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AS5311

Datasheet - C o n t en t s

Contents

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

2 Key Features............................................................................................................................................................................. 1

3 Applications............................................................................................................................................................................... 1

4 Pin Assignments ....................................................................................................................................................................... 3

4.1 Pin Descriptions.................................................................................................................................................................................... 3

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

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

6.1 Operating Conditions............................................................................................................................................................................ 6

6.2 DC Characteristics for Digital Inputs and Outputs................................................................................................................................ 6

6.2.1 CMOS Schmitt-Trigger Inputs: CLK, CSn (CSn = internal Pull-up) ............................................................................................. 6

6.2.2 CMOS Output Open Drain: MagINCn, MagDECn ....................................................................................................................... 6

6.2.3 CMOS Output: PWM ................................................................................................................................................................... 6

6.2.4 Tristate CMOS Output: DO.......................................................................................................................................................... 7

6.3 Magnetic Input Specification................................................................................................................................................................. 7

6.4 Electrical System Specifications........................................................................................................................................................... 8

6.5 Timing Characteristics .......................................................................................................................................................................... 9

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

7 Detailed Description................................................................................................................................................................ 10

7.1 Incremental Outputs ........................................................................................................................................................................... 11

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

7.2 Incremental Output Hysteresis ........................................................................................................................................................... 12

7.3 Synchronous Serial Interface (SSI) .................................................................................................................................................... 12

7.4 Absolute Output Jitter and Hysteresis ................................................................................................................................................ 14

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) .................................................................................................................... 14

7.6 Pulse Width Modulation (PWM) Output.............................................................................................................................................. 15

7.7 3.3V / 5V Operation............................................................................................................................................................................ 16

8 Application Information ........................................................................................................................................................... 18

8.1 Magnetization ..................................................................................................................................................................................... 19

8.2 Position of the Index Pulse................................................................................................................................................................. 19

8.3 Mounting the Magnet.......................................................................................................................................................................... 20

8.3.1 Vertical Distance........................................................................................................................................................................ 20

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.............................................................................................................................................................. 22

8.5 AS5311 Off-axis Rotary Applications.................................................................................................................................................. 23

9 Package Drawings and Markings ........................................................................................................................................... 25

9.1 Recommended PCB Footprint............................................................................................................................................................ 26

10 Ordering Information............................................................................................................................................................. 28