AS5170
High-Resolution On-Axis Magnetic
Angular Position Sensor
General Description
The AS5170 is a high-resolution angular position sensor for
precise absolute angle measurement. The AS5170 is available
with an analog output interface (AS5170A and AS5170C) or a
digital output interface (AS5170B and AS5170D). The latter can
be programmed as a PWM or a SENT-compliant output
interface.
Based on a Hall sensor technology, this device measures the
orthogonal component of the flux density (Bz) over a full-turn
rotation and compensates for external stray magnetic fields
with a robust architecture based on a 14-bit sensor array and
analog front-end (AFE). A sub-range can be programmed to
achieve the best resolution for the application. To measure the
angle, only a simple two-pole magnet rotating over the center
of the package is required. The magnet may be placed above
or below the device. The absolute angle measurement provides
an instant indication of the magnet’s angular position. The
AS5170 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 AS5170A/B/C/D and a Magnet
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-05] 2017-Nov-08
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AS5170 −
General Description
Key Benefits and Features
The benefits and features of this device are listed below:
Figure 2:
Added Value of Using AS5170
Benefits
•
Resolve small angular excursion with high
accuracy
•
Accurate angle measurement
•
Higher durability and lower system costs (no
shield needed)
•
Enabler for safety critical applications
Features
•
12-bit resolution @90° minimum arc
•
Low output noise, low inherent INL
•
Magnetic stray field immunity
•
Functional safety, diagnostics, dual redundant chip
version
Applications
The AS5170 is ideal for applications like:
•
Rotary button angle sensors
•
Liquid-level measurement systems
•
Contactless potentiometers
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ams Datasheet
[v1-05] 2017-Nov-08
AS5170 −
General Description
Block Diagram
The functional blocks of the AS5170A, AS5170B, AS5170C and
AS5170D are shown below:
Figure 3:
Functional Blocks of the AS5170A and AS5170C
VDD
Register Setting
VDD3V3
LDO
Reverse Polarity Protection
OTP
UART
Hall Sensors
OUT
Analog
Front-End
14-bit A/D
ATAN
(CORDIC)
Digital Filter
12-bit D/A
Linearizator
Driver
AGC
AS5170A
AS5170C
GND
Figure 4:
Functional Blocks of the AS5170B and AS5170D
VDD
Register Setting
VDD3V3
LDO
Reverse Polarity Protection
OTP
UART
PWM
Hall Sensors
OUT
Analog
Front-end
14-bit A/D
ATAN
(CORDIC)
Digital Filter
Linearizator
Driver
SENT
AGC
AS5170B
AS5170D
GND
ams Datasheet
[v1-05] 2017-Nov-08
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AS5170 −
Pin Assignments
Pin Assignments
Figure 5:
AS5170A/B/C/D Pin Assignment (Top View, SOIC8)
VDD
1
8
GND
TP1
TP2
TP3
AS5170x
2
3
7
6
5
VDD3V3
TP4
OUT
4
Figure 6:
AS5170A/B/C/D Pin Description
Pin Number
SOIC-8
1
2
3
4
Pin
Name
VDD
TP1
TP2
TP3
Supply
n.a.
n.a.
n.a.
Pin Type
Description
Positive supply
Test pin
Test pin
Test pin
Output
interface
Test pin
Comments
Connected to ground
Leave open
Connected to ground
AS5170A/C: analog output
AS5170B/D: PWM or SENT output
To be connected to OUT
3.3V on-chip low-dropout (LDO)
output. Requires an external
decoupling capacitor (100nF).
5
OUT
Analog output (AS5170A
and AS5170C)
Digital output (AS5170B
and AS5170D)
n.a.
Supply
Supply
6
7
8
TP4
VDD
3V3
GND
Ground
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ams Datasheet
[v1-05] 2017-Nov-08
AS5170 −
Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under
Electrical
Characteristics
is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 7:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
VDD
VOUT
VDIFF
VREGOUT
I
SCR
DC Supply Voltage at
VDD pin
External DC voltage at
OUT pin
DC voltage difference
between VDD and OUT
DC voltage at the
VDD3V3 pin
Input Current (latch-up
immunity)
-20
-0.3
-20
-0.3
-100
20
20
20
5.0
100
V
mA
Tests done according AEC Q100 004
V
V
Not operational
Permanent
Continuous Power Dissipation (T
AMB
= 70°C)
P
T
Continuous Power
Dissipation
300
mW
Electrostatic Discharge
ESD
HBM
Electrostatic Discharge
HBM
±2
kV
Tests done according AEC Q100 002
ams Datasheet
[v1-05] 2017-Nov-08
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