Management Unit. AS3682 Datasheet

AS3682 Unit. Datasheet pdf. Equivalent

AS3682 Datasheet
Recommendation AS3682 Datasheet
Part AS3682
Description Camera Lighting Management Unit
Feature AS3682; a u s t ri a m i c r o s y s t e m s AS3682 480mA Camera Lighting Management Unit D a ta S he e t 1.
Manufacture austriamicrosystems
Datasheet
Download AS3682 Datasheet




austriamicrosystems AS3682
austriamicrosystems
AS3682
480mA Camera Lighting Management Unit
Data Sheet
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1 General Description
The AS3682 is a low-noise, high-current charge pump
designed for camera flash LEDs and LCD backlighting
applications. The device is capable of driving up to
480mA of load current.
The AS3682 integrates two independent LED blocks for
driving a single flash LED (CURR11 to CURR13) with up
to 480mA, and general purpose LEDs (CURR2 to
CURR4) with up to 160mA/LED. The general purpose
LEDs are controlled individually and can be used for
backlighting, but also in support of an RGB fun-light or a
movie indicator lamp.
The AS3682 utilizes austriamicrosystems' patent-pend-
ing Intelligent Adaptive Mode Setting (IAMS) to switch
between 1:1, 1:1.5, and 1: 2 modes. In combination with
very-low-drop-out current sinks, the device achieves
high efficiency over the full single-cell Li+ battery voltage
range. The charge pump operates at a fixed frequency
of 1MHz allowing for tiny external components and its
design ensures low EMI and low input-ripple.
The ultra-flexible brightness control scheme allows for
simple adaptation of the device to different system archi-
tectures.
In Normal and Soft Flash Modes the device is controlled
by an I2C interface. In these modes the LED brightness,
flash duration, GPIOs and various charge pump states
are controlled by internal register settings. The GPIO
pins can act as programmable input or output pins and
can also be set to trigger preview and flash light directly
by a camera module.
In Hard Flash Mode, the LED brightness is controlled by
the Enable pins. Those programming pins can be used
as simple enable pins, as PWM input, again offering
ample flexibility for setting the LED brightness.
2 Key Features
! High-Efficiency High-Power Charge Pump
- 1:1, 1:1.5, and 1:2 Intelligent Adaptive Mode Set-
ting (IAMS)
- Efficiency up to 95%
- Soft Start to Reduce Inrush Current
- Low-Noise Constant-Frequency Operation
! Current Sinks
- 400mA Continuous Flash Current (@VIN = 3.2 to
5V, VOUT = 5V)
- 480mA Maximum Pulsed Flash Current
- Programmable: 0 to 160mA, 0.625mA Resolution
! Flexible Brightness Control
- Three 0 to 160mA LEDs
- Individually Addressable via I2C Interface
! Three Operating Modes
- Normal Mode (I2C Interface)
- Soft Flash Mode (I2C Interface)
- Dedicated Control Pins for Hard Flash Modes
! Two General Purpose Inputs/Outputs
- Digital Input, Output, and Tristate
- Programmable Pull-Up and Pull-Down
- Strobe Pin can be used for Camera Flash Control
! LED Disconnect in Shutdown
! Open LED Detection
! Low Stand-By Current (6µA), Interface Fully
Operating
! Low Shut-Down Current (0.2µA)
! Wide Battery Supply Range: 3.0 to 5.5V
! Thermal Protection
! 24-Pin, Small Form-Factor QFN Package
- 4 x 4 x 0.85mm, 0.5mm Pitch
- Enhanced Thermal Characteristics
3 Applications
Lighting management for cameras, mobile telephones,
PDAs, and other 1-cell Li+ or 3-cell NiMH powered
devices.
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Revision 2.21
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austriamicrosystems AS3682
