austriamicrosystems has introduced an advanced, high-resolution magnetic sensor called the AS5165 for complete and precise angular measurements.
The AS5165 is a contactless, rotary device with a SENT (Single Edge Nibble Transmission) J2716 interface that relays high-resolution sensor data. Standard methods require several analog-to-digital conversions to relay the sensor data, which incurs a lot of expenditure. A CRC (cyclic redundancy check) in the SENT J2716 interface ensures that proper data has been transmitted. Other benefits of using this interface is diagnostic functions can be easily implemented.
The AS5165 is a system-on-chip and incorporates Hall elements, a digital signal processing, an analog front-end and advanced protective features for safe and reliable operation. The AS5165 can be used under extreme automotive conditions.
The AS5165 protects supply and output pins against increased voltage of up to 27V. The sensor also guards the supply pins from reverse polarity to -18V, and detects short circuits or broken wires. A sophisticated architecture makes the sensor resistant to magnetic fields.
In order to determine the angle, users need to use a two-pole magnet that revolves the center of the chip. The magnet can be positioned above or below the integrated circuit. The angle measurement immediately specifies the angular position of the magnet with a resolution of 0.022° = 16384 positions for every revolution.
The AS5165 sensor is resistant to temperature variations, air gap variations and magnet misalignment. It does not require any calibration in view of its innate accuracy. The AS5165 can be used for a number of automotive purposes such as power train sensing and valve and throttle position sensing applications.
The AS5165 is available in TSSOP14 package and requires a power supply of +5 V over a temperature range of -40°C to +150°C. The sensor is AEC-Q100 grade 0 qualified. The AS5165 will be displayed at the Sensor Expo from 7 to 9 June 2010 in Rosemont, Illinois, USA.