AMS AS3676 is a highly-integrated CMOS Power and Lighting Management Unit designed for mobile phones and other portable devices. It incorporates a Step-Up DC/DC Converter, a high-power Charge Pump, 13 current sinks, an Analog-to-Digital Converter, LED in-circuit function test, a two-wire serial interface, and control logic all onto a single device. The AS3676 supports ambient light sensor processing and Dynamic Luminance Scaling (DLS) input. Output voltages and currents are fully programmable.
AMS AS3676 is a highly-integrated CMOS Power and Lighting Management Unit designed for mobile phones and other portable devices. It incorporates a Step-Up DC/DC Converter, a high-power Charge Pump, 13 current sinks, an Analog-to-Digital Converter, LED in-circuit function test, a two-wire serial interface, and control logic all onto a single device. The AS3676 supports ambient light sensor processing and Dynamic Luminance Scaling (DLS) input. Output voltages and currents are fully programmable.
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AS3676/AS3676M
Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 1 - 16
1 General Description
The AS3676/AS3676M is a 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
Converter 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 Luminance 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 Resistors 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 (2.5Ω 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 Preview 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
processing 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
Three General Purpose Inputs/Output
VANA/GPI Input, GPIO1/DLS,
GPIO2/LIGHT I/O
Digital Input, Digital Output using
VANA/GPI supply and Tristate
VANA/GPI internal pull down
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)
AS3676M only
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.
AS3676/AS3676M
Flexible Lighting Management (CP, DCDC, 13 Current Sinks,
ADC, LED Test, LDO, DLS and Ambient Light sensing)
Preliminary Application Note, Confidential
ams AG
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AS3676/AS3676M
Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 2 - 16
Application Diagram
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AS3676/AS3676M
Preliminary Application Note, Confidential
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Table of Contents
1 GENERAL DESCRIPTION ............................................................................................................ 1
2 KEY FEATURES .......................................................................................................................... 1
3 APPLICATIONS ........................................................................................................................... 1
4 OTHER APPLICABLE DOCUMENTS AND PAPERS ...................................................................... 4
5 FURTHER APPLICATIONS........................................................................................................... 4
6 REVISION STATUS ...................................................................................................................... 4
7 GENERAL DESCRIPTION ............................................................................................................ 4
8 GETTING STARTED..................................................................................................................... 5
8.1 AS3676 Demo Software Installation..................................................................................................... 5
8.2 Connecting the Demoboard and USB Box with the PC........................................................................ 6
8.3 Starting the AS3676 Demo software .................................................................................................... 6
9 AS3676 WLP DEMOBOARD V1.0 CONNECTOR, JUMPER AND DEVICE LOCATIONS................... 7
10 APPLICATION SCHEMATIC AS3676 DEMOBOARD V1.0 .............................................................. 9
11 AS3676 WLP DEMOBOARD V1.0: STACKUP ............................................................................... 9
12 AS3676 WLP DEMOBOARD V1.0: LAYOUT (TOP VIEW) ............................................................ 10
13 AS3676 WLP DEMOBOARD V1.0: LAYOUT (IN1 VIEW) .............................................................. 11
14 AS3676WLP DEMOBOARD V1.0 LAYOUT (IN2 VIEW) ................................................................ 12
15 AS3676WLP DEMOBOARD V1.0 LAYOUT (BOTTOM VIEW) ....................................................... 13
16 AMBIENT LIGHT SENSING (ALS) .............................................................................................. 14
17 DYNAMIC BACKLIGHT LUMINANCE SCALING (DLS) ................................................................ 15
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www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 4 - 16
4 Other applicable documents and papers
Data Sheet: AS3676_76M 0v4
Application Note(startup sequence flow chart): AN3676_startup 1V0
5 Further Applications
Applications based on the AS3676 are continuously updated. Visit our home-page:
http: //www.austriamicrosystems.com
6 Revision status
AS3676 Datasheet Rev.: 0v4
AN3676 Application note (this document): Rev.: 1v0
AS3676 WLP Demoboard schematic: Rev.: 1v0
AS3676 WLP Demoboard layout Rev.: 1v0
AS3676 Software version Rev.: 0v3
7 General description
Remark: all subsequent component numbering refers to the application schematics, shown in pt. Application
Schematic.
ams AG
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 5 - 16
8 Getting Started
8.1 AS3676 Demo Software Installation
Start the demo software Installation Shield with “Install Demo Software”.
Specify the installation folder.
The Install Shield will guide you through the rest of the installation.
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8.2 Connecting the Demoboard and USB Box with the PC
After the successful installation of the demo software, the USB Box can be connected to the PC and to the
demoboard as shown in the picture below.
8.3 Starting the AS3676 Demo software
The correct installed demo software can be started from Start > Programs > austriamicrosystems AG > AS3676
Demosoftware. USB connection and ASIC status are immediately indicated in the status bar of the demo
software.
The different register settings can be changed through the GUI of the demosoftware, additionally you can use the
register table to change single bits. The register table can be opened by clicking the button “Registers”. The GUI
settings are periodically updated by activating the ‘register polling’ checkbox.
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Preliminary Application Note, Confidential
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9 AS3676 WLP Demoboard V1.0 Connector, Jumper and Device
locations
Listed below are the various connectors and jumpers.
