AS5161 datasheet(2/36 Pages) AMSCO

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AS5161

12-Bit Magnetic Angle Position Sensor

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Revision 1.1

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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.

AS5161 数据表(PDF) 2 Page - ams AG

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