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Application Note: AS3643 1300mA High Current LED Flash
Driver
Please be patient while we update our brand image as
austriamicrosystems and TAOS are now ams.
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Revision 1.1 / 2012/07/29
Application Note: AN01 – Demoboard Description
AS3643
1300mA High Current LED Flash
Driver
strictly confidential
AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
www.ams.com
Revision 1.1 / 7/29/12
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Table of Contents
1. Further Applications ............................................................................................................... 2
2. Revision Status ...................................................................................................................... 2
3. Getting Started ...................................................................................................................... 2
4. Hardware Overview ............................................................................................................... 3
5. GUI – Software: First Steps ................................................................................................... 5
6. GUI – Software: Overview ..................................................................................................... 6
7. Board Startup ........................................................................................................................ 8
8. PCB Layer Stackup ............................................................................................................. 11
9. AS3643 Demoboard1V0: Application Schematic ................................................................. 12
10. AS3643 Demoboard1V0 Layout: Top View ......................................................................... 14
11. AS3643 Demoboard1V0 Layout: Bottom View .................................................................... 14
Copyright ..................................................................................................................................... 15
Disclaimer ................................................................................................................................... 15
4.1. AS3643 Demoboard1V0 Jumper and Device Locations ................................................ 3
5.1. Updating the USB-Box ............................................................................................... 5
7.1. Indicator Mode ........................................................................................................... 9
7.2. Assist Mode ............................................................................................................... 9
7.3. Flash Mode ...............................................................................................................10
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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1. Further Applications
Visit our homepage: http://www.ams.com
2. Revision Status
AS3643- AN01 - Demoboard Rev.: 1V0
AS3643 Demoboard – Layout Rev.: 1V0
AS3643 Demoboard – Schematic Rev.: 1V0
3. Getting Started
Install the GUI software which can be found on the USB-stick, which is included.
Follow the sequence to connect the AS3643 Board (as shown in the picture below):
1. Connect the amsAG USB-BOX
2. Connect the battery to VBAT and GND
Figure 1:
AS3643 Demoboard, USB-Box & Lion Battery
1
2
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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4. Hardware Overview
4.1. AS3643 Demoboard1V0 Jumper and Device Locations
Figure 2:
Jumper and Device Locations
Jumper
Function
Jumper
Setting
Comment
J1
VOUT1
J2
LED D2 Enable
Y
Enabling LED D2; can be used for
current measurements
J3
Mode Selector
Y
Selecting Dual or Single LED
application
J4
GND
J5
USB-Box Interface Connector
J6
Interface Selector
Y
Selecting between I2C & SWIF IF
J7
General Purpose Measurement
Pinhead
J8
LED OUT 1
Measurement Pinhead
J9
IF Power Jumper
Y
J10
LED OUT 2
Measurement Pinhead
SW1
Strobe Switch
Optional Strobe Function
SW2
Torch Switch
Optional Torch Function
BU1
VBAT
BU2
GND
Device
Value
Comment
U1
AS3643
1300mA High Current LED Flash Driver
C1
100uF
Optional
C2
10uF
Input capacitor: GRM188R60J106UE82, Murata
C3
10uF
Output capacitor: GRM219R61A116U, Murata
C4
100nF
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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D1
FLASH LED
Phaser 2, Osram
D2
FLASH LED
n.m.
L1
1uH
LDCDC: LQM32PN1R0MG0, Murata
Figure 3:
AS3643 Demoboard
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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5. GUI – Software: First Steps
5.1. Updating the USB-Box
Connect the USB-Box (J6) with the PC and start the AS3647/48 Demo Software.
When connecting the USB-Box for the first time, the box has to be updated to the new
version.
Figure 4:
USB-Box Firmware Upgrade
The update can be started by selecting ‘Firmware Upgrade’from the Help Menu.
Figure 5:
USB-Box Firmware Upgrade: Help Menu
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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Open the file ‘usbbox254.hex’ from the ‘USBBox_Firmware’ folder.
Figure 6:
USB-Box Firmware Upgrade: HEX File
Once the update has finished the USB-Box has to be reconnected.
Start the Software new.
6. GUI – Software: Overview
Legend: Definition of the cases described per colour
Write into registers:
Read from registers:
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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LED Output Voltage Level: Shows if
LED_OUT1 level is higher than
LED_OUT2 level or vice versa
Operation Mode:
Indicator Mode/ PWM
Assist Mode
Autofocus or torch
Flash Mode
Miscellaneous:
Frequency Switching
If enabled, frequencies used are
1MHz or 4MHz, if disabled pulse
skip is allowed
Constant Voltage On
Generates costant 5V at VOUT.
Current sinks are disabled
Current Reduction
Flash time
Low Voltage:
Defines at which Voltage levels the AS3648
decreases the LED currents.
External Strobe:
Enables external strobe pin.
LED_OUT Current Settings:
Indicator PWM
Selecting current PWM duty cycle.
LED Currents
Output current for Indicator, Assist and Flash Mode.
Link LED1 & LED2
Combines Output currents in the SW.
Current Boost
Bit to enable the “High current Mode” → max current is
1000mA per LED_Out path.
TX Mask register:
TXMaskTorch Mode
Enable external torch function without I2C.
This function reduces the flash current in
case of parallel operation to the RF power
amplifier and avoids a system shutdown.
Flash TXMask current
Current of TXMask
Coil Peak
Set max. Coil current
Fault & Status Indication: Indication for all safety
features
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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7. Board Startup
First check that the battery is charged!
Connect Battery (~3.7V Lithium Ion) to VBAT
Connect USB Box with the DB @ J6
First of all press the “Readout all registers”-button:
Figure 7:
Readout Registers
If the AS3643 is supplied and connected correctly to the USB-Box, the green line on the
bottom left of the demo software will show the words “USB, AS3648!”
Figure 8:
Status Indicator
The connected device needs to be selected
Figure 9:
Device Selection
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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7.1. Indicator Mode
Click on the Checkbox “Out On” LEDs will turn on.
Select current
It is possible to control the current with the PWM dutycycle
Figure 10:
Indicator Mode
7.2. Assist Mode
Same procedure as Indicator Mode
Figure 11:
Assist Mode
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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7.3. Flash Mode
Select flash time:
If a high current is selected the flash time has to be limited to 100ms
Note: To prevent the LED of thermal damage
Figure 12:
Flash Timings
If the “Flash Mode” gets enabled first time be careful because automatically the “External
Strobe” gets activated
Disable the checkbox “Enable” to produce a flash over the SW
Figure 13:
External Strobe
For a new flash re-enable the “Flash Mode” and the “Out On” checkbox
Figure 14:
Flash Mode
The AS3643will flash
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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8. PCB Layer Stackup
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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9. AS3643 Demoboard1V0: Application Schematic
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
www.ams.com
Revision 1.1 / 7/29/12
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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Revision 1.1 / 7/29/12
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10. AS3643 Demoboard1V0 Layout: Top View
11. AS3643 Demoboard1V0 Layout: Bottom View
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AS3643 – AN01 – Demoboard
Preliminary Application Note: 1300mA High Current LED Flash Driver
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Revision 1.1 / 7/29/12
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Copyright
Copyright © 1997-2012, ams AG, Tobelbader Strasse 30, 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.
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. ams 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. ams
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 ams 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 ams 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 ams AG is believed to be correct and accurate. However, ams 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 ams AG rendering of
technical or other services.
Contact Information
Headquarters
ams AG
Tobelbader Strasse 30
8141 Unterpremstaetten
Austria
T. +43 (0) 3136 500 0
For Sales Offices, Distributors and Representatives, please visit:
http://www.ams.com/contact
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