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AS3685A Datasheet(PDF) 10 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) 10 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
9 - 24
7.1.2 Soft Start
The soft start mechanism reduces the inrush current. Battery current is smoothed when switching the
charge pump on and also at each switching condition. This precaution reduces electromagnetic radiation
significantly.
7.2 Current Source (Sink)
The AS3685 operates in three different modes:
Indicator Mode: A small (average) current is used to obtain an indication function with the flash LED (e.g.
indication for camera operation)
Torch Mode: A moderate current of e.g. 150mA allows the use of the flash LED as a torch or video light
Flash Mode: A high current of e.g. 700mA (up to 1000mA) is set for a high brightness flash. Only in this
mode, the flash timeout timer limits the total flash time.
Pulsed Indicator Mode (only AS3685A): The control device sends a short sequence to the AS3685A and the
AS3685A enables the flash LED for a defined fixed duration (torch current setting). This duration is
controlled by the AS3685A and the control device does not need to start an internal timer function.
The current through the LED and the operating mode is controlled by the two digital pins EN1 and EN2. There
are two versions of the AS3685 available: AS3685A and AS3685B. The only difference between these versions
is the digital interface as shown below:
7.2.1 AS3685A Current Setting
For the AS3685A, the operating mode and the current through the LED is defined by the following table:
Table
7 – AS3685A Current Settings
ILED
for RISET =
EN1
EN2
Mode
14.2kΩ
10kΩ
Percent of
Full Scale
ILED/IISET
0
0
Off
0mA
0mA
0%
0
(Off)
1
0
Indicator
4.7mA average
(=150mA with
1/32 duty cycle
1))
6.7mA average
(=214mA with
1/32 duty cycle
1))
0.67%
(=21.4% /
32)
52.2
(=ITORCH2ISET/32)
0
1
Torch
150mA
214mA
21.4%
1639
(=ITORCH2ISET)
1
1
Flash
700mA
1000mA
100%
7650
(=IFLASH2ISET)
Notes:
1) The on-time for indicator mode is 1μs, off time 31μs (32μs = 32.25kHz)
Where IISET is:
I
ISET
V
ISET
R
ISET
1.3 V
R
ISET


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