AS5045-ASSU austriamicrosystems, AS5045-ASSU Datasheet
AS5045-ASSU
Specifications of AS5045-ASSU
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AS5045-ASSU Summary of contents
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... Flexible system solution provides absolute and PWM outputs simultaneously Ideal for applications in harsh environments due to contactless position sensing No calibration required Figure 1. Typical Arrangement of AS5045 and Magnet www.austriamicrosystems.com 3 Key Features Contactless high resolution rotational position encoding over a full turn of 360 degrees Two digital 12bit absolute outputs: ...
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... Applications ............................................................................................................................................ 1 5 Pinout ..................................................................................................................................................... 4 5.1 Pin Configuration .................................................................................................................................... 4 5.2 Pin Description........................................................................................................................................ 4 6 Electrical Characteristics......................................................................................................................... 5 6.1 AS5045 Differences to AS5040 ............................................................................................................... 5 6.2 Absolute Maximum Ratings (non operating) ............................................................................................ 6 6.3 Operating Conditions .............................................................................................................................. 6 6.4 DC Characteristics for Digital Inputs and Outputs.................................................................................... 7 6.4.1 CMOS Schmitt-Trigger Inputs: CLK, CSn. (CSn = internal Pull-up) .......................................................... 7 6.4.2 CMOS / Program Input: Prog ...
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... 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 17.4 Propagation Delays ................................................................................................................................29 17.4.1 Angular Error Caused by Propagation Delay ..........................................................................................29 17 ...
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... This pin is also used as digital input to shift serial data through the device in Daisy Chain configuration, (see chapter 8.2 Daisy Chain Mode). Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5045 encoders and initiates serial data transfer. A logic high at CSn puts the data output pin (DO) to tri-state and terminates serial data transfer. This pin is also used for alignment mode (Figure 14) and programming mode (Figure 10) ...
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... DO digital output DI_PD digital input pull-down DI_PU digital input pull-up 6 Electrical Characteristics 6.1 AS5045 Differences to AS5040 All parameters are according to AS5040 datasheet except for the parameters shown below: Building Block AS5045 Resolution 12bits, 0.088°/step. Data length Read: 18bits ...
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... 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 modes, 2 ...
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... 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 otherwise noted) Parameter High level input voltage Low level input voltage ...
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... 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 Tri-state leakage current 6.5 Magnetic Input Specification (operating conditions -40 to +125° ...
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... 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 non-linearity Transition noise Power-on reset thresholds On voltage; 300mV typ. ...
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... 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 deviation of the step length from one position to the next. ...
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... 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 pulse width PW Note: when OTP bit “PWMhalfEn” is set, the PWM pulse width PW is doubled (PWM frequency f 6 ...
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... A small low cost diametrically magnetized (two-pole) standard magnet provides the angular position information (see Figure 17). The AS5045 senses the orientation of the magnetic field and calculates a 12-bit binary code. This code can be accessed via a Synchronous Serial Interface (SSI). In addition, an absolute angular representation is given by a Pulse Width Modulated signal at pin 12 (PWM) ...
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... 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° rms. At the same time, the output delay is increased to 384µs. This mode is recommended for high precision, low speed applications. ...
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... Z-axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator) The AS5045 provides several options of detecting movement and distance of the magnet in the Z-direction. Signal indicators MagINCn and MagDECn are available both as hardware pins (pins 1 and 2) and as status bits in the serial data stream (see Figure 5). Additionally, an OTP programming option is available with bit MagCompEn (see ...
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... It is low in all other cases (see Table 4 and Table 5). 8.2 Daisy Chain Mode The Daisy Chain mode allows connection of several AS5045’s in series, while still keeping just one digital input for data transfer (see “Data IN” in Figure 6 below). This mode is accomplished by connecting the data output (DO; pin 9) to the data input (PROG ...
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... 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 modulated output (PWM), whose duty cycle is proportional to the measured angle: ⋅ t 4097 = − Position off The PWM frequency is internally trimmed to an accuracy of ± ...
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... 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 shown in Table 6: Table 6. PWM Signal Parameters (default mode) Parameter PWM frequency ...
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... OTP register. 11.2 Repeated OTP Programming Although a single AS5045 OTP register bit can be programmed only once (from possible to program other, unprogrammed bits in subsequent programming cycles. However, a bit that has already been programmed should not be programmed twice. Therefore it is recommended that bits that are already programmed are set to “ ...
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... 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. The “Write Data” sequence may be applied at any time during normal operation. This configuration remains set while the power supply voltage is above the power-on reset level (see 6 ...
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... In order to verify the quality of the programmed bit, an analog level can be read for each zener diode, giving an indication whether this particular bit was properly programmed or not. To put the AS5045 in Analog Readback Mode, a digital sequence must be applied to pins CSn, PROG and CLK as shown in Figure 13. The digital level for this pin depends on the supply configuration (3.3V or 5V; see section Operation) ...
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... 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. Alignment mode can be enabled with the falling edge of CSn while Prog = logic high (Figure 14). The Data bits D11-D0 of the SSI change to a 12-bit displacement amplitude output ...
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... 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 output of the LDO, meaning that the internal blocks are always operating at 3.3V. ...
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... 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 has the range of ±45mT…±75mT (peak). The magnet’s field strength should be verified using a gauss-meter. The magnetic field B a concentric circle with a radius of 1.1mm (R1), should be in the range of ± ...
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... 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 Center and Magnet Displacement Radius 2.433 mm 2.433 mm Magnet Placement The magnet’ ...
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... With reference to Figure 20, a diametrically magnetized permanent magnet is placed above or below the surface of the AS5045. The chip uses an array of Hall sensors to sample the vertical vector of a magnetic field distributed across the device package surface. The area of magnetic sensitivity is a circular locus of 1.1mm radius with respect to the center of the die ...
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... Power Supply Failure Detection By software: If the power supply to the AS5045 is interrupted, the digital data read by the SSI will be all “0”s. Data is only valid, when bit OCF is high, hence a data stream with all “0”s is invalid. To ensure adequate low levels in the failure case, a pull-down resistor (~10kΩ ...
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... 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 IC within the package (±0.235mm) must also be taken into account. ...
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... High Speed Operation 17.3.1 Sampling Rate The AS5045 samples the angular value at a rate of 2.61k (slow mode) or 10.42k (fast mode, selectable by pin MODE) samples per second. Consequently, the absolute outputs are updated each 384µs (96µs in fast mode stationary position of the magnet, the sampling rate creates no additional error. ...
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... AS5045. 17.5 Internal Timing Tolerance The AS5045 does not require an external ceramic resonator or quartz. All internal clock timings for the AS5045 are generated by an on-chip RC oscillator. This oscillator is factory trimmed to ±5% accuracy at room temperature (±10% over full temperature range). This tolerance influences the ADC sampling rate and the pulse width of the PWM output: Absolute output ...
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... 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 magnet’s temperature coefficients, the AS5045 automatically compensates for the varying magnetic field strength over temperature. The magnet’s temperature drift does not need to be considered, as the AS5045 operates with magnetic field strengths from ± ...
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... Ordering Information Delivery: Tape and Reel (1 reel = 2000 devices) Tubes (1 box = 100 tubes à 77 devices) Order # AS5045ASSU for delivery in tubes Order # AS5045ASST for delivery in tape and reel www.austriamicrosystems.com Marking: YYWWIZZ Y: Last Digit of Manufacturing Year inch WW: Manufacturing Week Min ...
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... 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 32 – 33 ...
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... 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 copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. ...