General Description

The AS3931 is an ultra low power, three channel LF ASK receiver designed to operate in various applications such as LF identifications systems and LF tag receivers. AS3931 detects a low frequency ASK-modulated signal by looking for a digital wakeup pattern and generates a WAKE signal after successful pattern detection. The device incorporates an intelligent pattern detection algorithm that provides reliable operation in presence of strong interference. An RSSI signal can be generated at the RSSI pin for each receiver channel.

Key Features

■ Programmable Serial Data Interface

■ Flexible carrier frequencies

■ Three axis wakeup pattern detection

■ Three axis LF field strength measurement

■ Antenna rotation for easy calibration

■ High sensitivity and high dynamic range

■ Wide operating frequency range

■ Reliable, interference resistant wakeup decoding

■ Highly protected differential inputs

■ Ultra low power consumption

■ Automotive qualified

■ 16-pin TSSOP package

Applications

The device is ideal for LF identification systems, LF tag receivers, three dimensional LF field strength measurement systems, and Ultra low power wake up systems.