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AS3935 Franklin Lightning Sensor™ IC

Lightning sensor IC with embedded distance estimation algorithm


  • Detection of both cloud to ground and cloud to cloud lightning activity within a 40km range
  • Intelligent algorithm provides for false disturber rejection
  • Supply voltage range of 2.4-5.5V with power down, listening and active power modes
  • Antenna auto tuning
  • Small MLPW-16 (4mmx4mm) package


  • Provides early warning beyond human senses and gives distance estimation to head of storm
  • Algorithm reduces false indications
  • Selectable power modes make it suitable for low power portable devices
  • Antenna auto tuning provides for optimal receive performance
  • Suitable for portable battery powered applications

Product parameters

Channels [#]
Wake-Up Sensitivity [µVpp]
LF Carrier Freq. Range [kHz]
Data Rate (Manch.) [kbit/s]
Dynamic Range [dB]
RSSI Step [dB]
Package MLPQ-16 (4x4)
Features Distance estimation up to 40km in 14 steps \ Embedded distance estimation algorithm & auto antenna tuning
Supply [V] 2.4 - 5.5
Current Consumption [(PD/Listening/Active) µA] 1 / 60 / 350
Interface SPI or I²C
Temperature Range [°C] -40 to +85

General Description

The Franklin Lightning Sensor™ is the world’s 1st lightning sensing IC that was designed for low power, portable or fixed wire-line applications. Utilizing a sensitive RF receiver and integrated proprietary algorithm, the Franklin Lightning Sensor™ detects the electrical emissions from lightning activity and then provides for an estimation of the distance to the head of the storm from 40km away down to 1km, while rejecting disturbances from man-made signals such as motors and microwave ovens. This advanced warning capability alerts users so that precautions can be taken.

This product suits for the following applications:

  • Watches
  • Key chains
  • Golf carts
  • Portable GPS
  • Bike computers
  • Weather stations
  • Sports equipment
  • Uninterruptible power supply
  • Power line conditioners
  • Smart grid systems
  • Environmental monitoring systems


Title Category Headline Buy
AS3935DemoKit Application Board Demo Kit for AS3935
AS3935ReferenceDesign Application Board Keychain Reference Design for AS3935


Name Type Description Language Application Data Demoboard data English Software Firmware source 1.0.6 English

Technical Documents

Name Type Description Version Language
AS3935_AN000258_1-00.pdf Application Note Demokit setup 1-00 English
AS3935_AN000251_1-00.pdf Application Note Compilation of source files 1-00 English
AS3935_AN000111_2-00.pdf Application Note HW design guide 2-00 English
AS3935_BD000318_1-00.png Block Diagram AS3935 Block Diagram 1-00 English
AS3935_DS000385_1-00.pdf Datasheet Document version 1-04 1-00 English
AS3935_FS000123_3-00.pdf Factsheet Sense the Storm 3-00 English
AS3935_PD000320_1-00.png Other Product Document AS3935DemoKit Image 1-00 English
AS3935_PD000321_1-00.png Other Product Document AS3935ReferenceDesign Image 1-00 English
AS3935_UG000280_1-00.pdf User Guide Standard board DK 1-00 English

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