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 ASK-
modulated 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 crystal oscillator circuit
Serial programming interface
Voltage regulator with 2.4 V output, on/off
switchable
2. Key Features
-
-
-
-
-
-
-
-
3D wake-up pattern detection
3D LF field strength measurement
Antenna rotation for easy calibration
High sensitivity and high dynamic range
Wide operating frequency range
Reliable, interference resistant wake-up decoding
Highly protected differential inputs
Ultra low power consumption
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 sequence in the received
data signal and generates a wake-up signal
-
Sophisticated power management logic that
powers down the correlator if no data is
received
3. Main characteristics
-
-
-
-
-
-
Wake-up sensitivity:
350 µVpp
LF carrier frequency range:
19 – 150 kHz
Data rate: 2.731 kb/s
Current consumption in standby mode:
6.6 µA
Dynamic range:
60 dB
RSSI step: (∆V
RSSI
@ 1 mVpp input amp.):
290 mV
5. Applications
-
-
-
-
LF identification systems
LF tag receivers
Three-dimensional LF field strength
measurement systems
Ultra low power wake-up systems
Revision No. 1.1, Date: 09-2005
Page 1 of 2
Copyright © 2005
austriamicrosystems.
Trademarks registered ®. All rights reserved. The material herein may not be reproduced, adapted,
merged, translated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge,
austriamicrosystems asserts that the information contained in this publication is accurate and correct.
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
