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PDF AS3685C Data sheet ( Hoja de datos )
| Número de pieza | AS3685C | |
| Descripción | Ultra Small High Efficiency 1000mA Charge Pump | |
| Fabricantes | austriamicrosystems | |
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AS3685C
DDataasthaesetheet
austriamicrosystems
AS3685C
Ultra Small High Efficiency 1000mA Charge Pump for White
LED Flash with Two Wire Serial Interface
1 General Description
The AS3685 is low noise high efficiency capacitive
charge pump with 1:1, 1:1.5 and 1:2 operating
modes in a small 3x3mm DFN10 or a tiny 2x1.5mm
WL-CSP (Wafer Level Chip Scale Package)
package. It can drive one flash led at up to 1000mA
current. It supports flash/torch and indicator mode
for the flash led.
Additionally the AS3685 limits the flash time
automatically to protect the flash LED.
2 Key Features
High Efficiency capactive charge pump with 1:1,
1:1.5 and 1:2 modes
− 1:2 Mode can be disabled by interface
Up to 1000mA Led Current
Automatic Charge Pump Mode switching (Up)
4 Application Diagram
Figure 1 – Application Diagram of AS3685C
LED cathode disconnect in Shutdown
Overtemperature Protection
Automatic Flash Timeout to protect the LED
− Adjustable between off, 100ms…1500ms
Two Wire Interface
− Accurate Control of Currents and Modes
Package
− DFN10 3x3mm (10 pins + exposed pad)
− WL-CSP (Wafer Level Chip Scale Package)
3x4 balls 0.5mm pitch (2x1.5mm)
3 Applications
Flash / Torch for Mobile Phones, Digital
Cameras and PDA
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AS3685C
Datasheet
Table 4 – Current Source (Sink) Characteristics
Symbol Parameter
Min Typ Max Unit
150 200 250 mV
Note
All lower currents
Table 5 –Digital Interface characteristics
Symbol Parameter
VIH High Level Input voltage
VIL Low Level Input voltage
ILEAKAGE
Input pin leakage current
Min Typ Max Unit
Note
1.5 VBAT V
0.0
0.5 V
For Pins SCL and SDA
-10 10 μA
Table 6 – Protection Functions
Symbol Parameter
TOVTEMP Overtemperature protection
TOVTEMPHYST
Overtemperature protection
Hysteresis
tFLASHTIMEOUT
Flash Timeout Time
Min
-20%
Typ
140
5
100…
1500
Max
+20%
Unit
°C
°C
ms
Note
If the junction temperature
exceeds TOVTEMP, the current
sink will be disabled and the
charge pump switched back
into 1:1 mode until the
temperature drops below
TOVTEMP - TOVTEMPHYST
adjustable by register Flash
Timeout Timer
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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>
Purpose
Current Setting Flash
Current Setting Torch (Preview)
Comments
Flash Mode current setting, Flash Timeout timer used if the
mode setting uses this current
0mA to 1000mA (for RISET=10kΩ)
0mA to 700mA (for RISET=14.2kΩ)
Torch (=Preview or Assist) Mode current setting, no timeout
timer used for this current setting
0mA to 500mA (for RISET=10kΩ)
0mA to 350mA (for RISET=14.2kΩ)
Data2<7>
Data3<2:0>
not used – leave at 0
Mode setting
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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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AS3685C.PDF ] | |
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