AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS3932 is a three-dimensional low power low-frequency wake-up receiver. The AS3932 is capable to detect the presence of an inductive
coupled carrier and extract the envelope of the On-Off-Keying (OOK) modulated carrier. In case the carrier is Manchester coded the clock is
recovered from the transmitted signal and the data can be correlated with a programmed pattern. If the detected pattern corresponds to the
stored one a wake-up signal (IRQ) is risen up. The pattern correlation can be bypassed in which case the wake-up detection is based only on the
frequency detection.
The AS3932 is made up by three independent receiving channels, one envelop detector, one data correlator, 8 programmable registers with the
main logic and a real time clock.
The digital logic can be accessed by an SPI. The real time clock can be based on a crystal oscillator or on an internal RC one. If the internal RC
oscillator is used, a calibration procedure can be performed to improve its accuracy.
Figure 10. Block Diagram of LF Wake-up Receiver AS3932
AS3932
Data
Wake-up
IRQ
SCL
LF1P
Channel
Amplifier 1
RSSI
Main Logic
SPI
SDI
Freq. OK
SDO
LF2P
Data
Channel
Amplifier 2
RSSI
Channel
Selector
Envelope Detector /
Data Slicer
Correlator
CS
Freq. OK
Data
DAT
LF3P
Channel
Amplifier 3
RSSI
Freq. OK
I/V
Bias
Xtal RTC
RC RTC
LFN
www.ams.com/LF-Receiver/AS3932
VCC
GND
Revision 1.7
Xin
Xout
11 - 34
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