AS5045-ASST datasheet(13/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

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AS5045 − Detailed 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 MagINCn and MagDECn 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 30).

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 11:

Typical Arrangement of AS5045 and Magnet

Detailed Description

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