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AS5145

Data Sheet - C o n t e n t s

Contents

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

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

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

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

4.1 Pin Descriptions.................................................................................................................................................................................... 4

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

6

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

7

6.1 Magnetic Input Specification................................................................................................................................................................. 8

6.2 System Specifications .......................................................................................................................................................................... 9

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

11

8 Detailed Description................................................................................................................................................................ 12

8.1 Mode_Index Pin.................................................................................................................................................................................. 12

8.1.1 Synchronous Serial Interface (SSI) ........................................................................................................................................... 13

8.1.2 Incremental Mode ...................................................................................................................................................................... 14

8.1.3 Sync Mode................................................................................................................................................................................. 16

8.1.4 Sin/Cosine Mode ....................................................................................................................................................................... 16

8.1.5 Daisy Chain Mode ..................................................................................................................................................................... 16

8.2 Pulse Width Modulation (PWM) Output.............................................................................................................................................. 17

8.2.1 Changing the PWM Frequency.................................................................................................................................................. 18

8.3 Analog Output..................................................................................................................................................................................... 18

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

19

9.1 Programming the AS5145 .................................................................................................................................................................. 19

9.1.1 Zero Position Programming ....................................................................................................................................................... 19

9.1.2 OTP Memory Assignment.......................................................................................................................................................... 20

9.1.3 User Selectable Settings ........................................................................................................................................................... 20

9.1.4 OTP Default Setting................................................................................................................................................................... 21

9.1.5 Redundancy ............................................................................................................................................................................... 21

9.1.6 Redundant Programming Option ............................................................................................................................................... 22

9.1.7 OTP Register Entry and Exit Condition ..................................................................................................................................... 22

9.2 Alignment Mode.................................................................................................................................................................................. 23

9.3 3.3V / 5V Operation............................................................................................................................................................................ 23

9.4 Selecting Proper Magnet.................................................................................................................................................................... 24

9.4.1 Physical Placement of the Magnet ............................................................................................................................................ 25

9.4.2 Magnet Placement..................................................................................................................................................................... 26

9.5 Simulation Modeling ........................................................................................................................................................................... 26

9.6 Failure Diagnostics............................................................................................................................................................................. 27

9.6.1 Magnetic Field Strength Diagnosis ............................................................................................................................................ 27

9.6.2 Power Supply Failure Detection ................................................................................................................................................ 27

9.7 Angular Output Tolerances................................................................................................................................................................. 27

9.7.1 Accuracy .................................................................................................................................................................................... 27

9.7.2 Transition Noise......................................................................................................................................................................... 29

9.7.3 High Speed Operation ............................................................................................................................................................... 29

9.7.4 Propagation Delays ................................................................................................................................................................... 29

9.7.5 Internal Timing Tolerance .......................................................................................................................................................... 30

9.7.6 Temperature .............................................................................................................................................................................. 30