AS5045_V1 AMSCO [austriamicrosystems AG], AS5045_V1 Datasheet
AS5045_V1
Related parts for AS5045_V1
AS5045_V1 Summary of contents
Page 1
AS5045 12 Bit Programmable Magnetic Rotary Encoder 1 General Description The AS5045 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360° system-on-chip, combining integrated Hall elements, analog front end and ...
Page 2
AS5045 Data Sheet Table of Contents 1 General Description ................................................................................................................................ 1 2 Benefits................................................................................................................................................... 1 3 Key Features .......................................................................................................................................... 1 4 Applications ............................................................................................................................................ 1 5 Pinout ..................................................................................................................................................... 4 5.1 Pin Configuration .................................................................................................................................... 4 5.2 Pin Description........................................................................................................................................ 4 6 Electrical Characteristics......................................................................................................................... 5 ...
Page 3
AS5045 Data Sheet 15 Simulation Modeling...............................................................................................................................25 16 Failure Diagnostics ................................................................................................................................26 16.1 Magnetic Field Strength Diagnosis .........................................................................................................26 16.2 Power Supply Failure Detection .............................................................................................................26 17 Angular Output Tolerances.....................................................................................................................26 17.1 Accuracy ................................................................................................................................................26 17.2 Transition Noise .....................................................................................................................................28 17.3 High Speed Operation............................................................................................................................28 17.3.1 Sampling Rate........................................................................................................................................28 ...
Page 4
AS5045 Data Sheet 5 Pinout 5.1 Pin Configuration Figure 2. Pin Configuration SSOP16 5.2 Pin Description Table 1 shows the description of each pin of the standard SSOP16 package (Shrink Small Outline Package, 16 leads, body size: 5.3mm x 6.2mmm; ...
Page 5
AS5045 Data Sheet Pin Symbol Type Mode - 7 VSS S 8 Prog_DI DI_PD 9 DO DO_T 10 CLK DI CSn DI_PU PWM VDD3V3 ...
Page 6
AS5045 Data Sheet Building Block AS5045 Propagation delay 384µs (slow mode) 96µs (fast mode) Transition noise 0.03 degrees max. (slow mode) (rms; 1sigma) 0.06 degrees max. (fast mode) OTP programming Zero position, rotational direction, PWM disable, 2 Magnetic Field indicator ...
Page 7
AS5045 Data Sheet 6.4 DC Characteristics for Digital Inputs and Outputs 6.4.1 CMOS Schmitt-Trigger Inputs: CLK, CSn. (CSn = internal Pull-up) (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) amb unless ...
Page 8
AS5045 Data Sheet 6.4.5 Tristate CMOS Output: DO (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) amb unless otherwise noted) Parameter High level output voltage Low level output voltage Output current ...
Page 9
AS5045 Data Sheet 6.6 Electrical System Specifications (operating conditions -40 to +125°C, VDD5V = 3.0~3.6V (3V operation) VDD5V = 4.5~5.5V (5V operation) amb unless otherwise noted) Parameter Symbol Resolution Integral non-linearity (optimum) Integral non-linearity (optimum) Integral non-linearity Differential ...
Page 10
AS5045 Data Sheet Figure 3. Integral and Differential Non-linearity (example) α 12bit code 4095 2048 0 0 ° Integral Non-Linearity (INL) is the maximum deviation between actual position and indicated position. Differential Non-Linearity (DNL) is the maximum ...
Page 11
AS5045 Data Sheet 6.7.2 Pulse Width Modulation Output (operating conditions -40 to +125°C, VDD5V = 3.0~3.6V (3V operation) VDD5V = 4.5~5.5V (5V operation) amb unless otherwise noted) Parameter Symbol PWM frequency f PWM Minimum pulse width PW Maximum ...
Page 12
AS5045 Data Sheet 7 Functional Description The AS5045 is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing the magnetic field distribution across the surface of the chip. The integrated Hall elements are placed ...
Page 13
AS5045 Data Sheet 8 Mode Input Pin The mode input pin activates or deactivates an internal filter that is used to reduce the analog output noise. Activating the filter (Mode pin = LOW) provides a reduced output noise of 0.03° ...
Page 14
AS5045 Data Sheet 8.1.1 Data Content D11:D0 absolute angular position data (MSB is clocked out first) OCF (Offset Compensation Finished), logic high indicates the finished Offset Compensation Algorithm COF (Cordic Overflow), logic high indicates an out of range error in ...
Page 15
AS5045 Data Sheet Table 5. Magnetic Field Strength Red-yellow-green Indicator (OTP option) Status Bits Hardware Pins Mag Mag Mag LIN INC DEC INCn Off All other combinations n/a Note: ...
