AS5311-ATST

AS5311-ATST Datasheet

AS5311 Data Sheet

Part	Datasheet
AS5311-ATST	AS5311-ATST (pdf)

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AS5311 Data Sheet AS5311 High Resolution Magnetic Linear Encoder Preliminary Data Sheet 1 General Description The AS5311 is a contactless high resolution magnetic linear encoder for accurate linear motion and off-axis rotary sensing with a resolution down to <0.5µm. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing on a single chip, packaged in a small 20-pin TSSOP package. A multi-pole magnetic strip or ring with a pole length of 1.0mm is required to sense the rotational or linear motion. The magnetic strip is placed above the IC at a distance of typ. 0.3mm. The absolute measurement provides instant indication of the magnet position within one pole pair with a resolution of 488nm per step 12-bit over 2.0mm . This digital data is available as a serial bit stream and as a PWM signal. Furthermore, an incremental output is available with a resolution of µm per step. An index pulse is generated once for every pole pair once per 2.0mm .The travelling speed in incremental mode is up to 650mm/second. An internal voltage regulator allows the AS5311 to operate at either V or 5 V supplies. Depending on the application the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both radial and axial magnetized see Figure 1 and Figure Figure AS5311 with Multi-pole Magnetic Strip for Linear Motion Sensing The AS5311 is available in a Pb-free TSSOP-20 package and qualified for an ambient temperature range from -40°C to +125°C. 2 Key Features Two 12-bit digital absolute outputs - Serial interface and - Pulse width modulated PWM output Incremental output with Index “red-yellow-green” indicators monitor magnet placement over the chip 3 Applications Micro-Actuator feedback Servo drive feedback Robotics Replacement of optical encoders Figure Block Diagram of AS5311 1 - 24 AS5311 Data Sheet Figure AS5311 with Multi-pole Ring Magnets for Off-axis Rotary Motion Sensing 2 - 24 AS5311 Data Sheet 4 Table of Contents 1 General Description 1 2 Key Features 1 3 1 4 Table of Contents 3 5 Pinout 5 Pin Assignments 5 Pin Description 5 6 Electrical 6 Absolute Maximum Ratings 6 Operating Conditions 7 DC Characteristics for Digital Inputs and Outputs 7 CMOS Schmitt-Trigger Inputs CLK, CSn = internal Pull-up 7 CMOS Output Open Drain MagINCn, MagDECn 7 CMOS Output PWM 7 Tristate CMOS Output DO 8 Magnetic Input 8 Electrical System Specifications 8 Timing Characteristics 9 Synchronous Serial Interface SSI 9 Pulse Width Modulation 10 7 Detailed 10 Incremental 11 Incremental Power-up Lock Option 11 Incremental Output 12 Synchronous Serial Interface SSI 12 Data Contents 13 Absolute Output Jitter and Hysteresis 14 Adding a Digital Hysteresis 14 Implementing Digital Filtering 14 Z-axis Range Indication “Red/Yellow/Green” 14 8 Pulse Width Modulation PWM Output 15 9 3.3V / 5V Operation 15 10 Magnet Specifications 16 Magnetization 16 Position of the Index 17 Mounting the Magnet 17 Vertical Distance 17 Alignment of Multi-pole Magnet and 17 Lateral stroke of Multi-pole Strip Magnets 17 11 Measurement Data 19 3 - 24 AS5311 Data Sheet 4 - 24 AS5311 Data Sheet 5 Pinout Pin Assignments Figure AS5311 Pin Configuration, TSSOP-20 MagIncn MagDecn Index Prog AS5311 VDD5V VDD3V3 Pin Description Pin 4 A , 5 B and 7 Index are the incremental outputs. The incremental output has a resolution of 10-bit per pole pair, resulting in a step length of 1.95µm. Note that Pin 14 CSn must be low to enable the incremental outputs. Pins 12, 13 and 14 are used for serial data transfer. Chip Select CSn active low initiates serial data transfer. CLK is the clock input and DO is the data output. A logic high at CSn puts the data output pin DO to tri-state and terminates serial data transfer. CSn must be low to enable the incremental outputs. See for further options. Pin 8 is the supply ground pin. Pins 18 and 19 are the positive supply pins. For 5V operation, connect the 5V supply to pin 19 and add a buffer capacitor at pin For 3.3V operation, connect both pins 18 and 19 to the 3.3V supply. Pin 9 is used for factory programming only. It should be connected to VSS. Pins 2 and 3 are the magnetic field change indicators, MagINCn and MagDECn magnetic field strength increase or decrease through variation of the distance between the magnet and the device . These outputs can be used to detect the valid magnetic field range. External pull-up resistors are required at these pins. See for maximum output currents on these pins. Since they are open-drain outputs they can also be combined wired-and . Pin 15 PWM allows a single wire output of the 12-bit absolute position value within one pole pair 2.0mm . The value is encoded into a pulse width modulated signal with 1µs pulse width per step 1µs to 4097µs over one pole pair . Pins 6, 10, 11, 16, 17 and 20 are for internal use and must not be connected. 5 - 24 AS5311 Data Sheet Table Pin Description MagINCn MagDECn Index Prog VDD3V3 VDD5V Type - DO_OD DO_OD DO S DI_PD DO_T DI, ST DI_PU, ST Must be left unconnected Magnet Field Magnitude INCrease active low, indicates a distance reduction between the magnet and the device surface. Magnet Field Magnitude DECrease active low, indicates a distance increase between the device and the magnet. Incremental output A Incremental output B Must be left unconnected Incremental output Index. Negative Supply Voltage GND OTP Programming Input for factory programming. Connect to VSS Must be left unconnected Must be left unconnected Data Output of Synchronous Serial Interface Clock Input of Synchronous Serial Interface Schmitt-Trigger input Chip Select, active low Schmitt-Trigger input, internal pull-up resistor Must be low to enable incremental outputs Pulse Width Modulation of approx. 244Hz 1µs/step Must be left unconnected Must be left unconnected 3V-Regulator output internally regulated from VDD5V. Connect to VDD5V for 3V supply voltage. Do not load externally. Positive Supply Voltage, to V Must be left unconnected DO_OD DO DI_PD DI_PU digital output open drain digital output digital input pull-down digital input pull-up S DI DO_T ST supply pin digital input digital output /tri-state Schmitt-Trigger input 6 Electrical Characteristics 14 Ordering Information Delivery: Tape and Reel 1 reel = 1000 devices 1 reel = 4500 devices Tubes 1 box = 100 tubes à 74 devices Order # AS5311ASSU for delivery in tubes Order # AS5311ASST for delivery in tape and reel 15 Recommended PCB Footprint Recommended Footprint Data inch 22 - 24 AS5311 Data Sheet Date 26-Jun-09-Apr-10 24-Sep-10 14-March-11 Owner jja, jlu agt mub Description Recommended footprint data updated Delivery information updated Fig.9 updated Table Parity bit change IC Marking Fig. 17 17 Copyrights Copyright 2010, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria Europe. Trademarks Registered 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. All products and companies mentioned are trademarks or registered trademarks of their respective companies. 18 Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG 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 AG 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 AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG 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 AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 23 - 24 AS5311 Data Sheet For Sales Offices, Distributors and Representatives, please visit: 24 - 24

