AS3645 austriamicrosystems, AS3645 Datasheet - Page 2

• Manufacturer Part Number: AS3645
• Description: 1000/720ma Ultra Small High Efficient Single/dual Led Flash Driver With Safety Features
• Manufacturer: austriamicrosystems

AS3645
Datasheet - P i n o u t
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View)
Pin Description
Table 1. Pin Description for AS3645
1. Application Note: The pin STROBE is usually connected to the camera processor.
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Pin Number

C1
C2
C3
D1
D2
D3
A1
A2
A3
B1
B2
B3

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LED_OUT
Pin Name
IND_OUT
SDA/EN2
STROBE
SCL/EN1
TORCH
I2C/EN
PGND
SGND
VOUT
AS3645
VIN
SW
!


Power ground - connect to ground (GND)
Signal ground - connect to ground (GND)
Positive supply voltage input - connect to supply and make a short connection
to input capacitor C
DCDC converter switching node - make a short connection to the coil L
Torch control digital input with pulldown - enables torch function
Indicator LED current source output
DCDC converter output capacitor - make a short connection to C
I
parallel interface mode: Open drain output to identify single/dual flash LED
Control pin for the operating mode of the AS3645:
Flash LED current source output
serial data input/output for I
EN2 input with pulldown for parallel interface mode
serial clock input in I
EN1 input with pulldown in parallel interface mode
2
C mode: Digital input with pulldown to control strobe time for flash function



!
1. set to high (e.g. VIN) for I
2. set to low (GND) for parallel interface mode with fixed output currents
3. connect a current set resistor to GND (R
mode with adjustable output currents
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Revision 1.6
VIN
2
C mode
# 
and to coil L
2

C mode (needs external pullup resistor);
Description
2
C mode
DCDC
  
 
!




ISET
 

 
!


) for parallel interface


  

 
 
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VOUT
DCDC
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