AS3682
Data Sheet
austriamicrosystems
4 Block Diagram
Figure 1. AS3682 Block Diagram
V2_5 22
RBIAS 23
Digital
Supply
Bandgap
and
Current
Reference
ADR 1
VDD_GPIO 12
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CLK/P2 8
DATA/P1 9
Serial
Interface
STROBE/F2 11
GPIO0/P0 10
SFL/F1 16
T1/F0 17
HFL 18
AS3682
Charge Pump
1:1, 1:1.5, 1:2
Digital
Part
Mode
Selector
Current Source
Current Source
2 VBAT1
6 VBAT2
5 C2_P
7 C2_N
3 C1_P
24 C1_N
4 CP_OUT
13 CURR11
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
GND
Exposed Pad
5 Application Diagrams
Figure 2. Normal and Soft Flash Mode Application Diagram
V2_5 22
C3
1µF
RBIAS 23
R1
240kΩ
V2.5 = 41h
GND = 40h
ADR 1
VDD_GPIO 12
R4
1 - 10kΩ
DATA/P1 9
CLK/P2 8
STROBE/F2 11
GPIO0/P0 10
AS3682
2 VBAT1
Battery
6 VBAT2
5 C2_P
C1
2.2µF
7 C2_N
C4
1µF
3 C1_P
24 C1_N
C5
1µF
4 CP_OUT
Flash &
Preview
13 CURR11
Camera C6
Flash 2.2µF
LED
14 CURR12
15 CURR13
Feature
Normal Soft Flash
Mode
Mode
Interface
I2C I2C
Current
Sinks
3
3
Total Current 0 to 450mA 0 to 480mA
Flash LEDs
Addressable Block
Block
Strobe STROBE/F2 STROBE/F2
Trigger or software or software
Strobe
Preview
GPIO0/P0 GPIO0/P0
or software or software
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current
Sinks
Current per
Sink
33
0 to 37.5mA 0 to 160mA
Addressable Individual Individual
SFL Mode:
SFL/F1 = VDD_GPIO
Normal Mode:
SFL/F1 = GND
SFL/F1 16
T1/F0 17
HFL 18
19 CURR2
20 CURR3
21 CURR4
Battery or
CP_OUT
GND
Exposed Pad
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Revision 2.21
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austriamicrosystems AS3682
AS3682
Data Sheet
austriamicrosystems
Figure 3. Hard Flash Mode 1 Application Diagram
C3
1µF
R1
240kΩ
V2_5 22
RBIAS 23
ADR 1
Selectable
VDD_GPIO 12
DATA/P1 9
MSB Preview
CLK/P2 8
AS3682
Preview Control
(Active Low)
GPIO0/P0 10
LSB Preview
STROBE/F2 11
MSB Flash
SFL/F1 16
Strobe Control
(Active Low)
T1/F0 17
LSB Flash
Battery
HFL 18
2 VBAT1
Battery
6 VBAT2
5 C2_P
7 C2_N
C1
2.2µF
C4
1µF
3 C1_P
24 C1_N
C5
1µF
4 CP_OUT
Flash &
Preview
13 CURR11
Camera C6
Flash 2.2µF
LED
14 CURR12
15 CURR13
19 CURR2
Feature
Hard Flash Mode 1
Interface
Dedicated Control Pins
for Strobe (3x) &
Preview (3x)
Current Sinks
6
Total Current
Strobe: 0 to 450mA
Preview: 0 to 400mA
Flash LEDs
Addressable
Block
Strobe Trigger By Strobe Control Pins
Strobe Preview
By Preview Control
Pins
General Purpose
LEDs (CURR2,
CURR3, CURR4)
Current Sinks
Current per
Sink
Addressable
N/A
N/A
N/A
20 CURR3
21 CURR4
GND
Exposed Pad
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Figure 4. Hard Flash Mode 2 Application Diagram
C3
1µF
R1
240kΩ
V2_5 22
RBIAS 23
ADR 1
VDD_GPIO 12
DATA/P1 9
MSB Preview
CLK/P2 8
AS3682
Backlight Control
(Active Low)
Selectable
GPIO0/P0 10
LSB Preview
STROBE/F2 11
MSB Flash
SFL/F1 16
Flash Control
(Active Low)
T1/F0 17
LSB Flash
Battery
HFL 18
2 VBAT1
Battery
6 VBAT2
5 C2_P
7 C2_N
C1
2.2µF
C4
1µF
3 C1_P
24 C1_N
C5
1µF
4 CP_OUT
Flash &
Preview
13 CURR11
Camera
Flash
LED
C6
2.2µF
Feature
Hard Flash Mode 2
Interface
Dedicated Control Pins
for Flash (3x) & General
Purpose (3x)
Current Sinks
3
Total Current
Flash: 0 to 450mA
Flash LEDs Addressable
Block
Strobe Trigger
By Flash Control Pin
Strobe Preview
General Purpose Current Sinks
LEDs (CURR2, Current per Sink
CURR3, CURR4) Addressable
3
0 to 20/37.5mA
Block
14 CURR12
15 CURR13
19 CURR2
20 CURR3
21 CURR4
GND
Exposed Pad
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Revision 2.21
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