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AS5040 Datasheet(PDF) 10 Page - ams AG

Part No. AS5040
Description  10Bit 360 Programmable Magnetic Rotary Encoder
Download  34 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5040 Datasheet(HTML) 10 Page - ams AG

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AS5040
Data Sheet
www.austriamicrosystems.com
Revision 2.10
9 - 33
6
Functional Description
The AS5040 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 AS5040
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 agI NCn and M agDE Cn 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 20).
The AS5040 senses the orientation of the magnetic field and calculates a 10-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).
Besides the absolute angular position information the device simultaneously provides incremental output signals. The
various incremental output modes can be selected by programming the OTP mode register bits (see page 19). As
long as no programming voltage is applied to pin Prog, the new setting may be overwritten at any time and will be
reset to default when power is turned off. To make the setting permanent, the OTP register must be programmed (see
Figure 15). The default setting is a quadrature A/B mode including the Index signal with a pulse width of 1 LSB. The
Index signal is logic high at the user programmable zero position.
The AS5040 is tolerant to magnet misalignment and magnetic stray fields due to differential measurement technique
and Hall sensor conditioning circuitry.
Figure 4: AS5040 Block Diagram


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