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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 ............................................................................................................................................................. 32