AS3643
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n
Operating Mode and Currents
The output currents and operating mode are selected according to the following table:
Table 5. Operating Mode and current settings
AS3643 configuration
operating mode and currents
setting out_on
(see
page
24)
mode_
(see
page
24)
Condition
Mode
LED_OUT1/2
output current
Always write same
content to register Cur-
rent Set1 ( led_current )
and Current Set2
if previous operating
assist light or flash mode all registers are reset to
SCL
low
for
t TIME
1
OUT
X
X
X
X
mode was indicator,
shutdown
their default values
0
X
X
10, 01
or 11
0
X
0
X
X
ext_torch_on (see page
22) not 10
ext_torch_on =10
standby
0
by the 7LSB bits of
low current pwm mode
by the 7LSB bits (6...0)
1
X
X
X
X
X
00
01
10
X
1
1
ext_torch_on =10
external torch mode
indicator mode or
assist light mode
3
LED current is defined
2
led_current and
led_current2
LED current is defined
by the 6LSB bits (bits
5...0) of led_current and
led_current2 pwm
modulated with
31.25kHz defined by
register inct_pwm (1/
16...4/16)
LED current is defined
2
of led_current and
led_current2
X
X
strobe_on (see page 25)
=0
flash mode;
X
X
0->1
1
11
1
strobe_on = 1 and
strobe_type (see page
25) = 0
strobe_on = 1 and
strobe_type = 1
flash duration defined by
flash_timeout (see page
24)
flash mode;
flash duration defined by
STROBE input; timeout
defined by flash_timeout
LED current is defined
by led_current and
led_current2 - the
current can be reduced
during flash, see Flash
Current Reductions
below
1. SCL low for t TIMEOUT and operating mode is indicator, assist or flash mode then shutdown mode is entered.
2. The MSB bit of this register not used to protect the LED; therefore the maximum assist / torch light current = half
the maximum flash current
3. The low current mode is a general purpose PWM mode to drive less current through the LED in average, but
keep the actual pulsed current in a range where the light output from the LED is still specified. As only the 6
LSBs of led_current are used the maximum current is limited to 1/4 of the maximum flash current.
www.austriamicrosystems.com/AS3643
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