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AS3685C
Datasheet
The control waveform is shown in the next figure:
Figure 14 – Timing Diagram of the AS3685 using active Low strobe function
If the strobe function is not used at all, the interface can be addressed like a normal slave (only writing access).
The strobe function does not violate the two wire interface specification.
Data1 setups the flash current from 0mA to 1000mA, Data2 can be used to set the preview current and Data3
will set the operating mode, can lock 1:2 charge pump mode and set or disable the flash mode timeout time.
Table 7 – Current and Mode Setting for the AS3685
Register
Data1<7:0>
Data2<6:0>
Data2<7>
Data3<2:0>
Purpose
Current Setting Flash
Current Setting Torch (Preview)
not used – leave at 0
Mode setting
Comments
Flash Mode current setting, Flash Timeout timer used if the
mode setting uses this current
0mA to 1000mA (for R ISET =10k ? )
0mA to 700mA (for R ISET =14.2k ? )
Torch (=Preview or Assist) Mode current setting, no timeout
timer used for this current setting
0mA to 500mA (for R ISET =10k ? )
0mA to 350mA
(for R ISET =14.2k ? )
not used
000 … Off (Power down; Charge Pump in 1:1 mode)
001 … Indicator Mode
Data2<7> = 0: ILED = 0.5mA
Data2<7> = 1: ILED = 1.0mA
010 … Torch (=Preview) Mode (Data2 sets current)
011 … Flash Mode (Data1 sets current)
100 … Preview / Flash Mode, STROBE active high
STROBE=H: Flash mode (Data1 sets current)
STROBE=L: Preview mode (Data2 sets current)
101 … Preview / Flash Mode, STROBE active low
STROBE=L: Flash mode (Data1 sets current)
STROBE=H: Preview mode (Data2 sets current)
110 … Force Charge Pump into 1:1.5 mode; no current is
flowing through the current sink (AS3685 can be
used as voltage generator for e.g. backlight LEDs
with additional external current source(s))
111 … Force Charge Pump into 1:2 mode; no current is
flowing through the current sink (AS3685 can be
used as voltage generator for e.g. backlight LEDs
with additional external current source(s))
www.austriamicrosystems.com/AS3685
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