AS3685A/AS3685B
Datasheet
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. R SINGLE 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
Vbat
VBAT
AS3685B
Two GPIO Pins to set
current and mode
EN1
EN2
STROBE
EN1
EN2
ISET
R STROBE
Optional
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
Enable/Disable current directly by the
camera module using the 'STROBE' input
EN1
EN2
STROBE
off
Set current with
number of pulses
Flash/Strobe/Indicatior function
dependent on number of previous pulses
off
GPIO output driving EN2 directly is
tristated and 'STROBE'
defines input EN2
GPIO output driving EN2
directly defines input EN2
www.austriamicrosystems.com/ AS3685
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