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Revision 2.1 / 2012/07/29
Application Note: AN01 – Demoboard Description
AS3647/48
High Current LED Flash Driver
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 7/29/12
page 1/15
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.
AS 3647/48 Demoboard 1V3 Application Schematic ........................................................... 12
10.
AS3647/48 Demoboard1V3 Layout Top View ..................................................................... 14
11.
AS3647/48 Demoboard1V3 Layout Bottom View ................................................................ 14
Copyright ..................................................................................................................................... 15
Disclaimer ................................................................................................................................... 15
4.1. AS3647/48 Demoboard 1V3 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
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 7/29/12
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1. Further Applications
Visit out home-page: http://www.ams.com
2. Revision Status
AS3647/48 - AN01 - Demoboard Rev.: 1V3
AS3647/48 Demoboard – Layout Rev.: 1V3
AS3647/48 Demoboard – Schematic Rev.: 1V3
3. Getting Started
Install the GUI SW from the USB-Stick which is included in the demo kit.
Follow the sequence to connect the AS3647/48 board as shown in the picture below:
1. Connect the AMS USB-Box
2. Connect the battery to VBAT and GND
Figure 1:
AS3647/48, USB-Box & Li- Ion Battery
1
.
2
.
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High Current LED Flash Driver
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4. Hardware Overview
4.1. AS3647/48 Demoboard 1V3 Jumper and Device Locations
Figure 2:
AS3647/48 Jumper & Devices
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 Have to been jumpered to I2C (SWIF
obsolete)
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 AS3647/48 High Current LED Flash Driver
C1 100uF Optional
C2 10uF Input capacitor: GRM188R60J106UE82, Murata
C3 10uF Output capacitor: GRM219R61A116U, Murata
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
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C4 100nF
D1 Flash LED Phaser 2, Osram
D2 Flash LED Phaser 2, Osram
L1 1uH LDCDC: LQM32PN1R0MG0, Murata
Figure 3:
AS3647/48 Jumper & Devices Demoboard 1V3
AS3647/48 – AN01 – Demoboard
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.
• In some cases it could be that the USB- Box Firmware has to be updated. In this case our
SW detect this automatically and will indicate it, as shown in Fig. 4
• If the USB- Box is already up to date, please proceed to chapter 6 (Gui-SW overview)
directly
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
AS3647/48 – AN01 – Demoboard
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:
Only available at the AS3648, marked with a green box:
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
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Operation Mode:
• Indicator Mode/ PWM
• Assist Mode
• Autofocus or torch
• Flash Mode
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
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.
• Load Balancer ON
Flash time
Fault & Status Indication: Indication for all
safety features
• Low Voltage:
Defines at which Voltage levels the AS3648
decreases the LED currents.
• External Strobe:
Enables external strobe pin.
LED Output Voltage Level: Shows if
LED_OUT1 level is higher than
LED_OUT2 level or vice versa.
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.
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
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7. Board Startup
• First check that the battery is charged!
• Connect the battery (~3.7V Lithium Ion) to VBAT.
• Connect the USB-Box with the Demoboard @ J6.
• If the AS3647/48 is supplied and connected correctly to the USB-Box, the status indicator on
right bottom of the demo software window will be green and show the words “USB,
AS3648!”. If something is wrong it will be red (see fig.7).
Figure 7:
Status Indicator
The current SW version might show the wrong device indication (always AS3648). Will be changed
with the next SW- update
• Select the connected device.
Figure 8:
Device Selection
• Press the ‘Readout Registers’-button.
Figure 9:
Readout Registers
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
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7.1 Indicator Mode
• Enable the checkbox ‘Out On‘ → LEDs will turn on.
o Select current.
o It is possible to control the current with the PWM dutycycle.
Figure 7:
Indicator Mode
7.2 Assist Mode
• Same procedure as Indicator Mode
Figure 8:
Assist Mode
AS3647/48 – AN01 – Demoboard
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 to
prevent thermal damage to the LED.
Figure 9:
Flash Timings
• Enabling the ‘Flash Mode’ for the first time automatically activates the ‘External Strobe’.
• Disable the checkbox ‘Enable’ to control the flash with the SW.
Figure 10:
External Strobe
• To enable the flash repeatedly re-enable the ‘Flash Mode’ and the ‘Out On’ checkbox.
Figure 11:
Flash Mode
• The AS3647/48 demoboard will flash.
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 6/29/12
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8. PCB Layer Stackup
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 6/29/12
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9. AS 3647/48 Demoboard 1V3 Application Schematic
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 6/29/12
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AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
www.ams.com Revision 2.1 / 6/29/12
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10. AS3647/48 Demoboard1V3 Layout Top View
11. AS3647/48 Demoboard1V3 Layout Bottom View
AS3647/48 – AN01 – Demoboard
High Current LED Flash Driver
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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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