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AS3930 Datasheet(PDF) 10 Page - ams AG |
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AS3930 Datasheet(HTML) 10 Page - ams AG |
10 / 32 page www.ams.com/LF-Receiver/AS3930 Revision 1.5 10 - 32 AS3930 Datasheet - Detailed Descr i p ti on 8 Detailed Description The AS3930 is a one-dimensional low power low-frequency wake-up receiver. The AS3930 is capable of detecting 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, then 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, then 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 AS3930 is made up of a single receiving channel, 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 SDI. The real time clock can be based on a crystal oscillator or on an internal RC. If the internal RC oscillator is used, a calibration procedure can be performed to improve its accuracy. Figure 10. Block Diagram of the LF Wake-up Receiver AS3930 LF1P LFN GND XIN XOUT DAT CS SDO SDI SCL IRQ VCC RSSI Wakeup AS3930, 1-D LF Wakeup Receiver SDI Main Logic Envelope Detector / Data Slicer Correlator Channel Amplifier1 I/V Bias Xtal RTC RC RTC |
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