AS3935 datasheet(2/28 Pages) AMSCO

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AS3935

Franklin Lightning Sensor IC

www.austriamicrosystems.com

Revision 1.2

1 - 27

Datasheet

1 General Description

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

four different addresses. Two clocks are internally generated by two

different RC-Oscillators: TRCO and SRCO. An automatic procedure

can increase the precision of those oscillators. The AS3935 can be

either supplied by an internal voltage regulator or directly by VDD.

2 Key Features



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



Package: 16LD MLPQ (4x4mm)

3 Applications

AS3935 is ideal for Weather Stations, Clocks, Sports Equipment,

Portables, Pool Safety, Uninterruptible Power Supply (UPS), Global

Positioning System (GPS), Cellular phones, Watches, and Golf

Equipment.

Figure 1. AS3935 Block Diagram

POR

I2C

SPI

Bias

Block

Noise Floor

Level

Generation

Noise Floor

Evaluation

Signal Validation

Watchdog

Statistical Distance Estimation

LC-Oscillator

Calibration

TRCO

SRCO

I2C_ADD

VDD VREG

ACG

IRQ

GND

EN_VREG

I2CD/

MOSI

MISO

I2CL/

SCL

Lightning Algorithm

Energy Calculation

ADD0 ADD1

SINT

INP

INN

AFE

TEST

Clock Generators

AS3935

Voltage

Regulator

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