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AS3935

Datasheet - Contents

Contents

1 General Description .................................................................................................................................................................. 1

2 Key Features............................................................................................................................................................................. 1

3 Applications............................................................................................................................................................................... 1

4 Pin Assignments ....................................................................................................................................................................... 3

4.1 Pin Descriptions.................................................................................................................................................................................... 3

5 Absolute Maximum Ratings ......................................................................................................................................................

4

6 Electrical Characteristics...........................................................................................................................................................

5

6.1 Operating Conditions............................................................................................................................................................................ 5

6.2 DC/AC Characteristics for Digital Inputs and Outputs .......................................................................................................................... 5

6.3 Detailed System and Block Specification ............................................................................................................................................. 5

7 Typical Operating Characteristics .............................................................................................................................................

7

8 Detailed Description.................................................................................................................................................................. 8

8.1 Circuit ................................................................................................................................................................................................. 11

8.2 Operating Modes................................................................................................................................................................................ 11

8.3 System and Block Specification ......................................................................................................................................................... 11

8.3.1 Register Table ........................................................................................................................................................................... 11

8.3.2 Register Table Description and Default Value........................................................................................................................... 12

8.4 Serial Peripheral Interface (SPI)......................................................................................................................................................... 14

8.4.1 SPI Command Structure............................................................................................................................................................ 14

8.4.2 Writing of Register Data............................................................................................................................................................. 15

8.4.3 Reading of Data from Addressable Registers (READ Mode) .................................................................................................... 15

8.4.4 Send Direct Command Byte ...................................................................................................................................................... 16

8.5 I²C....................................................................................................................................................................................................... 16

8.5.1 I²C Byte Write ............................................................................................................................................................................ 17

8.5.2 I²C Register Read ...................................................................................................................................................................... 18

8.5.3 Direct Command........................................................................................................................................................................ 18

8.6 Voltage Regulator............................................................................................................................................................................... 18

8.7 Analog Front-end (AFE) and Watchdog ............................................................................................................................................. 19

8.8 Noise Floor Generator and Evaluation ............................................................................................................................................... 20

8.9 Lightning Algorithm ............................................................................................................................................................................ 20

8.9.1 Signal Validation ........................................................................................................................................................................ 20

8.9.2 Energy Calculation..................................................................................................................................................................... 21

8.9.3 Statistical Distance Estimation................................................................................................................................................... 21

8.9.4 Interrupt Management ............................................................................................................................................................... 22

8.10 Antenna Tuning ................................................................................................................................................................................ 23

8.11 Clock Generation .............................................................................................................................................................................. 23

9 Package Drawings and Markings ...........................................................................................................................................

24

10 Ordering Information.............................................................................................................................................................

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