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AS5245

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.................................................................................................................................................................................... 5

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

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

8.2.1 Serial Data Contents.................................................................................................................................................................. 13

8.2.2 Z-axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator)........................................................................... 14

8.2.3 Incremental Mode ...................................................................................................................................................................... 14

8.2.4 Sync Mode................................................................................................................................................................................. 16

8.2.5 Sine/Cosine Mode ..................................................................................................................................................................... 16

8.2.6 Daisy Chain Mode ..................................................................................................................................................................... 16

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

8.3.1 Changing the PWM Frequency.................................................................................................................................................. 18

8.4 Analog Output..................................................................................................................................................................................... 18

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

19

9.1 Programming the AS5245 .................................................................................................................................................................. 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 ............................................................................................................................................... 21

9.2 Alignment Mode.................................................................................................................................................................................. 22

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

9.4 Choosing the Proper Magnet.............................................................................................................................................................. 24

9.5 Failure Diagnostics............................................................................................................................................................................. 25

9.5.1 Magnetic Field Strength Diagnosis............................................................................................................................................ 25

9.5.2 Power Supply Failure Detection ................................................................................................................................................ 25

9.6 Angular Output Tolerances................................................................................................................................................................. 25

9.6.1 Accuracy.................................................................................................................................................................................... 25

9.6.2 Transition Noise......................................................................................................................................................................... 27

9.6.3 High Speed Operation ............................................................................................................................................................... 27

9.6.4 Propagation Delays ................................................................................................................................................................... 28

9.6.5 Internal Timing Tolerance .......................................................................................................................................................... 28

9.6.6 Temperature .............................................................................................................................................................................. 28

9.6.7 Accuracy over Temperature ...................................................................................................................................................... 28

9.7 AS5245 Differences to AS5045.......................................................................................................................................................... 29