austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems document is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: ams_sales@ams.com
Please visit our website at www.ams.com
AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 1 - 12
1 General Description
The AS3644 is an inductive high efficient DCDC
step up converter driving a current source. The
DCDC step up converter operates at a fixed
frequency of 4MHz and includes soft startup to
allow easy integration into noise sensitive RF
systems. The current source operates in
flash/torch/assist (video/autofocus) and indicator
mode.
The AS3644 includes flash timer, overvoltage,
overtemperature, undervoltage and LED short
circuit protection functions.
The AS3644 is able to detect a broken coil.
Together with the LED short and open detection the
AS3644 can be used to verify the connection to its
external components and allowing in-circuit test.
This reduces test time and simplifies production test
procedures.
The AS3644 is controlled by an I2C interface to
allow sophisticated control of all settings like
currents and timings. The complete flash driver
solution measures only
11mm2 PCB area.
The AS3644 is available in a space-saving WL-CSP
package measuring only 1.5x1.1x0.6mm and
operates over the -30ºC to +85ºC temperature
range.
2 Application
Flash/Torch for mobile phones, digital cameras and
PD
(AS3644 Demoboard V1.0)
AS3644
-
AN01
-
D
emoboar
d
Ultra Small Low Cost 500mA Inductive LED Flash Driver
Preliminary Application Note
ams AG
Technical content still valid
AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 2 - 12
Table of Contents
1 GENERAL DESCRIPTION................................................................................................................. 1
2 APPLICATION.................................................................................................................................. 1
3 FURTHER APPLICATIONS ............................................................................................................... 3
4 REVISION STATUS .......................................................................................................................... 3
5 GENERAL DESCRIPTION................................................................................................................. 3
6 GETTING STARTED ......................................................................................................................... 4
6.1 AS3644 Demo Software Installation ......................................................................................................... 4
6.2 Connecting the Demoboard and USB Box with the PC ............................................................................ 6
6.3 Starting the AS3644 Demo software......................................................................................................... 7
7 AS3644 DEMOBOARD V1.0 JUMPER AND DEVICE LOCATIONS ...................................................... 8
8 APPLICATION SCHEMATIC AS3644 DEMOBOARD V1.0 .................................................................. 9
9 AS3644 DEMOBOARD V1.0: LAYOUT (TOP VIEW) ......................................................................... 11
10 AS3644 DEMOBOARD V1.0: LAYOUT (BOTTOM VIEW) ................................................................. 11
COPYRIGHT ........................................................................................................................................... 12
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
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3 Further Applications
Applications based on the AS3644 are continuously updated. Visit our home-page:
http: //www.austriamicrosystems.com
4 Revision status
AS3644-AN01-Demoboard Rev.: 1v0
AS3644 Demoboard – Layout Rev.: 1v0
AS3644 Demoboard – Schematic Rev.: 1v0
5 General description
Remark: all subsequent component numbering refers to the application schematics, shown in pt. Application
Schematic.
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 4 - 12
6 Getting Started
6.1 AS3644 Demo Software Installation
Start the demo software Installation Shield with by doppel click on AS3644_EvalSW.exe”.
The Install Shield will guide you through the rest of the installation.
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 5 - 12
ams AG
Technical content still valid
AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 6 - 12
6.2 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.
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 7 - 12
6.3 Starting the AS3644 Demo software
The correct installed demo software can be started from Start > Programs > austriamicrosystems > AS3644.
USB connection is immediately indicated in the status bar of the demo software.
The GUI settings are periodically updated.
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 8 - 12
7 AS3644 Demoboard V1.0 jumper and device locations
Listed below are the various connectors and jumpers.
Jumper
Function
comment
J1 LED_out connects pin LED_out to the flash LED
J2 measurement pinhead LED_out / SCL / SDA / VOUT / GND
J3 Vbat
J4 GND
J5 USB Box Interface Connector
SW1 Strobe switch optional strobe function
BU1 VBAT
BU2 GND
Device
Value
comment
U1 AS3644 Ultra Small Low Cost 500mA Inductive LED Flash Driver
C1 not mounted / optional
C2
4.7uF
input capacitor
C3 2x 1.5uF output capacitor
D1
FLASH LED
L1 1µH
R1 3k3 IF pull up
R2 3k3 IF pull up
R3 10k
R4 0R
R5 1M
Connector and Jumper locations of AS3644 Demoboard 1V0
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 201
01504 9 - 12
8 Application Schematic AS3644 Demoboard V1.0
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 201
01504 10 - 12
Application Schematic AS3644 Demoborad V1.0
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 11 - 12
9 AS3644 Demoboard V1.0: Layout (top view)
Layout (top view)
10 AS3644 Demoboard V1.0: Layout (bottom view)
Layout (bottom view)
ams AG
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AS3644 - AN01 - Demoboard
Preliminary Application Note
www.austriamicrosystems.com (dgm) Revision 0.1 / 20101504 12 - 12
Copyright
Copyright © 1997-2010, 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
ams AG
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