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AS3685A Datasheet(PDF) 13 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. AS3685A
Description  Ultra Small High Efficiency 1000mA Charge Pump
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Maker  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Homepage  http://www.taosinc.com
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AS3685A Datasheet(HTML) 13 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
12 - 24
7.2.2 AS3685B Current Setting
The current through the LED (ILED) can be set in several steps using the following waveforms:
Figure 16 – AS3685B Current Setting Method A
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
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 tPULSEWIDTH.
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
Mode
ILED
(for RISET = 14.2kΩ)
ILED
(for RISET = 10kΩ)
ILED/IISET
EN1=EN2=0
Off
0mA
0%
0
(Off)
0
1
Indicator
4.7mA average
(=150mA with
1/32 duty cycle
1) )
6.7mA
(=214mA with
1/32 duty cycle
1))
52.2
(=ITORCH2ISET/32)
2
41mA
60mA
448
3
85mA
120mA
929
4
129mA
180mA
1410
5
Torch
173mA
250mA
1891
6
Flash
217mA
310mA
2371
EN2
EN1
Set current with
number of pulses
off
off
Flash/Strobe/Indicatior function
dependent on number of pulses
ILED
t
typ. 64µs
Current can be increased
if required
Define
Method A
min.
tPULSEWIDTH
EN2
EN1
Set current with
number of pulses
off
off
Flash/Strobe/Indicatior function
dependent on number of pulses
ILED
t
typ. 64µs
Current can be
increased if required
no time limit
Define
Method B
min tPULSEWIDTH


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