AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS5040-ASST' PDF : 61 Pages View PDF
AS5040 − Functional Description
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 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 40).
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 Figure 36). 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 34). 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.
ams Datasheet
[v2-12] 2017-Jun-20
Page 17
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