as5045 austriamicrosystems, as5045 Datasheet
as5045
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as5045 Summary of contents
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... 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 digital signal processing in a single device. ...
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... 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 13) and programming mode (Figure 9) ...
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... Revision 1.2, 03-Oct-06 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 that indicate Pulse Width Modulated signal at pin 12 (PWM) ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 4.1 Synchronous Serial Interface (SSI) CSn T t CLK/2 CLK FE 1 CLK DO D11 D10 valid t DO active Angular Position Data Figure 4: Synchronous serial interface with absolute angular position data If CSn changes to logic low, Data Out (DO) will change from high impedance (tri-state) to logic high and the read-out will be initiated ...
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... No distance change Off Magnetic input field OK ( GREEN range, ~45…75mT) YELLOW range: magnetic field is ~ 25…45mT or ~75…135mT. The AS5045 may Off still be operated in this range, but with slightly reduced accuracy. RED range: magnetic field is ~<25mT or >~135mT still possible to operate the On AS5045 in the red range, but not recommended ...
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... 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 5 below). This mode is accomplished by connecting the data output (DO; pin 9) to the data input (PROG; pin 8) of the subsequent device. The serial data of all connected devices is read from the DO pin of the first device in the chain ...
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... PWM Figure 7: PWM output signal 5.1 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 7). With PWMhalfEN = 0 the PWM timing is as shown in Table 6: Parameter Symbol Typ Unit ...
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... Therefore it is recommended that bits that are already programmed are set to “0” during a programming cycle. PROG 7.3 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 9) without a subsequent OTP programming cycle. ...
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... CSn Mode 7 10 VSS CLK 8 9 Prog_DI DO + 10n AS5045 1µF Cap only required for OTP programming Figure 11: OTP programming connection of AS5045 (shown with AS5045 demoboard) Revision 1.2, 03-Oct- ositio n Programming Mode 1 t PrgH t PrgR ...
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... To put the AS5045 in Analog Readback Mode, a digital sequence must be applied to pins CSn, PROG and CLK as shown in Figure 12. The digital level for this pin depends on the supply configuration (3. ...
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... CSn Figure 14: Exiting alignment mode 9 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 ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 10 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). ...
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... Figure 19: Arrangement of Hall sensor array on chip (principle) With reference to Figure 19, 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 ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER each pin must be connected to the positive supply at pin 16 (VDD5V). By hardware: PWM output: The PWM output is a constant stream of pulses with 1kHz repetition frequency. In case of power loss, these pulses are missing 13 Angular Output Tolerances 13.1 Accuracy Accuracy is defined as the error between measured angle and actual angle ...
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... High Speed Operation 13.3.1 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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... Revision 1.2, 03-Oct-06 13.6 Temperature 13.6.1 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 ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 14 Electrical Characteristics 14.1 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 (12bits data + 6 bits status) OTP write: 18 bits ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 14.3 Operating Conditions Parameter Ambient temperature Supply current Supply voltage at pin VDD5V Voltage regulator output voltage at pin VDD3V3 Supply voltage at pin VDD5V Supply voltage at pin VDD3V3 14.4 DC Characteristics for Digital Inputs and Outputs 14.4.1 CMOS Schmitt-Trigger Inputs: CLK, CSn. (CSn = internal Pull-up) (operating conditions -40 to +125° ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 14.4.4 CMOS Output: PWM (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted Parameter High level output voltage Low level output voltage Output current 14.4.5 Tristate CMOS Output: DO (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted) ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 14.6 Electrical System Specifications (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted Parameter Symbol Resolution RES Integral non-linearity (optimum) INL opt Integral non-linearity (optimum) INL temp Integral non-linearity INL Differential non-linearity ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 15 Timing Characteristics Synchronous Serial Interface (SSI) (operating conditions -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted Parameter Symbol Data output activated (logic t DO active high) First data shifted to output t CLK FE register Start of data output ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 16 Package Drawings and Markings 16-Lead Shrink Small Outline Package SSOP-16 AYWWIZZ AS5045 Dimensions mm Symbol Min Typ Max Min A 1.73 1.86 1.99 .068 A1 0.05 0.13 0.21 .002 A2 1.68 1.73 1.78 .066 b 0.25 0.315 0.38 .010 c 0.09 - 0.20 .004 D 6.07 6.20 6.33 .239 E 7.65 7.8 7.9 .301 E1 5.2 5.3 5.38 .205 e 0.65 K 0° - 8° 0° L 0.63 0.75 0.95 .025 17 Ordering Information Delivery: Tape and Reel (1 reel = 2000 devices) Tubes (1 box = 100 tubes á ...
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... AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER 18 Recommended PCB Footprint: 19 Revision History Revision Date Update description of Alignment Mode (8) and OTP programming (7.2, 7.3), Table 2, 1.2 Oct. 03, 2006 (14.5), 1.1 Mar. 24, 2006 Added OTP prog. timing table 15.2, New Figure 10, Figure 11 1.0 Dec. 7, 2004 Initial revision Sep. 26, 2005 Official release Jan ...