AS3935-BQFT ams, AS3935-BQFT Datasheet - Page 22

• 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
Table 17. Distance Estimation
The calculated energy is stored in registers REG0x04[7:0], REG0x05[7:0] and REG0x06[4:0].
8.9.4 Interrupt Management
Whenever events happen, the AS3935 pulls the IRQ high and displays the interrupt in the REG0x03[3:0].
Table 18. Interrupts
The INT_NH is issued if the received noise exceeds the maximum acceptable noise. INT_NH persists until the noise is again back to low.
In case the signal validation block assesses the received signal as disturber, the INT_D is displayed. It is possible to mask the disturber
interrupts INT_D with MASK_DIST (REG0x03[5] =1).
If the MASK_DIST option is enabled, the signal on the pin IRQ never goes high if a disturber is detected.
The interrupt bus IRQ is set back to low whenever the interrupt register is read out.
The AS3935 issues a lightning interrupt (INT_L) if a new event is detected. All new events are stored in the internal memory and build up a
lightning statistic used by the distance estimation algorithm. If the AS3935 issues an interrupt and the Interrupt register is REG0x03[3:0] =000
the distance estimation has changed due to purging of old events in the statistics, based on the lightning distance estimation algorithm.
Whenever an interrupt is issued, the external unit should wait 2ms before reading the Interrupt register.
In addition, it is possible to allow the AS3935 to issue lightning interrupts only if a minimum number of events (lightning) have been detected in
the last 17 minutes. The minimum number of lightning events can be set with register REG0x02[5:4].
Table 19. Minimum Number of Lightning Detection
When this feature is utilized, a minimum number of events must occur to trigger a valid lightning event. This eliminates false triggers by man-
made disturbers that may pass the validation algorithm. It is possible to clear the statistics built up by the lightning distance estimation algorithm
block by just toggling the bit REG0x02[6] (high-low-high).
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Interrupt Name
INT_NH
INT_D
INT_L
Minimum Number of Lightning
REG0x07[5:0]
011000
010100
010001
001100
001010
001000
000110
000101
000001
011011
001110
011111
16
1
5
9
REG0x03[3:0]
0001
0100
1000
Revision 1.2
REG0x02[5]
0
0
1
1
Storm is Overhead
Distance [km]
Noise level too high
Disturber detected
Lightning interrupt
31
27
24
20
17
14
12
10
8
6
5
Table 18
Description
shows the interrupt register.
REG0x02[4]
0
1
0
1
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