AS3931 Datasheet, PDF (1/2 Pages) ams AG – 3D Low Power Wake-up Receiver

3D Low Power Wake-up Receiver
AS3931
PRODUCT BRIEF
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.
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
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
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: (∆VRSSI @ 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
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