AS5145B-HSST-500【PDF 2/2 页】IC ENCODER ROTARY MAGN 16-SSOP

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Sheet目录60

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www.ams.com/AS5145

Revision 1.17

2 - 36

AS5145

Datasheet - Contents

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............................................................................................................................................................................ 24

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

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

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

9.5 Failure Diagnostics............................................................................................................................................................................. 26

9.5.1 Magnetic Field Strength Diagnosis............................................................................................................................................ 26

9.5.2 Power Supply Failure Detection ................................................................................................................................................ 26

9.6 Angular Output Tolerances................................................................................................................................................................. 26

9.6.1 Accuracy.................................................................................................................................................................................... 26

9.6.2 Transition Noise......................................................................................................................................................................... 28

9.6.3 High Speed Operation............................................................................................................................................................... 28

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

9.6.5 Internal Timing Tolerance.......................................................................................................................................................... 29

9.6.6 Temperature.............................................................................................................................................................................. 29

9.6.7 Accuracy over Temperature ...................................................................................................................................................... 29

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