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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 around the center of the device and deliver a voltage representation of the
magnetic field at the surface of the IC.
Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5045
provides accurate high-resolution absolute angular position information. For this purpose a Coordinate Rotation
Digital Computer (CORDIC) calculates the angle and the magnitude of the Hall array signals.
The DSP is also used to provide digital information at the outputs M a g I N C n and M a g D E C n that indicate
movements of the used magnet towards or away from the device’s surface.
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). This PWM signal output also allows the generation of a direct
proportional analogue voltage, by using an external Low-Pass-Filter.
The AS5045 is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique
and Hall sensor conditioning circuitry.
Figure 4. AS5045 Block Diagram
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Revision 1.7
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相关代理商/技术参数
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制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:12-Bit Programmable Magnetic Position Sensor