AS5045B 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS5045B

12-Bit Programmable Magnetic Position Sensor

austriamicrosystems AG 

AS5045B

Datasheet - Detailed Description

8 Detailed Description

The AS5045B 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 AS5045B 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 16).

The AS5045B 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 analog voltage, by using an external Low-Pass-Filter. The AS5045B is tolerant to

magnet misalignment and magnetic stray fields due to differential measurement technique and Hall sensor conditioning circuitry.

Figure 4. Typical Arrangement of AS5045B and Magnet

8.1 Synchronous Serial Interface (SSI)

Figure 5. Synchronous Serial Interface with Absolute Angular Position Data

CSn

TCLK/2

tCLK FE

CLK

1

8

tCSn tCLK FE

18

1

DO

D11 D10 D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OCF COF

LIN

Mag Mag Even

INC DEC PAR

D11

tDO active

tDO valid

Angular Position Data

Status Bits

tDO Tristate

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