AS5043
Programmable 360° Magnetic Angle
Encoder with Absolute SSI and Analog
Outputs
General Description
The AS5043 is a contactless magnetic angle encoder for
accurate measurement up to 360°.
It is a system-on-chip, combining integrated Hall elements,
analog front end and digital signal processing in a single device.
The AS5043 provides a digital 10-bit as well as a programmable
analog output that is directly proportional to the angle of a
magnet, rotating over the chip.
The analog output can be configured in many ways, including
user programmable angular range, adjustable output voltage
range, voltage or current output, etc...
An internal voltage regulator allows operation of the AS5043
from 3.3V or 5.0V supplies.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS5043, Programmable 360°
Magnetic Angle Encoder with Absolute SSI and Analog Outputs
are listed below:
Figure 1:
Added Value of Using AS5043
Benefits
•
Highest reliability and durability
•
Simple programming
•
Multiple interfaces
•
Ideal for robotic and motor applications
•
Failure diagnostics
•
Easy setup
•
Small form factor
•
Robust environmental tolerance
Features
•
Contactless high resolution rotational position
encoding over a full turn of 360 degrees
•
Simple user-programmable zero position
•
Serial communication interface (SSI)
•
Programmable 10-bit analog output
•
Input mode for optimizing noise vs. speed
•
Failure detection mode for magnet placement
monitoring and loss of power supply
•
Serial read-out of multiple interconnected AS5043
devices using Daisy Chain mode
•
SSOP 16 (5.3mm x 6.2mm)
•
Wide temperature range: -40°C to 125°C
ams Datasheet
[v1-83] 2017-Jul-18
Page 1
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AS5043 −
General Description
Applications
AS5043, Programmable 360° Magnetic Angle Encoder with
Absolute SSI and Analog Outputs is ideal for applications with
an angular travel range from a few degrees up to a full turn of
360°, such as:
•
Industrial applications:
• Contactless rotary position sensing
• Robotics
• Valve controls
•
Automotive applications:
• Throttle position sensors
• Gas/brake pedal position sensing
• Headlight position control
•
Front panel rotary switches
•
Replacement of potentiometers
Figure 2:
Typical Arrangement of AS5043 and Magnet
Page 2
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ams Datasheet
[v1-83] 2017-Jul-18
AS5043 −
General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 3:
AS5043 Block Diagram
MagRNGn
Mode
Sin
DSP
Hall Array
&
Frontend
Amplifier
Cos
DO
Absolute
Interface
(SSI)
CSn
CLK
OTP
Register
10
DACref
FB
-
Programming
Parameters
Vout
10bit
DAC
+
DACout
Prog_DI
ams Datasheet
[v1-83] 2017-Jul-18
Page 3
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AS5043 −
Pin Assignment
Pin Assignment
Figure 4:
AS5043 Pin Configuration SSOP16
MagRngn
Mode
CSn
CLK
NC
DO
VSS
Prog_DI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD5V
VDD3V3
NC
NC
Vout
FB
DACout
DACref
Package = SSOP16 (16 lead Shrink Small Outline Package)
Figure 5:
Pin Description SSOP16
Pin
1
Symbol
MagRngn
Type
DO_OD
Description
Magnet Field
Magnitude RaNGe
warning; active low, indicates
that the magnetic field strength is outside of the recommended
limits.
Mode
input. Select between low noise (low, connect to VSS) and
high speed (high, connect to VDD5V) mode at power up. Internal
pull-down resistor.
Chip Select,
active low; Schmitt-Trigger input, internal pull-up
resistor (~50kΩ)
Clock
Input of Synchronous Serial Interface; Schmitt-Trigger input
Must be left unconnected
Data Output
of Synchronous Serial Interface
Negative Supply Voltage (GND)
OTP
Programming
Input and Data Input for Daisy Chain mode.
Internal pull-down resistor (~74kΩ).
Should be connected to VSS if programming is not used
DAC Reference
voltage input for external reference
DAC output
(unbuffered, Ri ~8kΩ)
Feedback,
OPAMP inverting input
2
Mode
DI_PD, ST
3
4
5
6
7
8
9
10
11
CSn
CLK
NC
DO
VSS
Prog_DI
DACref
DACout
FB
DI_PU, ST
DI,ST
-
DO_T
S
DI_PD
AI
AO
AI
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ams Datasheet
[v1-83] 2017-Jul-18
AS5043 −
Pin Assignment
Pin
12
13
14
15
16
Symbol
Vout
NC
NC
VDD3V3
VDD5V
Type
AO
-
-
S
S
Description
OPAMP
output
Must be left unconnected
Must be left unconnected
3V-Regulator Output for internal core, regulated from
VDD5V.Connect to VDD5V for 3V supply voltage. Do not load
externally.
Positive Supply Voltage, 3.0 to 5.5 V
Abbreviations for Pin Types in
Figure 5:
DO_OD
DI_PD
DI_PU
S
DO_T
ST
AI
AO
D1
: Digital output open drain
: Digital input pull-down
: Digital input pull-up
: Supply pin
: Digital output /tri-state
: Schmitt-Trigger input
: Analog input
: Analog output
: Digital input
Pin Description
Pins 7, 15
and
16
are supply pins, pins
5, 13
and
14
are for
internal use and must be left open.
Pin 1
is the magnetic field strength indicator,
MagRNGn.
It is
an open-drain output that is pulled to VSS when the magnetic
field is out of the recommended range (45mT to 75mT). The chip
will still continue to operate, but with reduced performance,
when the magnetic field is out of range. When this pin is low,
the analog output at pins #10 and #12 will be 0V to indicate the
out-of-range condition.
Pin 2 MODE
allows switching between filtered (slow) and
unfiltered (fast mode). This pin must be tied to VSS or VDD5V,
and must not be switched after power up.
Pin 3
Chip Select (CSn; active low) selects a device for serial
data transmission over the SSI interface. A “logic high” at CSn
forces output DO to digital tri-state.
Pin 4 CLK
is the clock input for serial data transmission over the
SSI interface.
ams Datasheet
[v1-83] 2017-Jul-18
Page 5
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