AS3930
Data Sheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS3930 is a one-dimensional low power low-frequency wakeup receiver. The AS3930 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 case and the wake-up detection is based only on the
frequency detection.
The AS3930 is made up of a single receiving channel, one envelop detector, one data correlator, one Manchester decoder, 8 programmable
registers with the main logic and a real time clock.
The digital logic can be accessed by an SDI. The real time clock can be based on a crystal oscillator or on an internal RC. In case internal RC is
used to improve its accuracy a calibration can be performed.
8.1 Block Diagram
Figure 10. Block Diagram
AS3930
Wakeup
IRQ
SCL
Main
Logic
SDI
SDI
SDO
RSSI
CS
LF1P
Channel
Amplifier
Envelope Detector /
Data Slicer
Correlator
Manchester
Decoder
DAT
CL_DAT
I/V
Bias
Xtal RTC
RC RTC
LFN
VCC
GND
X
IN
X
OUT
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
