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ams unveils AS5132 rotary position sensor

12 Jun 2012

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ams has launched the AS5132, a magnetic rotary position sensor IC, which provides accurate angular measurements even at very high rotation speeds. As a system-on-chip, it is designed to be well suited for industrial and automotive brushless DC (BLDC) motors, offering designers a compact and easily assembled position sensing solution. It is also designed to be highly resistant to interference from stray magnetic fields.

The new chip aims to improve on previous version of the magnetic encoder by compensating for angle errors attributable to propagation delay, which is visible at high speeds. It achieves error compensation through integrated pre-commutation functions, and does not require external software routines. The configuration can also be changed while the device is operating in response to changing operating conditions such as variations to rotation speed.

The AS5132 contains an advanced signal-processing circuitry, giving it a propagation delay figure of <22µs causing its angle error to be small. The chip's combination of small propagation delay and advanced pre-commutation delivers detailed angle measurement even in motors rotating at speeds up to 80,000rpm. Angle measurements are accurate to within ±3° maximum. This enables BLDC motor manufactures to attain consistently high levels of torque even in high-speed applications over the whole dynamic range.

The AS5132 also includes upgrades that increase sensitivity that allows operation in a magnetic field, simplification of interface, inclusion of an external clock mode and implementation of a 3V interface mode that eliminates the need for a level shifter. It is also suitable for contactless rotary position sensing, rotary switches, AC/DC and BLDC motor position controls in automotive applications as pump BLDC and steering column BLDC motors.

The rotary position sensor is now in volume production, and is available in 1000-piece quantity orders.

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