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AS5040 Datasheet(PDF) 3 Page - ams AG

Part # AS5040
Description  10 BIT 360째 PROGRAMMABLE MAGNETIC ROTARY ENCODER
Download  28 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS5040 Datasheet(HTML) 3 Page - ams AG

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Revision 1.6, 03-Oct-06
www.austriamicrosystems.com
Page 3 of 28
Pin 8 (Prog) is also used to program the different
incremental interface modes, the incremental resolution
and the zero position into the OTP (see page 11).
This pin is also used as digital input to shift serial data
through the device in Daisy Chain configuration,
(see page 5).
Pin 11 Chip Select (CSn; active low) selects a device
within a network of AS5040 encoders and initiates serial
data transfer. A logic high at CSn puts the data output
pin (DO) to tri-state and terminates serial data transfer.
This pin is also used for alignment mode (page 13) and
programming mode (page 9).
Pin 12 allows a single wire output of the 10-bit absolute
position value. The value is encoded into a pulse width
modulated signal with 1µs pulse width per step (1µs to
1024µs over a full turn). By using an external low pass
filter, the digital PWM signal is converted into an analog
voltage, allowing a direct replacement of potentiometers.
3
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
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 19).
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 11). 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 14). 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.
DSP
Hall Array
&
Frontend
Amplifier
OTP
Register
Programming
Parameters
Absolute
Interface
(SSI)
Incremental
Interface
Sin
Cos
Ang
Mag
MagINCn
MagDECn
DO
PWM_LSB
CLK
A_LSB_U
B_Dir_V
Index_W
Prog
CSn
PWM
Interface
VDD5V
VDDV3V
LDO 3.3V
Figure 3: AS5040 block diagram


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