-BIT PROGRAMMABLE HIGH SPEED ABSOLUTE

MAGNETIC ROTARY ENCODER

PRELIMINARY DATA SHEET

TENTATIVE FACT SHEET

tracking ADC

tracking ADC

tracking ADC

tracking ADC

&

&

&

& Angle

Angle

Angle

Angle

decoder

decoder

decoder

decoder

Hall Array

Hall Array

Hall Array

Hall Array

&

&

&

&

Frontend

Frontend

Frontend

Frontend

Amplifier

Amplifier

Amplifier

Amplifier

power management

power management

power management

power management

OTP

OTP

OTP

OTP

Absolute

Absolute

Absolute

Absolute

Serial

Serial

Serial

Serial

Interface

Interface

Interface

Interface

((((SSI

SSI

SSI

SSI))))

DIO

PWM

CLK

PROG

CS

PWM

PWM

PWM

PWM

Decoder

Decoder

Decoder

Decoder

Cos

Sin

AGC

AGC

AGC

AGC

DX

C2

Mag

Zero

Zero

Zero

Zero

Pos

Pos

Pos

Pos....

AGC

Angle

MagRngn

AS5030

8 BIT PROGRAMMABLE HIGH SPEED

MAGNETIC ROTARY ENCODER