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AS3685A Datasheet(PDF) 15 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. AS3685A
Description  Ultra Small High Efficiency 1000mA Charge Pump
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Manufacturer  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Direct Link  http://www.taosinc.com
Logo TAOS - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

AS3685A Datasheet(HTML) 15 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
14 - 24
The low time of the pulses on EN1 for setting the current should be kept short. Then the (generated) signal on
pin EN2 will stay at a high level during this time ensuring correct operation. RSINGLE should be chosen to fit to the
actual driving waveform on EN1.
7.2.2.2 AS3685B Two Wire Interface with Strobe Input
Using the following application schematic, the AS3685B current and mode can be set accurately and the camera
can directly control the exact strobe time:
Figure 20 – AS3685B Two Wire Interface with strobe input
An example driving waveform can be (this uses method B as shown above in section ‘AS3685B Current
Settings’):
Figure 21 – AS3685B Example Two Wire Interface driving waveform
EN2
EN1
off
STROBE
off
GPIO output driving EN2 directly is
tristated and 'STROBE'
defines input EN2
GPIO output driving EN2
directly defines input EN2
Set current with
number of pulses
Enable/Disable current directly by the
camera module using the 'STROBE' input
Flash/Strobe/Indicatior function
dependent on number of previous pulses
ISET
VBAT
EN1
EN2
Vbat
EN1
EN2
Two GPIO Pins to set
current and mode
STROBE
Optional
Strobe Input
AS3685B
RSTROBE


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