PDF Datasheet Preview

AS5311 Data Sheet

AS5311

High Resolution Magnetic Linear Encoder

Preliminary Data Sheet
1 General Description

The AS5311 is a contactless high resolution magnetic linear encoder for accurate linear motion and off-axis rotary sensing with a resolution down to <0.5µm. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing on a single chip, packaged in a small 20-pin TSSOP package. A multi-pole magnetic strip or ring with a pole length of 1.0mm is required to sense the rotational or linear motion. The magnetic strip is placed above the IC at a distance of typ. 0.3mm. The absolute measurement provides instant indication of the magnet position within one pole pair with a resolution of 488nm per step 12-bit over 2.0mm . This digital data is available as a serial bit stream and as a PWM signal. Furthermore, an incremental output is available with a resolution of µm per step. An index pulse is generated once for every pole pair once per 2.0mm .The travelling speed in incremental mode is up to 650mm/second. An internal voltage regulator allows the AS5311 to operate at either V or 5 V supplies. Depending on the application the AS5311 accepts multi-pole strip magnets as well as multi-pole ring magnets, both radial and axial magnetized see Figure 1 and Figure

Figure AS5311 with Multi-pole Magnetic Strip for Linear Motion Sensing

The AS5311 is available in a Pb-free TSSOP-20 package and qualified for an ambient temperature range from -40°C to +125°C.
2 Key Features

Two 12-bit digital absolute outputs - Serial interface and - Pulse width modulated PWM output

Incremental output with Index “red-yellow-green” indicators monitor magnet placement over the chip
3 Applications

Micro-Actuator feedback Servo drive feedback Robotics Replacement of optical encoders

Figure Block Diagram of AS5311
1 - 24

AS5311 Data Sheet

Figure AS5311 with Multi-pole Ring Magnets for Off-axis Rotary Motion Sensing
2 - 24

AS5311 Data Sheet
4 Table of Contents
1 General Description 1 2 Key Features 1 3 1 4 Table of Contents 3 5 Pinout 5

Pin Assignments 5 Pin Description 5 6 Electrical 6 Absolute Maximum Ratings 6 Operating Conditions 7 DC Characteristics for Digital Inputs and Outputs 7

