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PDF AS3676 Data sheet ( Hoja de datos )
| Número de pieza | AS3676 | |
| Descripción | Flexible Lighting Management | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3676 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Datasheet
AS3676
Flexible Lighting Management (CP, DCDC, 13 Current Sinks,
ADC, LED Test, LDO, DLS and Ambient Light sensing)
1 General Description
The AS3676 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 AS3676 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,
LED in-circuit function test, a two wire serial interface,
and control logic all onto a single device. It supports
ambient light sensor processing and a Dynamic Lumi-
nance Scaling (DLS) input. Output voltages and output
currents are fully programmable.
The AS3676 is part of the austriamicrosystems AS3675,
AS3687/87XM and AS3689 lighting management unit
family. It is software compatible to AS3687/87XM and
AS3689 and pin and software compatible to AS3675.
2 Key Features
High-Efficiency Step Up DC/DC Converter
- Up to 26V/50mA 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 400mA/500mA pulsed
- Efficiency up to 95%
- Very Low effective Resistance (2.5 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
- Dynamic Luminance Scaling (DLS) support to
improve backlight operating time (can adjust any
current source)
- Light Sensor input with internal hardware process-
ing to control backlight according to ambient light
using 3 groups - any current source can select one
of the groups or no light sensor control
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: VANA/GPI, GPIO1/DLS,
GPIO2/LIGHT, all current sources, VBAT, CPOUT,
DCDC_FB
- Internal Temp. Measurement
- Light Sensor input with Java support (JSR-256):
read ADC processed value
Support for automatic LED testing (open and
shorted LEDs can be identified)
Strobe Timeout protection
- Up to 1600ms
- Three different timing modes
Two General Purpose Inputs/Output
- GPIO1/DLS, GPIO2/LIGHT
- Digital Input, Digital Output using VANA/GPI sup-
ply and Tristate
- GPIOs Programmable Pull-Up/Down
Programmable LDO
- 1.8 to 3.35V, 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(s)
- Color and Brightness depends on audio amplitude
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/AS3676
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1 page  
AS3676
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 (26V) Pin
Analog Output (3.3V)
Supply Pad
Ground Pad
www.austriamicrosystems.com/AS3676
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5 Page 
AS3676
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/50mA1. A constant switching-frequency results in a low noise on the supply and output voltages.
Figure 11. Step Up DCDC Converter Block Diagram Option: Current Feedback with Over voltage protection
/
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3
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6
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AS3676
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
1. The AS3676 internal driver structure allows output voltage higher than 25V. The Over voltage Protection in
Current Feedback Mode (see page 13) or Voltage Feedback (see page 14) should be set to fit to the exter-
nal components used (maximum voltage rating of Q1, C9 and D1).
www.austriamicrosystems.com/AS3676
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3676.PDF ] | |
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