AS5046
PROGRAMMABLE 12-bit 360° MAGNETIC ANGLE ENCODER
WITH ABSOLUTE 2-WIRE SERIAL AND ANALOG INTERFACES
PRELIMINARY DATA SHEET
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General Description
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Key Features
360° contactless high resolution angular position encoding
User programmable zero position
12-bit 2-wire serial interface
Versatile analog output
programmable angular range up to 360°
programmable ratiometric output voltage range
High resolution magnet distance indication
256 steps within recommended range (~0.5 to 1.8mm)
256 steps over extended range (~0 to 5mm)
Mode input for optimizing noise vs. speed
Alignment mode for magnet placement guidance
Wide temperature range: - 40°C to + 125°C
Small package: SSOP 16 (5.3mm x 6.2mm)
The AS5046 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 AS5046 provides a digital serial 12-bit as well as a
programmable 10-bit ratiometric analog output that is
directly proportional to the angle of a magnet, rotating
over the chip.
In addition, the serial interface enables a user
configurable arrangement of the Hall array and allows
access to each individual Sensor of the Hall Array.
The AS5046 also provides high resolution information of
the magnetic field strength, respectively the vertical
distance of the magnet, thus adding excellent state-of-
health information of the overall system.
An internal voltage regulator allows operation of the
AS5046 from 3.3V or 5.0V supplies.
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Applications
The AS5046 is ideal for applications that require high
resolution, a minimum of wires between controller and
sensor and where the vertical distance of the magnet is
of importance:
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Remote sensors
Rotate-and-push manual input devices
Joysticks
Applications with extended safety requirements
regarding magnet distance
MagRNGn
Figure 1: Typical arrangement of AS5046 and magnet
Hall Array
&
Frontend
Amplifier
Hall
Sensor
switch
matrix
14-bit
ADC
14-bit
ADC
Sin
Ang
Mag
12
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Mode
CSn
Benefits
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Complete system-on-chip
High reliability due to non-contact sensing
Bi-directional 2-wire interface
Programmable ratiometric analog output
Ideal for application s in harsh environments
Robust system, tolerant to magnet misalignment,
airgap variations, temperature variations and
external magnetic fields
No calibration required
DSP
Cos
AGC
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12
8
Absolute
Interface
(I²C)
8
SDA
SCL
12
OTP
Register
Range
preselect
10
DACref
FB
-
Vout
AS5046
Programming
Parameters
10bit
DAC
+
DACout
Prog_DI
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Figure 2: AS5046 block diagram
Revision 1.1
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