This part is a kind of semiconductor called AS3931.

Function of this product has 3D Low Power Wake-up Receiver.

Manufacturers : austriamicrosystems AG

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3D Low Power Wake-up Receiver AS3931 1. General Description AS3931 is an ultra low power, three channel LF ASK receiver designed to operate in various applications such as LF identification systems and LF tag receivers. AS3931 is able to detect a low frequency ASKmodulated signal by looking for a digital wake-up pattern and generates a WAKE signal after successful pattern detection. The device incorporates an intelligent pattern detection algorithm that provides reliable operation even in presence of strong interferences. RSSI signals can be generated at the RSSI pin for each receiver channel. PRODUCT BRIEF 4. Additional Features Antenna rotation switch three independent LF receiver chains Wake-up output combining the three receiver chains Low power 32.768 kHz cryst [ ... ]

AS3931 PDF Datasheet Download