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AS5030 8-BIT Programmable Magnetic Rotary Encoder
AS5030
AS5030 8-BIT PROGRAMMABLE HIGH SPEED ABSOLUTE 8 BIT PROGRAMMABLE HIGH SPEED MAGNETIC ROTARY ENCODER MAGNETIC ROTARY ENCODER
TENTATIVE FACT SHEET
PRELIMINARY DATA SHEET
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General Description 2
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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.
Key Features
360contactless 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: - 40C to + 125C Small Pb-free packages: TSSOP 16
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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
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Figure 1: Typical arrangement of AS5030 and magnet
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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
Hall Array & Frontend Amplifier
Sin Cos
PWM Decoder
Angle
PWM DX
tracking ADC & Angle decoder
Zero Pos. Pos.
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Mag
AGC
Absolute Serial Interface SSI) (SSI)
DIO CS CLK C2 MagRngn
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AGC power management
OTP
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PROG
Figure 2: AS5030 block diagram
Rev. 1.0 30-04-06
www.austriamicrosystems.com
Page 1 of 3
AS5030 8-BIT Programmable Magnetic Rotary Encoder
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Package and Pinout
The AS5030 is available in a TSSOP16 package
Figure 3: TSSOP-16 package and pin-out
Pin# Symbol TSSOP Type Description
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
MagRngn Prog_DI VSS Test3 Test2 Test1 Test0 NC DX CLK CS DIO VDD C1 C2 PWM
DO_T S S DO DI_ST DI_ST DIO S DI DI DO
Push-Pull output. Will be low when magnetic field strength is too weak, e.g. due to missing magnet OTP Programming voltage supply pin Supply ground This pin is used for factory testing. For normal operation it must be left unconnected This pin is used for factory testing. For normal operation it must be left unconnected This pin is used for factory testing. For normal operation it must be left unconnected This pin is used for factory testing. For normal operation it must be left unconnected must be left unconnected Digital output for 2-wire operation and Daisy Chain mode Clock Input of Synchronous Serial Interface; Schmitt-Trigger input Chip Select for serial data transmission, active high; Schmitt-Trigger input, external pull-down resistor (~50k) required in read-only mode Data output / command input for digital serial interface Positive supply voltage, 4.5 to 5.5 V Configuration input: connect to VSS for normal operation Configuration input: connect to VSS for 3-wire operation, connect to VDD for 2wire operation Pulse Width Modulation output, 2 s pulse width per step (2 s....512 s)
Table 1: Pin description
Pin types: S: DI_ST: DIO:
supply pin digital input / Schmitt-Trigger bi-directional digital pin
DO: DO_T: DI:
digital output digital output / tri-state digital input
Rev. 1.0 30-04-06
www.austriamicrosystems.com
Page 2 of 3
AS5030 8-BIT Programmable Magnetic Rotary Encoder
Contact
Headquarters
austriamicrosystems AG A 8141 Schloss Premstatten, Austria Phone: +43 3136 500 0 www.austriamicrosystems.com
Fax:
+43 3136 525 01
Copyright
Devices sold by austriamicrosystems are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems for current information. This product is intended for use in normal commercial applications. Copyright (c) 2007 austriamicrosystems. Trademarks registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accurate and correct. However, austriamicrosystems shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems rendering of technical or other services.
Rev. 1.0 30-04-06
www.austriamicrosystems.com
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