CMOS Schmitt-Trigger Inputs CLK, CSn = internal Pull-up 7 CMOS Output Open Drain MagINCn, MagDECn 7 CMOS Output PWM 7 Tristate CMOS Output DO 8 Magnetic Input 8 Electrical System Specifications 8 Timing Characteristics 9 Synchronous Serial Interface SSI 9 Pulse Width Modulation 10 7 Detailed 10 Incremental 11 Incremental Power-up Lock Option 11 Incremental Output 12 Synchronous Serial Interface SSI 12 Data Contents 13 Absolute Output Jitter and Hysteresis 14 Adding a Digital Hysteresis 14 Implementing Digital Filtering 14 Z-axis Range Indication “Red/Yellow/Green” 14 8 Pulse Width Modulation PWM Output 15 9 3.3V / 5V Operation 15 10 Magnet Specifications 16 Magnetization 16 Position of the Index 17 Mounting the Magnet 17 Vertical Distance 17 Alignment of Multi-pole Magnet and 17 Lateral stroke of Multi-pole Strip Magnets 17 11 Measurement Data 19
3 - 24

AS5311 Data Sheet
4 - 24

AS5311 Data Sheet
5 Pinout

Pin Assignments

Figure AS5311 Pin Configuration, TSSOP-20

MagIncn

MagDecn

Index

Prog

AS5311

VDD5V

VDD3V3

Pin Description

Pin 4 A , 5 B and 7 Index are the incremental outputs. The incremental output has a resolution of 10-bit per pole pair, resulting in a step length of 1.95µm. Note that Pin 14 CSn must be low to enable the incremental outputs.

Pins 12, 13 and 14 are used for serial data transfer. Chip Select CSn active low initiates serial data transfer. CLK is the clock input and DO is the data output. A logic high at CSn puts the data output pin DO to tri-state and terminates serial data transfer. CSn must be low to enable the incremental outputs. See for further options.

Pin 8 is the supply ground pin. Pins 18 and 19 are the positive supply pins. For 5V operation, connect the 5V supply to pin 19 and add a buffer capacitor at pin For 3.3V operation, connect both pins 18 and 19 to the 3.3V supply.

Pin 9 is used for factory programming only. It should be connected to VSS.

Pins 2 and 3 are the magnetic field change indicators, MagINCn and MagDECn magnetic field strength increase or decrease through variation of the distance between the magnet and the device . These outputs can be used to detect the valid magnetic field range. External pull-up resistors are required at these pins. See for maximum output currents on these pins. Since they are open-drain outputs they can also be combined wired-and .

Pin 15 PWM allows a single wire output of the 12-bit absolute position value within one pole pair 2.0mm . The value is encoded into a pulse width modulated signal with 1µs pulse width per step 1µs to 4097µs over one pole pair .

Pins 6, 10, 11, 16, 17 and 20 are for internal use and must not be connected.
5 - 24

AS5311 Data Sheet

Table Pin Description

MagINCn

MagDECn

Index

Prog

VDD3V3

VDD5V

Type -

DO_OD

DO_OD

DO S DI_PD

DO_T DI, ST

DI_PU, ST

Must be left unconnected Magnet Field Magnitude INCrease active low, indicates a distance reduction between the magnet and the device surface. Magnet Field Magnitude DECrease active low, indicates a distance increase between the device and the magnet. Incremental output A Incremental output B Must be left unconnected Incremental output Index. Negative Supply Voltage GND OTP Programming Input for factory programming. Connect to VSS Must be left unconnected Must be left unconnected Data Output of Synchronous Serial Interface Clock Input of Synchronous Serial Interface Schmitt-Trigger input Chip Select, active low Schmitt-Trigger input, internal pull-up resistor Must be low to enable incremental outputs Pulse Width Modulation of approx. 244Hz 1µs/step Must be left unconnected Must be left unconnected 3V-Regulator output internally regulated from VDD5V. Connect to VDD5V for 3V supply voltage. Do not load externally. Positive Supply Voltage, to V Must be left unconnected

DO_OD DO DI_PD DI_PU
digital output open drain digital output digital input pull-down digital input pull-up

S DI DO_T ST
supply pin digital input digital output /tri-state Schmitt-Trigger input
6 Electrical Characteristics
14 Ordering Information

Delivery:

Tape and Reel 1 reel = 1000 devices 1 reel = 4500 devices

Tubes 1 box = 100 tubes à 74 devices

Order # AS5311ASSU for delivery in tubes Order # AS5311ASST for delivery in tape and reel
15 Recommended PCB Footprint

Recommended Footprint Data
inch
22 - 24

AS5311 Data Sheet

Date 26-Jun-09-Apr-10 24-Sep-10 14-March-11

Owner jja, jlu
agt mub

Description Recommended footprint data updated Delivery information updated Fig.9 updated Table Parity bit change IC Marking Fig. 17
17 Copyrights

Copyright 2010, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria Europe. Trademarks Registered 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. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
18 Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG 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 AG 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 AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG 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 AG rendering of technical or other services.

Contact Information

Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01
23 - 24

AS5311 Data Sheet

For Sales Offices, Distributors and Representatives, please visit:
24 - 24

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Datasheet ID: AS5311-ATST 519756