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

Technical Documents

Type Description Language
Datasheet Document version 1-04 English
Application Note HW design guide English
Application Note Compilation of source files English

Other Information

Type Description Language
Block Diagram AS3935 Block Diagram English
Factsheet Sense the Storm English

Related Products

Ownership of this product has moved to Sciosense

Please be informed that this product is now owned by Sciosense B.V., a joint venture of ams AG and Wise Road Capital, effective January 13th, 2020.

ScioSense Environmental Sensors