AS3931_07 datasheet(2/31 Pages) AMSCO

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AS3931

3D Low Power Wakeup Receiver

www.austriamicrosystems.com/AS3931

Revision 6.2

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Datasheet

1 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.

The product is available in 16-pin TSSOP package.

The AS3931 contains:

Antenna rotation switch

Three independent LF receiver chains

Wakeup output combining the three receiver chains

Low power 32.768kHz crystal oscillator circuit

Serial programming interface

Voltage regulator with 2.4V output, on/off switchable

Each independent LF receiver chain contains:

Input overload protection

Input attenuator

Ultra low power LF amplifier with logarithmic envelope output

Robust data detector with adaptive slicing threshold that

translates the logarithmic envelope into a digital data signal.

Error tolerant digital pattern correlator that detects a given code

sequences in the received data signal and generates a wakeup

signal.

Sophisticated power management logic that powers down the

correlator if no data is received.

2 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

3 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.

Transmitting

Antenna

VCC

CBAT

CREG

RSSI

DATA

CLOCK

CHIP SEL

WAKE

XTAL

VCC

LF1N

LF1P

LF2N

LF2P

LF3N

LF3P

GND

XIN

XOUT

WAKE

SCL

SDA

RSSI

VREG

Figure 1. Typical Application Diagram

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