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AS5045B

Datasheet - Contents

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

6.2 System Specifications .......................................................................................................................................................................... 8

7 Timing Characteristics ............................................................................................................................................................

10

8 Detailed Description................................................................................................................................................................

11

8.1 Synchronous Serial Interface (SSI) .................................................................................................................................................... 11

8.2 Incremental Mode............................................................................................................................................................................... 13

8.3 Daisy Chain Mode .............................................................................................................................................................................. 14

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

8.4.1 Changing the PWM Frequency.................................................................................................................................................. 16

8.5 Analog Output..................................................................................................................................................................................... 16

9 Application Information ...........................................................................................................................................................

17

9.1 Programming the AS5045B................................................................................................................................................................ 17

9.1.1 Zero Position Programming ....................................................................................................................................................... 17

9.1.2 OTP Memory Assignment.......................................................................................................................................................... 18

9.1.3 User Selectable Settings ........................................................................................................................................................... 18

9.1.4 OTP Default Setting................................................................................................................................................................... 19

9.1.5 Redundancy............................................................................................................................................................................... 19

9.1.6 Redundant Programming Option ............................................................................................................................................... 20

9.1.7 OTP Register Entry and Exit Condition ..................................................................................................................................... 20

9.2 Alignment Mode.................................................................................................................................................................................. 21

9.3 3.3V / 5V Operation............................................................................................................................................................................ 22

9.4 Selecting Proper Magnet.................................................................................................................................................................... 22

9.4.1 Physical Placement of the Magnet ............................................................................................................................................ 23

9.4.2 Magnet Placement..................................................................................................................................................................... 24

9.5 Failure Diagnostics............................................................................................................................................................................. 24

9.5.1 Magnetic Field Strength Diagnosis ............................................................................................................................................ 24

9.5.2 Power Supply Failure Detection ................................................................................................................................................ 24

9.6 Angular Output Tolerances................................................................................................................................................................. 24

9.6.1 Accuracy .................................................................................................................................................................................... 24

9.6.2 Transition Noise......................................................................................................................................................................... 26

9.6.3 High Speed Operation ............................................................................................................................................................... 26

9.6.4 Propagation Delays ................................................................................................................................................................... 26

9.6.5 Internal Timing Tolerance .......................................................................................................................................................... 27

9.6.6 Temperature .............................................................................................................................................................................. 27

9.6.7 Accuracy over Temperature ...................................................................................................................................................... 27

10 Package Drawings and Markings ......................................................................................................................................... 28

10.1 Recommended PCB Footprint.......................................................................................................................................................... 30

11 Ordering Information .............................................................................................................................................................

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