MUNICH, Germany — In motor management applications, piezo knock sensors offer many advantages over other approaches. Austriamicrosystems' (AMS) AS1716 interface device aims at facilitating the usage of these sensors.

Piezo sensors do not require external power supply; they are compact and offer excellent linearity. For this reasons, this type of sensor has been established motor management systems as state-of-the-art approach, explains AMS marketing director Bruce Ulrich.

In order to facilitate interfacing piezo sensors, the company has developed the AS1716. The device offers differential inputs, a first order low pass filter to eliminate the RF noise components, differential to single-ended conversion, programmable gain storage and a two pole low pass multiple feedback filter. It is an analog front end particularly designed for unbiased capacitive sensors, interfacing with sample-and-hold input stages and analog-to-digital converters.

The AS1716 has been EMC characterized by IEC 61967-4 and IEC 62132-4. In addition, it is qualified for automotive use according to AECQ100 and PPAP level 3.

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