AMS AS3643 User guide

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high

performance

needs great

design.

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

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AS3643 – AN01 – Demoboard

Preliminary Application Note: 1300mA High Current LED Flash Driver

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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

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AS3643 – AN01 – Demoboard

Preliminary Application Note: 1300mA High Current LED Flash Driver

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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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Copyright

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

AMS AS3643 User guide

AMS AS3643 User guide

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