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PDF AS3675 Data sheet ( Hoja de datos )
| Número de pieza | AS3675 | |
| Descripción | Flexible Lighting Management Unit | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3675 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Datasheet
AS3675
Flexible Lighting Management Unit (Charge Pump, DCDC, 13
Current Sinks, ADC, LED Test, LDO, Audio Controlled Light)
1 General Description
The AS3675 is a highly-integrated CMOS Power and
Lighting Management Unit for mobile telephones, and
other 1-cell Li+ or 3-cell NiMH powered devices.
The AS3675 incorporates one Step Up DC/DC Con-
verter for white backlight LEDs, one high-power Charge
Pump, one Analog-to-Digital Converter, 13 current sinks,
the RGB and white LEDs can be controlled by an audio
input, LED in-circuit function test, a two wire serial inter-
face, and control logic all onto a single device. Output
voltages and output currents are fully programmable.
The AS3675 is part of to the austriamicrosystems
AS3676, AS3687/87XM and AS3689 lighting mange-
ment units family. It is software compatible to AS3687/
87XM and AS3689 and pin and software compatible to
AS3676.
2 Key Features
High-Efficiency Step Up DC/DC Converter
- Up to 16V/55mA (or 25V/35mA) for White LEDs
- Programmable Output Voltage with External Resis-
tors and Serial Interface
- Over voltage Protection
High-Efficiency High-Power Charge Pump
- 1:1, 1:1.5, and 1:2 Mode
- Automatic Up Switching (can be disabled and 1:2
mode can be blocked)
- Output Current up to 300mA/500mA pulsed
- Efficiency up to 95%
- Very Low effective Resistance (2.5Ω typ. in 1:1.5)
- Only 4 External Capacitors Required:
2 x 1µF Flying Capacitors, 2 x 2.2µF Input/Output
Capacitors
- Supports LCD White Backlight LEDs, or RGB
LEDs
13 Current Sinks
- All 13 current sinks fully Programmable (8-bit)
from: 0.15mA to 38.5mA (up to 75.6mA for
CURR30...CURR33)
- Three current sinks are High Voltage capable
(CURR1, CURR2, CURR6)
- Programmable Hardware Control (Strobe, and Pre-
view or PWM)
- Selectively Enable/Disable Current Sinks
Internal PWM Generation
- 8 Bit resolution
- Autonomous Logarithmic up/down dimming
Led Pattern Generator
- Autonomous driving for Fun RGB LEDs
- Support indicator LEDs
10-bit Successive Approximation ADC
- 27µs Conversion Time
- Selectable Inputs: GPIO, all current sources,
VBAT, CPOUT, DCDC_FB
- Internal Temp. Measurement
- Light Sensor input
Support for automatic LED testing (open and
shorted LEDs can be identified)
Support for external Temperature Sensor for high
current LED protection (CURR3x)
Strobe Timeout protection
- Up to 1600ms
- Three different timing modes
Two General Purpose Inputs/Output
- VANA/GPI Input, GPIO Input/Output
- Digital Input, Digital Output using VANA/GPI sup-
ply and Tristate
- VANA/GPI internal pull down
- GPIO Programmable Pull-Up/Down
Programmable LDO
- 1.85 to 3.4V, 150mA
- Programmable via Serial Interface
Standby LDO always on
- Regulated 2.5V max. output 10mA
- 3µA Quiescent Current
Audio can be used to drive RGB LED or up to four
white LEDs
- RGB Color and Brightness is dependent on audio
input amplitude or frequency
White LEDs can be controlled by amplitude or fre-
quency (different modes like bar-type or two and two
LEDs driven by frequency filters)
Wide Battery Supply Range: 3.0 to 5.5V
Two Wire Serial Interface Control
Over current and Thermal Protection
WL-CSP30 3x2.5mm, 0.5mm pitch Package
3 Applications
Power- and lighting-management for mobile telephones
and other 1-cell Li+ or 3-cell NiMH powered devices.
www.austriamicrosystems.com/AS3675
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1 page  
AS3675
Datasheet - Pinout
4.1 Pin Definitions
Table 2. Pin Type Definitions
Type
DI
DO
DIO
AIO
AI
AI_HV
AO3
S
GND
Description
Digital Input
Digital Output
Digital Input/Output
Analog Pad
Analog Input
High-Voltage (15V) Pin
Analog Output (3.3V)
Supply Pad
Ground Pad
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5 Page 
AS3675
Datasheet - Detailed Description
8.2 Step Up DC/DC Converter
The Step Up DC/DC Converter is a high-efficiency current mode PWM regulator, providing output voltage up to e.g.
25V/35mA or e.g. 16V/55mA. A constant switching-frequency results in a low noise on the supply and output voltages.
Figure 12. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection
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3
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AS3675
Table 8. Step Up DC/DC Converter Parameters
Symbol
Parameter
Condition
Min Typ Max Unit
IVDD
Quiescent Current
Pulse skipping mode.
140 µA
VFB1
Feedback Voltage for
External Resistor
Divider
For constant voltage control.
step_up_res = 1
1.20 1.25 1.30 V
VFB2
Feedback Voltage for
Current Sink
Regulation
on CURR1, CURR2 or CURR6 in regulation.
step_up_res = 0
0.4
0.5
0.6
V
IDCDC_FB
Additional Tuning
Current at Pin
DCDC_FB and over
voltage protection
Accuracy of Feedback
Current at full scale
Adjustable by software using Register DCDC
control1
1µA step size (0-31µA)
VPROTECT = 1.25V +
IDCDC_FB * R2
0
-6
31 µA
6%
www.austriamicrosystems.com/AS3675
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3675.PDF ] | |
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