AS5161
12-Bit Magnetic Angle Position Sensor
General Description
The AS5161 is a contactless magnetic angle position sensor for
accurate angular measurement over a full turn of 360°. A sub
range can be programmed to achieve the best resolution for
the application. It is a system-on-chip, combining integrated
Hall elements, analog front end, digital signal processing and
best in class automotive protection features 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
0.022° = 16384 positions per revolution. According to this
resolution the adjustment of the application specific
mechanical positions are possible. The angular output data is
available over a 12 bit pulse width modulated (PWM) output.
The AS5161 operates at a supply voltage of 5V and the supply
and output pins are protected against overvoltage up to +20V.
In addition the supply pins are protected against reverse
polarity up to –20V.
Figure 1:
Typical Arrangement of AS5161 and Magnet
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-04] 2015-Dec-07
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AS5161 −
General Description
Key Benefits & Features
The benefits and features of AS5161, 12-Bit Magnetic Angle
Position Sensor are listed below:
Figure 2:
Added Value of Using AS5161
Benefits
•
Great flexibility on angular excursion
Features
•
360º contactless high resolution angular position sensing
•
User programmable start and end point of the
application region
•
Saw tooth mode 1-4 slopes per revolution
•
Clamping levels
•
Transition point
•
Broken GND and VDD detection for all external load cases
•
12-Bit pulse width modulated (PWM) output
•
Wide temperature range: - 40°C to 150°C
•
Simple programming
•
Failure diagnostics
•
High-resolution output signal
•
Ideal for applications in harsh
environments due to contactless
position sensing
Applications
The AS5161 is ideal for automotive applications like:
•
Throttle and valve position sensing
•
Gearbox position sensor
•
Tumble flap
•
Chassis height level
•
Pedal position sensing
•
Contactless potentiometers
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ams Datasheet
[v1-04] 2015-Dec-07
AS5161 −
General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 3:
AS5161 Block Diagram
VDD3V3
VDD
High Voltage/
Reverse Polarity
Protection
AS5161
Sin
Cos
Hall Array
Frontend
Amplifier
ADC
DSP
CORDIC
Controller
12
PWM
OUT
LS Driver
Single Pin
Interface
(UART)
OTP Register
(Programming
Parameters)
GND
ams Datasheet
[v1-04] 2015-Dec-07
Page 3
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AS5161 −
Pin Assignment
Pin Assignment
Figure 4:
SOIC-8 Pin Configuration
VDD
TP1
VDD3V3
GND
1
8
OUT
S
TP3
TP2
AS5161
2
3
4
7
6
5
Figure 5:
Pin Description
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
VDD
TP1
VDD3V3
GND
TP2
TP3
S
OUT
Pin Type
Supply pin
DIO/AIO
multi purpose pin
AIO
Supply pin
DIO/AIO
multi purpose pin
DIO/AIO
multi purpose pin
AIO
DIO/AIO
multi purpose pin
Description
Positive supply pin.
This pin is over voltage protected.
Test pin for fabrication.
Connected to ground in the
application board.
Output of the internal voltage regulator
Ground pin.
Connected to ground in the application.
Test pin for fabrication.
Connected to ground in the
application board.
Test pin for fabrication.
Open in the application.
Test pin for fabrication.
Connected to OUT in the
application board.
Digital PWM output pin.
Over this pin the programming
is possible. Open drain configuration.
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ams Datasheet
[v1-04] 2015-Dec-07
AS5161 −
Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed in
Absolute Maximum Ratings
may
cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any
other conditions beyond those indicated in
Electrical
Characteristics
is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 6:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
V
DD
V
OUT
V
diff
V
DD3V3
I
scr
DC supply voltage at pin
VDD Overvoltage
Output voltage OUT
Voltage difference at pin
VDD and OUT
DC supply voltage at pin
V
DD3V3
Input current
(latchup immunity)
-20
-0.3
-20
20
20
20
V
V
V
No operation
Permanent
-0.3
5
V
-100
100
mA
Norm: AEC-Q100-004
Electrostatic Discharge
ESD
Electrostatic discharge
±2
kV
Norm: AEC-Q100-002
Temperature Ranges and Storage Conditions
T
strg
Storage temperature
-55
150
ºC
Min -67ºF; Max 302ºF
The reflow peak soldering
temperature (body temperature)
specified is in accordance with
IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity
Classification for Non-Hermetic
Solid State Surface Mount
Devices”. The lead finish for
Pb-free leaded packages is matte
tin (100% Sn).
T
Body
Body temperature
260
ºC
RH
NC
MSL
Relative humidity
non-condensing
Moisture Sensitivity Level
5
3
85
%
Represents a maximum floor life
time of 168h
ams Datasheet
[v1-04] 2015-Dec-07
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