AS5045 datasheet(8/24 Pages) AMSCO

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AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.5

www.austriamicrosystems.com

Page 8 of 24

Parameter

Symbol

Min

Typ

Max

Unit

Note

Programmed Zener Voltage (log.1)

Vprogrammed

100

Unprogrammed Zener Voltage (log. 0)

Vunprogrammed

VRef-VPROG during Analog

Readback mode (see 8.4)

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

MagI NCn

and

M agDECn

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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