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AS3647/47B
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n
Figure 20. Device Shutdown and Wakeup
                                                                              
                                                                         
 
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! !"
          
   
 
  
   
  
AS3647/47B
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 +   & +  
the I C bus. Therefore no additional action is required to leave the shutdown mode and start I C communication.
In shutdown mode once pin SCL goes high for the first time, the internal counter shown in Figure 20 is immediately
reset thus releasing the internal RESET (assuming VIN is above V UVLO ) signal and allows instant communication on
2 2
Purpose of this circuit
The purpose of this circuit is an additional security mechanism.
Assume the user programmed torch or indicator operation (there is no timeout for these operating modes) and the bat-
tery slowly drops below the undervoltage limit of the system. The processor would get an reset by the PMIC and the
LDO operating VDD_I/F is switched off, but the processor might not have been able to switch-off the torch/indicator
operation of the AS3647/47B. Due to the implemented security mechanism the AS3647/47B detects a power off of
VDD_I/F and automatically enters shutdown.
Current consumption in standby/shutdown mode
The AS3647/47B is designed to draw minimum current in standby and shutdown mode. There is a small difference in
current consumption between these two operating modes (typ. 300nA) only due to the internal level shifters (see the
schmitt trigger input buffers connected to SCL and SDA in Figure 20 ) for shifting up the voltage on SCL/SDA (VDD_I/F
e.g. 1.8V) to the supply voltage on VIN (e.g. 3.7V). If the AS3647/47B is driven with digital levels close to 0V/VIN, the
current consumption for standby mode is identical to shutdown mode.
Operating Mode and Currents
The output currents and operating mode are selected according to the following table:
Table 5. Operating Mode and current settings
AS3647/47B configuration
operating mode and currents
setting out_on
(see
page
26)
mode_
(see
page
26)
Condition
Mode
LED_OUT1/2
output current
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
www.austriamicrosystems.com/AS3647
1.5-4
15 - 37
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