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AS5145B-HSST Datasheet(PDF) 2 Page - ams AG |
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AS5145B-HSST Datasheet(HTML) 2 Page - ams AG |
2 / 36 page 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 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