Jumper
Function
Description
J1 DCDC/VBAT select This jumper is used to connect the LEDs (which are connect to HV
current sinks) either to the DCDC step up or to VBAT
J2 Curr1_MP Used to connect LEDs to CURR1
J3 SC_1 Used to bypass LED D31 - connected to CURR1
J4 CP/VBAT select This jumper is used to connect LEDs either to CP_OUT or to VBAT
J5 DATA To connect DATA (I2C) to USB Box Interface
J6 CLK To connect CLK (I2C) to USB Box Interface
J7 Select supply of I2C V2_5 can be connected to the pull ups of I2C-lines
J8 SC_3 Used to bypassLED D14- connected to current sink CURR30
J9 VANA Used to connect VANA/GPI to C14 / only required if used as LDO-output
J10 Curr32 Used to connect to LEDs to CURR32
J11 Audio In Used for measurement
J12 GND
J13 GND
J14 Curr33 Used to connect to LEDs to CURR33
J15 Used to connect AUDIO_IN to
CURR33
J16 Used to connect AUDIO_IN to
DCDC_FB
J17 Used to connect AUDIO_IN to
GPIO2
J18 Used to connect AUDIO_IN to
GPIO1
J19 TPS Supply Used to connect VANA/GPI to Vcc of TPS856- used for light sensing
J20 Measurement pins
J21 Measurement pins
J22 TPS-2-GPIO2 Used to connect OUT of TPS856 to GPIO2- used for light sensing
J23 DLS_input Used to connect GPIO1 to GND
J60 USB Box Interface Connector
J107 North (Measurment pins) DCDCFORCE,CP_OUT, C2_P, C1_P, C1_N, C2_N
J108 West (Measurment pins) DCDC_GATE, DCDC_SNS, DCDC_FB, DATA, CLK, VBAT
J109 South (Measurment pins) V2_5, Curr1, Curr2, Curr6, Curr30, Curr31, Curr32_TOP, Curr33_TOP,
Rgb1, Rgb2, Rgb3, Curr41
J110 East (Measurment pins) VANA/GPI, GPIO1, GPIO2, VSS_CP, Curr43, Curr42, VSS
BU1 Positive battery supply Main battery supply
BU2 Negative battery supply Main battery ground
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AS3676/AS3676M
Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 8 - 16
Connector and Jumper locations on AS3676 WLP Demoboard V1.0
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 9 - 16
10 Application Schematic AS3676 Demoboard V1.0
Application Schematic AS3676 Demoborad V1.0
11 AS3676 WLP Demoboard V1.0: stackup
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 10 - 16
12 AS3676 WLP Demoboard V1.0: Layout (top view)
Layout (top view)
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 11 - 16
13 AS3676 WLP Demoboard V1.0: Layout (IN1 view)
Layout (IN1 view)
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 12 - 16
14 AS3676WLP Demoboard V1.0 Layout (IN2 view)
Layout (IN2 view)
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 13 - 16
15 AS3676WLP Demoboard V1.0 Layout (bottom view)
Layout (bottom view)
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 14 - 16
16 Ambient Light Sensing (ALS)
Ambient Light Sensing allows you to adjust the brightness of LEDs, used as source of backlight, depending on
the ambient brightness. This ensures an ideal visibility of the display and the keyboard. There are three fully
programmable groups which can be linked to the different current sources. These groups specify the change of
the current in accordance to ambient light, which is measured by a light sensor. For instance, one group could be
used for the keyboard backlight to decrease the current flowing through the LEDs at a rise of ambient brightness.
Additionally an internal smoothing filter is implemented in the AS3676.
An example of a possible configuration:
ALS – configuration of groups
Ambient
Current
Display Backlight
Keyboard Backlight
Funlight
... programmable
LED
Light Intensity
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AS3676/AS3676M
Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 15 - 16
17 Dynamic Backlight Luminance Scaling (DLS)
Dynamic Backlight Luminance Scaling is used to reduce the power consumption of the display backlight, which
results in an increase of the operating of the device which uses the AS3676. The basic principle is that a picture
shown on the display can be brightened up, so that there is less backlight brightness necessary. This is
especially practicable when showing a dark picture contents on the display.
The control unit to operate DLS is the display processor sending a PWM signal to the AS3676 and in parallel
changing the display content to compensate for a reduced brightness backlight.
An example of use:
DLS - example of use
A reduction down to 42 per cent is quite high and already remarkable for the human eye, so it is recommended
not to dim below 70 per cent.
Data on
Backlight 100%
Human Eye
Backlight 42%
LCD Display
Human Eye
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Preliminary Application Note, Confidential
www.austriamicrosystems.com (mtp) Revision 1.0 / 20080908 16 - 16
Copyright
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-
Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted,
merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Diclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions
appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein or regarding the freedom of the described devices from
patent infringement. Austriamicrosystems AG reserves the right to change specifications and prices at any time
and without notice. Therefore, prior to designing this product into a system, it is necessary to check with
austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support
or lifesustaining equipment are specifically not recommended without additional processing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might
show deviations from the standard production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not
limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect,
special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise
or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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AMS AS3676 is a highly-integrated CMOS Power and Lighting Management Unit designed for mobile phones and other portable devices. It incorporates a Step-Up DC/DC Converter, a high-power Charge Pump, 13 current sinks, an Analog-to-Digital Converter, LED in-circuit function test, a two-wire serial interface, and control logic all onto a single device. The AS3676 supports ambient light sensor processing and Dynamic Luminance Scaling (DLS) input. Output voltages and currents are fully programmable.
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