AS3935-BQFT ams, AS3935-BQFT Datasheet - Page 21

• Manufacturer Part Number: AS3935-BQFT
• Description: Interface - Specialized
• Manufacturer: ams

Specifications of AS3935-BQFT

• Rohs: yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Supply Current: 100 mA
• Maximum Power Dissipation: 0.1 W
• Mounting Style: SMD/SMT
• Package / Case: MLPQ-16
• Supply Voltage - Max: 5.5 V

AS3935
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 21. Detection Efficiencies vs. Distance for Different Setting of SREJ, if WDTH=0001
At the end of the signal verification, the AS3935 automatically returns to listening mode.
8.9.2 Energy Calculation
If the received signal is classified as lightning, the energy is calculated. The result of the energy calculation is then stored in the registers
REG0x06[4:0], REG0x05[7:0] and REG0x04[7:0]. This value is just a pure number and has no physical meaning.
8.9.3 Statistical Distance Estimation
The AS3935 generates an assessment of the estimated distance to the head of an approaching storm. This assessment is done based on
statistical calculation. The energy of the single event (lightning) provided by the Energy Calculation block is stored in an internal memory,
together with timing information, in the AS3935. The events stored in the memory are then correlated with a look-up table by the statistical
distance estimation block, which provides a final estimation of the distance to the head of the storm. The algorithm automatically deletes events,
which are older than a certain time. R7=0x01 means that the storm is right overhead, while R7=0x3F is displayed when the storm is out of range.
This algorithm is hardwired and not accessible from outside.
The estimated distance is directly represented in km in the register REG0x07[5:0] (binary encoded). The distance estimation can change also if
no new event triggers the AS3935, as older events can be purged.
Table 17. Distance Estimation
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REG0x07[5:0]
101000
100101
100010
111111
60%
40%
20%
0.0
0
SREJ
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
1011
0111
10
Revision 1.2
Radius [km]
20
30
Distance [km]
Out of range
40
37
34
40
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