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AS5311: 产品描述High Resolution Magnetic Linear Encoder; 文件大小1MB，共32页; 制造商AMS; 官网地址https://ams.com/zh

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AS5311概述

High Resolution Magnetic Linear Encoder

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A S 5 3 11

High Resolution Magnetic Linear Encoder

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

1.95µm 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

3.3 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 3).

Figure 1. AS5311 Block Diagram

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

VDD3V3

MagINCn

MagDECn

VDD5V

LDO 3.3V

PWM

Interface

Sin

Ang

PWM

Linear Hall

Array

Frontend

Amplifier

Cos

DSP

Mag

Absolute

Interface

(SSI)

CSn

CLK

OTP

Programming

Parameters

Incremental

Interface

Index

Prog

AS5311

www.ams.com/AS5311

Revision 1.13

1 - 32

AS5311

Datasheet - C o n t e n t s

Contents

1 General Description ..................................................................................................................................................................

2 Key Features.............................................................................................................................................................................

3 Applications...............................................................................................................................................................................

4 Pin Assignments .......................................................................................................................................................................

4.1 Pin Descriptions....................................................................................................................................................................................

5 Absolute Maximum Ratings ......................................................................................................................................................

6 Electrical Characteristics...........................................................................................................................................................

6.1 Operating Conditions............................................................................................................................................................................

6.2 DC Characteristics for Digital Inputs and Outputs ................................................................................................................................

6.2.1

6.2.2

6.2.3

6.2.4

CMOS Schmitt-Trigger Inputs: CLK, CSn (CSn = internal Pull-up) .............................................................................................

CMOS Output Open Drain: MagINCn, MagDECn .......................................................................................................................

CMOS Output: PWM ...................................................................................................................................................................

Tristate CMOS Output: DO..........................................................................................................................................................

6.3 Magnetic Input Specification.................................................................................................................................................................

6.4 Electrical System Specifications...........................................................................................................................................................

6.5 Timing Characteristics ..........................................................................................................................................................................

6.5.1 Pulse Width Modulation Output ................................................................................................................................................... 9

7 Detailed Description................................................................................................................................................................

7.1 Incremental Outputs ...........................................................................................................................................................................

7.2 Incremental Output Hysteresis ...........................................................................................................................................................

7.3 Synchronous Serial Interface (SSI) ....................................................................................................................................................

7.4 Absolute Output Jitter and Hysteresis ................................................................................................................................................

7.1.1 Incremental Power-up Lock Option ........................................................................................................................................... 11

7.4.1 Adding a Digital Hysteresis........................................................................................................................................................ 14

7.4.2 Implementing Digital Filtering .................................................................................................................................................... 14

7.5 Z-axis Range Indication (“Red/Yellow/Green” Indicator) ....................................................................................................................

7.6 Pulse Width Modulation (PWM) Output..............................................................................................................................................

7.7 3.3V / 5V Operation ............................................................................................................................................................................

8 Application Information ...........................................................................................................................................................

8.1 Magnetization .....................................................................................................................................................................................

8.2 Position of the Index Pulse .................................................................................................................................................................

8.3 Mounting the Magnet..........................................................................................................................................................................

8.3.1 Vertical Distance........................................................................................................................................................................ 19

8.3.2 Alignment of Multi-pole Magnet and IC...................................................................................................................................... 20

8.3.3 Lateral Stroke of Multi-pole Strip Magnets................................................................................................................................. 20

8.4 Measurement Data Example ..............................................................................................................................................................

8.5 AS5311 Off-axis Rotary Applications..................................................................................................................................................

8.6 Programming the AS5311 ..................................................................................................................................................................

8.6.1 Zero Position Programming ....................................................................................................................................................... 25

8.6.2 User Selectable Settings ........................................................................................................................................................... 26

9 Package Drawings and Markings ...........................................................................................................................................

9.1 Recommended PCB Footprint............................................................................................................................................................

10 Ordering Information.............................................................................................................................................................

www.ams.com/AS5311

Revision 1.13

2 - 32

AS5311相似产品对比

	AS5311	AS5311-ATST-1000	AS5311-ATST	AS5311-ATST-500
描述	High Resolution Magnetic Linear Encoder	Rotary Position Sensor 5.5V/3.6V Digital Output 20-Pin TSSOP T/R	Rotary Position Sensor 5.5V/3.6V Digital Output 20-Pin TSSOP T/R	Rotary Position Sensor 5.5V/3.6V Digital Output 20-Pin TSSOP T/R

AS5311

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