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AS3685A/AS3685B
Datasheet
7.2.2 AS3685B Current Setting
The current through the LED (I LED ) can be set in several steps using the following waveforms:
Figure 16 – AS3685B Current Setting Method A
Define
Method A
Set current with
number of pulses
EN1
EN2
Current can be increased
if required
min.
I LED
t PULSEWIDTH
typ. 64μs
Flash/Strobe/Indicatior function
dependent on number of pulses
off
off
t
For method A, the current is started after a certain time after the first rising edge of EN1. The AS3685B chooses
method A, if EN1 is high at the first rising edge of EN2.
Figure 17 – AS3685B Current Setting Method B
Define
Method B
Set current with
number of pulses
EN1
EN2
Current can be
increased if required
I LED
no time limit
typ. 64μs
Flash/Strobe/Indicatior function
dependent on number of pulses
off
min t PULSEWIDTH
off
t
For method B, the current is started after the second rising edge of EN2. The AS3685B chooses method B, if
EN1 is low at the first rising edge of EN2.
Any high or low level duration for EN1 or EN2 should not be shorter than t PULSEWIDTH .
The actual number of pulses on the pin EN1 (applies for methods A and B) define the mode and the current
settings for the AS3685B:
Table 9 – AS3685B Current Settings
H-L-H Pulses on EN1
EN1=EN2=0
0
1
2
3
4
5
6
Mode
Off
Indicator
Torch
Flash
I LED
(for R ISET = 14.2k ? )
0mA
4.7mA average
(=150mA with
1/32 duty cycle 1) )
41mA
85mA
129mA
173mA
217mA
I LED
(for R ISET = 10k ? )
0%
6.7mA
(=214mA with
1/32 duty cycle 1) )
60mA
120mA
180mA
250mA
310mA
I LED /I ISET
0
(Off)
52.2
(=I TORCH2ISET /32)
448
929
1410
1891
2371
www.austriamicrosystems.com/ AS3685
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