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PDF AS5161 Data sheet ( Hoja de datos )
| Número de pieza | AS5161 | |
| Descripción | 12-Bit Magnetic Angle Position Sensor | |
| Fabricantes | ams | |
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AS5161
12-Bit Magnetic Angle Position Sensor
1 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
2 Key Features
360º contactless high resolution angular position sensing
User programmable start and end point of the application region
+ linearization.
User programmable clamping levels and programming of the
transition point.
Digital PWM output
- Short circuit monitor
- High driving capability for resistive and capacitive loads
Wide temperature range: - 40°C to + 150°C
Small Pb-free package: SOIC 8.
Broken GND and VDD detection over a wide range of different
load conditions.
Saw tooth mode 1,2,3,4 slopes per revolution
3 Benefits
Unique fully differential patented solution
Best protections for automotive applications
Easy to program
Additional linearization points for output characteristic
Ideal for applications in harsh environments due to contactless
position sensing
Robust system, tolerant to magnet misalignment, air gap
variations, temperature variations and external magnetic fields
High inherent accuracy
Broken GND and VDD detection for all external load cases
4 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 and contactless potentiometers.
www.ams.com
Revision 1.1
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1 page  
AS5161
Datasheet - Absolute Maximum Ratings
6 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 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 on page 6 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Min Max Units
Comments
Electrical Parameters
VDD
DC supply voltage at pin VDD
Overvoltage
-20 20
V No operation
VOUT
Output voltage OUT
-0.3 20
V Permanent
Vdiff Voltage difference at pin VDD and OUT -20
20
V
VDD3V3
DC supply voltage at pin VDD3V3
-0.3
5
V
Iscr
Input current (latchup immunity)
-100 100
mA Norm: AEC-Q100-004
Electrostatic Discharge
ESD Electrostatic discharge
±2 kV Norm: AEC-Q100-002
Temperature Ranges and Storage Conditions
Tstrg
Storage temperature
-55 +150
ºC Min -67ºF; Max +257ºF
TBody
Body temperature
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020 “Moisture/Reflow
260 ºC Sensitivity Classification for Non-Hermetic Solid
State Surface Mount Devices”. The lead finish
for Pb-free leaded packages is matte tin (100%
Sn).
H Humidity non-condensing
MSL Moisture Sensitive Level
5 85
3
%
Represents a maximum floor life time of 168h
www.ams.com
Revision 1.1
5 - 35
5 Page 
AS5161
Datasheet - Detailed Description
8.2.2 Application Specific Angular Range Programming
The application range can be selected by programming T1 with a related T1Y and T2 with a related T2Y into the AS5161. The clamping levels
CLL and CLH can be programmed independent from the T1 and T2 position and both levels can be separately adjusted.
Figure 5. Programming of an Individual Application Range
Figure 5 shows a simple example of the selection of the range. The mechanical starting point T1 and the mechanical end point T2 are defining
the mechanical range. A sub range of the internal Cordic output range is used and mapped to the needed output characteristic. The PWM output
signal has 12 bit, hence the level T1Y and T2Y can be adjusted with this resolution. As a result of this level and the calculated slope the clamping
region low is defined. The break point BP defines the transition between CLL and CLH. In this example the BP is set to 0 degree. The BP is also
the end point of the clamping level high CLH. This range is defined by the level CLH and the calculated slope. Both clamping levels can be set
independently form each other.
8.2.3 Application Specific Programming of the Break Point
The break point BP can be programmed as well with 14 bits. This is important when the default transition point is inside the application range. In
such a case the default transition point must be shifted out of the application range. The parameter BP defines the new position.
Figure 6. Individual Programming of the Break Point BP
www.ams.com
Revision 1.1
11 - 35
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS5161.PDF ] | |
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