AS3935 − General Description Block Diagram The functional blocks of this device are shown below: Figure 2: AS3935 Block Diagram I2CL/ I2CD/ CS SCL MISO MOSI SINT ADD0 ADD1 VDD VREG EN_VREG Voltage SPI I2C I2C_ADD Regulator ACG Register Noise Floor Noise Floor Level POR Evaluation Measurement INP TEST AFE INN LC-Oscil ator Watchdog Signal Validation IRQ Calibration AS3935 Energy Calculation TRCO SRCO Bias Statistical Distance Estimation Block Clock GeneratorsLightning Algorithm GND ams DatasheetPage 3 [v1-04] 2016-Jan-13 Document Feedback Document Outline ScioSense_Cover_page AS3935 Data Sheet General Description Key Benefits & Features Applications Block Diagram Pin Assignments Absolute Maximum Ratings Electrical Characteristics Operating Conditions DC/AC Characteristics for Digital Inputs and Outputs Detailed System and Block Specification Typical Operating Characteristics Detailed Description Circuit Operating Modes Power-Down Mode Listening Mode Signal Verification System and Block Specification Register Table Register Table Description and Default Value Serial Peripheral Interface (SPI) SPI Command Structure Writing of Register Data Reading of Data from Addressable Registers (READ Mode) Send Direct Command Byte I²C Guideline for Pull Up Resistors on I2CL and I2CD I²C Byte Write I²C Register Read Direct Command Voltage Regulator Analog Front-End (AFE) and Watchdog Noise Floor Level Measurement and Evaluation Lightning Algorithm Signal Validation Energy Calculation Statistical Distance Estimation Interrupt Management Antenna Tuning Clock Generation Noise Sources to Be Avoided Package Drawings & Markings Ordering & Contact Information RoHS Compliant & ams Green Statement Copyrights & Disclaimer Document Status Revision Information Content Guide
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