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Franklin Lightning Sensor

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The AS3935 is a programmable fully integrated Lightning Sensor IC that detects the presence and approach of potentially hazardous lightning activity in the vicinity and provides an estimation on the distance to the head of the storm. The embedded lightning algorithm checks the incoming signal pattern to reject the potential man-made disturbers.

The AS3935 can also provide information on the noise level and inform the external unit (e.g. microcontroller) in case of high noise conditions, with the noise floor generator and noise floor evaluation blocks.

The AS3935 can be programmed via a 4-wire standard SPI or an I²C. Also, in case the latter is chosen, it is possible to choose among three different addresses. Two clocks are internally generated by two different RC-Oscillators: TRCO and SRCO. An automatic calibration procedure can increase the precision of those oscillators. The AS3935 can be either supplied by an internal voltage regulator or directly by VDD.

  • Lightning sensor warns of lightning storm activity within a radius of 40km
  • Distance estimation to the head of the storm down to 1km in 14 steps
  • Detects both cloud-to-ground and intra-cloud (cloud-to-cloud) flashes
  • Embedded man-made disturber rejection algorithm
  • Programmable detection levels enable threshold setting for optimal controls
  • SPI and I²C interface is used for control and register reading
  • Antenna Tuning to compensate variations of the external components
  • Supply voltage range 2.4V to 5.5V
  • Power-down, listening, and active mode


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