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austriamicrosystems AG
austriamicrosystems AG

AS5040 Datasheet

PROGRAMMABLE MAGNETIC ROTARY ENCODER


AS5040 Datasheet Preview


General Description
AS5040
10Bit 360º Programmable Magnetic
Rotary Encoder
The AS5040 is a contactless magnetic rotary encoder for
accurate angular measurement over a full turn of 360°. It is a
system-on-chip, combining integrated Hall elements, analog
front end and digital signal processing in a single device.
To measure the angle, only a simple two-pole magnet, rotating
over the center of the chip, is required. The magnet may be
placed above or below the IC.
The absolute angle measurement provides instant indication of
the magnet’s angular position with a resolution of 0.35° = 1024
positions per revolution. This digital data is available as a serial
bit stream and as a PWM signal.
Furthermore, a user-programmable incremental output is
available, making the chip suitable for replacement of various
optical encoders.
An internal voltage regulator allows the AS5040 to operate at
either 3.3 V or 5 V supplies.
Ordering Information and Content Guide appear at end of
datasheet.
Figure 1:
Typical Arrangement of AS5040 and Magnet
ams Datasheet
[v2-11] 2015-Nov-20
Page 1
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AS5040− GeneralDescription
Figure 2:
Added Value of Using AS5040
Key Benefits & Features
The benefits and features of AS5040, 10Bit 360º Programmable
Magnetic Rotary Encoder are listed below:
Benefits
Highest reliability and durability
Simple programming
Multiple interfaces
Ideal for motor applications
Failure diagnostics
Easy setup
Great flexibility at a huge application
area
Fully automotive qualified
Small form factor
Robust environmental tolerance
Features
Contactless high resolution rotational position encoding
over a full turn of 360 degrees
Simple user-programmable resolution, pole pairs and zero
position
Serial communication interface (SSI)
10-bit pulse width modulated (PWM) output
Quadrature A/B and Index output signal
Step/Direction and Index output signal
3-Phase commutation for brushless DC motors
Rational speeds up to 30,000 rpm
Failure detection mode for magnet placement monitoring
and loss of power supply
Serial read-out of multiple interconnected devices using
daisy chain mode
Push button functionality detects movement of magnet in
Z-axis
AEC-Q100, grade 1
SSOP 16 (5.3mm x 6.2mm)
Wide temperature range: -40°C to 125°C
Applications
AS5040 is ideal for:
Industrial applications:
• Contactless rotary position sensing
• Robotics
• Brushless DC motor commutation
• Power tools
Automotive applications:
• Steering wheel position sensing
• Gas pedal position sensing
• Transmission gearbox encoder
• Headlight position control
• Power seat position indicator
Page 2
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ams Datasheet
[v2-11] 2015-Nov-20
Page 2

AS5040 − General Description
Figure 3:
AS5040 Block Diagram
Office equipment: printers, scanners, copiers
Replacement of optical encoders
Front panel rotary switches
Replacement of potentiometers
Block Diagram
The functional blocks of this device are shown below:
VDD5V
VDDV3V
LDO 3.3V
Hall Array
&
Frontend
Amplifier
Cos
DSP
Ang
Mag
OTP
Register
Programming
Parameters
PWM
Interface
Absolute
Interface
(SSI)
Incremental
Interface
MagINCn
MagDECn
PWM_LSB
DO
CSn
CLK
A_LSB_U
B_Dir_V
Index_W
Prog
ams Datasheet
[v2-11] 2015-Nov-20
Page 3
Document Feedback
Page 3
Part Number AS5040
Manufactur austriamicrosystems AG
Description PROGRAMMABLE MAGNETIC ROTARY ENCODER
Total Page 30 Pages
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