AS3931 View Datasheet(PDF) - austriamicrosystems AG

Part Name

Description

Manufacturer

AS3931

3D Low Power Wakeup Receiver

austriamicrosystems AG 

Datasheet

AS3931

3D Low Power Wakeup Receiver

1 General Description

Error tolerant digital pattern correlator that detects a given code

sequences in the received data signal and generates a wakeup

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

2 Key Features lid 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

a RSSI signal can be generated at the RSSI pin for each receiver

channel.

v The product is available in 16-pin TSSOP package.

The AS3931 contains:

ill Antenna rotation switch

Three independent LF receiver chains

t Wakeup output combining the three receiver chains

G s Low power 32.768kHz crystal oscillator circuit

Serial programming interface

A t Voltage regulator with 2.4V output, on/off switchable

s n Each independent LF receiver chain contains:

Input overload protection

e Input attenuator

m t Ultra low power LF amplifier with logarithmic envelope output

a 3 nApplications Robust data detector with adaptive slicing threshold that

o translates the logarithmic envelope into a digital data signal.

signal.

Sophisticated power management logic that powers down the

correlator if no data is received.

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

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.

c Figure 1. Typical Application Diagram

icalCBAT

n Transmitting

TechAntenna

VCC

VCC

LF1N

LF1P

LF2N

LF2P

LF3N

VREG

RSSI

SDA

SCL

CS

WAKE

RP

CREG

RSSI

DATA

CLOCK

CHIP SEL

WAKE

LF3P

XOUT

XTAL

GND

XIN

CA

CB

www.austriamicrosystems.com/AS3931

Revision 6.2

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