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AS3935 Franklin Lightning Sensor™

Lightning sensor IC with embedded algorithm

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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 the necessary precautions can be taken to protect individuals and equipment from hazardous and deadly lightning strikes.


Key Features

  • 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 (4x4mm) package

Key Benefits

  • Provides early warning beyond human senses & gives distance estimation to head of storm
  • Algorithm minimizes false indications
  • Selectable power modes make it suitable for low power portable devices
  • Antenna Auto tuning provides for optimal receive performance
  • Suitable for very small form factor applications

Product Facts

Channels [#]
Wake-up sensitivity [µVpp]
LF carrier freq. range [kHz]
Data rate (manch.) [kb/s]
Dynamic range [dB]
RSSI step [dB]
Package MLPQ-16 (4x4)
Features Distance estimation up to 40 km in 14 steps,
embedded Disturber rejection 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

Additional Information

  • Watches
  • Key chains
  • Golf Carts
  • Pool Safety
  • Portable GPS
  • Bike Computers
  • Weather Stations
  • Sports Equipment
  • Uninterruptible Power Supply
  • Power line conditioners
  • Hi-Fi Electronics
  • Smart Grid systems
  • Environmental monitoring Systems