Page 16
AS5045 Data Sheet Figure 7. Daisy Chain Mode Data Transfer CSn T t CLK/2 CLK FE 1 CLK DO D11 D10 valid t DO active 9 Pulse Width Modulation (PWM) Output The AS5045 provides a pulse width ...
Page 17
AS5045 Data Sheet 9.1 Changing the PWM Frequency The PWM frequency of the AS5045 can be divided by two by setting a bit (PWMhalfEN) in the OTP register (see chapter 11). With PWMhalfEN = 0 the PWM timing is as ...
Page 18
AS5045 Data Sheet 11 Programming the AS5045 After power-on, programming the AS5045 is enabled with the rising edge of CSn and Prog = logic high. 16 bit configuration data must be serially shifted into the OTP register via the Prog ...
Page 19
AS5045 Data Sheet 11.3 Non-permanent Programming It is also possible to re-configure the AS5045 in a non-permanent way by overwriting the OTP register. This procedure is essentially a “Write Data” sequence (see Figure 10) without a subsequent OTP programming cycle. ...
Page 20
AS5045 Data Sheet Figure 12. OTP Programming Connection of AS5045 (shown with AS5045 demoboard) 11.4 Analog Readback Mode Non-volatile programming (OTP) uses on-chip zener diodes, which become permanently low resistive when subjected to a specified reverse current. The quality of ...
Page 21
AS5045 Data Sheet Figure 13. OTP Register Analog Read ProgEN OutpEN CSn Internal PROG test bit digital CLK t LoadProg 12 Alignment Mode The alignment mode simplifies centering the magnet over the center of the chip to gain maximum accuracy. ...
Page 22
AS5045 Data Sheet 13 3. Operation The AS5045 operates either at 3.3V ±10 ±10%. This is made possible by an internal 3.3V Low-Dropout (LDO) Voltage regulator. The internal supply voltage is always taken from the ...
Page 23
AS5045 Data Sheet 14 Choosing the Proper Magnet Typically the magnet should be 6mm in diameter and ≥2.5mm in height. Magnetic materials such as rare earth AlNiCo/SmCo5 or NdFeB are recommended. The magnetic field strength perpendicular to the die surface ...
Page 24
AS5045 Data Sheet 14.1 Physical Placement of the Magnet The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the chip as shown in the drawing below: Figure 18. Defined Chip ...
Page 25
AS5045 Data Sheet 15 Simulation Modeling Figure 20. Arrangement of Hall Sensor Array on Chip (principle) With reference to Figure 20, a diametrically magnetized permanent magnet is placed above or below the surface of the AS5045. The chip uses an ...
Page 26
AS5045 Data Sheet The chip will continue to operate, but with degraded output linearity, if the signal field strength is outside the recommended range. Too strong magnetic fields will introduce errors due to saturation effects in the internal preamplifiers. Too ...
Page 27
AS5045 Data Sheet Figure 21. Example of Linearity Error over XY Misalignment The maximum non-linearity error on this example is better than ±1 degree (inner circle) over a misalignment radius of ~0.7mm. For volume production, the placement tolerance of the ...
Page 28
AS5045 Data Sheet 17.2 Transition Noise Transition noise is defined as the jitter in the transition between two steps. Due to the nature of the measurement principle (Hall sensors + Preamplifier + ADC), there is always a certain degree of ...
Page 29
AS5045 Data Sheet 17.4 Propagation Delays The propagation delay is the delay between the time that the sample is taken until it is converted and available as angular data. This delay is 96µs in fast mode and 384µs in slow ...
Page 30
AS5045 Data Sheet 17.6 Temperature 17.6.1 Magnetic Temperature Coefficient One of the major benefits of the AS5045 compared to linear Hall sensors is that it is much less sensitive to temperature. While linear Hall sensors require a compensation of the ...
Page 31
AS5045 Data Sheet 18 Package Drawings and Markings Figure 23. 16-Lead Shrink Small Outline Package SSOP-16 Dimensions mm Symbol Min Typ Max 2. 1.65 1.75 1.85 b 0.22 - 0.38 c 0.09 ...
Page 32
AS5045 Data Sheet 20 Recommended PCB Footprint Figure 24. Recommended PCB Footprint Table 8. Recommended Footprint Data Recommended Footprint Data mm A 9.02 0.355 B 6.16 0.242 C 0.46 0.018 D 0.65 0.025 E 5.01 0.197 www.austriamicrosystems.com inch Revision 1.7 ...
Page 33
AS5045 Data Sheet Copyrights Copyright © 1997-2010, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the ...