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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 ................................................................................................................................

1

1

1

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3

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

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

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

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

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7

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

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

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

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9

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

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

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

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

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

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

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

12

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..........................................................................................................................................................................

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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..............................................................................................................................................................

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

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

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

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

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