Introduction The AAT80/ is a total solution IC for portable display applications. Based on a tri-mode charge pump power engine, it is capable of delivering 800mA of output current with individual driving circuitries for light emitting diode (LED) backlights, photo flash, and. The high conversion efficiency and high level of integration make the AAT80/ the optimum solution for battery life and size-critical applications. AnalogicTech s AS Cwire (Advanced Simple Serial Control ) serial digital input is used to enable, disable, and set current for all of the outputs. Each backlight channel can be programmed to 6 levels of current, from a recommended maximum of 0mA programmed by the BSET pin resistor. The AAT80/ can also deliver up to 600mA to drive flash LEDs over four individual channels, with excellent current matching between channels. A built-in safety timer function allows easy, one-trigger system control for photo flash applications. The output can be adjusted to handle up to 60mA, and the AS Cwire signal can drive the module in up to 096 (AAT80) or 6 (AAT8) color intensity combinations. This document describes the evaluation board and its accompanying user interface. In addition, a brief Getting Started section is included to help the user begin operating the evaluation board. A schematic of the complete circuit is shown in Figure. The actual board layout is also provided. For additional information, please consult the AAT80/ product data sheet. Getting Started To apply power to the board, connect the supply by shorting the ON prong to the other prongs in the J header. After shorting the ON prong, the red LED7 should illuminate which indicates that power is connected to the AAT80/ and microcontroller (MCU). To allow the MCU to interact with the AAT80/, connect/short the ON prong to the other prongs in the J header. The user interface is provided by five buttons. The buttons are, FLASH, MOVIE, LIGHT, and DATA. The modes of operation are detailed in Table. Each button handles a particular function: controls the red, blue, and green LEDs, FLASH engages LEDs D7-D8 in flash mode illumination for a specific time duration programmed by the C capacitor, MOVIE engages LEDs D7-D8 for movie mode illumination, LIGHT turns on/off the D-D6 LEDs, DATA increments the data register value of the targeted address, LIGHT+DATA increments the target address of the AS Cwire interface, and LIGHT+DATA+FLASH resets the MCU and turns off the AAT80/. When the DATA button is pressed and not released, the MCU will incrementally auto-cycle through the available values of the data register for the target address after a short delay. For a detailed device functionality description, regarding address functionality and available data register values, please consult the AAT80/ data sheet.
Button(s) Pressed/Released FLASH MOVIE LIGHT DATA LIGHT+DATA LIGHT+DATA+FLASH Description Turns on/off red, blue, and green LEDs Button Press/Release Red LED Blue LED Green LED st on off off nd off on off rd off off on th, repeat off off off Engages flash mode operation (D7-D8 LEDs) for a progammed time duration Turns on/off D7-D8 LEDs for movie mode operation Turns on/off D-D6 LEDs for backlight operation Increments [cycles through when not released] data of targeted address (previously pressed/released button):. [Red LED (address 7), Green LED (address8), Blue LED (address 9)]. MOVIE (address ). LIGHT (address 0). see LIGHT+DATA Increments the target address [default (address 0)]: Button Press/Release Address Decription st Main Backlight D-D nd Sub Backlight D-D6 rd Low Backlight Current th, repeat 0 All Backlight D-D6 Reset. EN/SET is held logic low Table : User Interface Functionality. Schematic VOUT DC+ D D D D D D6 LXCL-PWF D8 J optional 00μF lab supply bypass C7 00μF 0 9 R9 80K R9 = 80K for 0mA/channel backlight EN C 0.μF 6 D D D AGND CT EN/SET D D D6 BSET R G B C+ F F OUT C- F F PGND C- C+ 8 C.0μF C.7μF LXCL-PWF D7 7 8 9 0 7 6 U AAT80/ Optional footprints for auxiliary lighting LEDs R G B C.0μF C.μF Figure : AAT80/ Section Schematic of Evaluation Board. www.analogictech.com EV.007.0..0
R7 0 J EN R8 00K SW SW R K R R R R K K K K U VDD VSS GP GP0 GP GP GP GP PICF67 8 7 6 C6 μf R6 0 LED7 RED SW SW SW Figure : PICF67 Section Schematic of the Evaluation Board. Bill of Materials (BOM) Component Part Number Description Manufacturer U AAT80/ 800mA Total Display Solution for Portable Devices AnalogicTech U PICF67 Microcontroller Microchip 060ZD0K C, C, C6 C608XRE0K μf, 0V, XR or X7R GRM88R6C0K 060ZDK C C608XRCK.μF, 0V, XR or X7R GRM88R6AK C C608XRA7K.7μF, 0V, XR or X7R LMK07BJ7K Taiyo Yuden 060D0K C C608XRH0K 0.μF, 6V, XR or X7R GRM88R6E0K C7 Open N/A N/A D-D6 LW M67C White LED Osram D7, D8 LXCL-PWF Flash White LED Lumileds LED7 CMD-SRC Red LED; 06 CML Innovative Tech, Inc LPCFC-A LED (common anode) Lasemtech, Inc AUX[R,G,B] Open N/A N/A R-R CRCW08000F kω, %, /8W, 080 Vishay R6 CRCW0800RF 0Ω, %, /8W, 080 Vishay R7 CRCW0800RF 0Ω, %, /8W, 080 Vishay R8 CRCW08000F 00kΩ, %, /8W, 080 Vishay R9 CRCW06080F 80kΩ, %, /0W, 060 Vishay R0 Open N/A N/A DATA, LIGHT, MOVIE, FLASH, PTS6TL0 Switch Tact, SPST, MM ITT Industries J, J PRPN0PAEN Connecting Header, mm Sullins Electronics Table : Component Listing.
Printed Circuit Board Figure : AAT80/ Evaluation Board Top Layer (not to scale). www.analogictech.com EV.007.0..0
Figure : AAT80/ Evaluation Board Bottom Layer (not to scale). Advanced Analogic Technologies, Inc. 0 Scott Boulevard, Santa Clara, CA 90 Phone (08) 77-600 Fax (08) 77-6 Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.