EVALUATION BOARD DATA SHEET EV161 Evaluation Board for the AAT2862 Backlight LED Driver and Multiple LDO Lighting Management Unit Introduction The AAT2862 evaluation board demonstrates the functionality of the AAT2862 and its application as a highly integrated lighting management unit. The device provides excellent efficiency for both flash and movie modes. All backlight LED channels are provided with excellent current matching. Through the I2C interface, the AAT2862 can be programmed with 30mA to 0.48mA per channel backlight current and the four LDOs' output voltages are programmable from 1.2V to 3.3V. 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 Figures 1 and 2. The actual board layout is also provided in Figures 3 and 4. For additional information, please consult the AAT2862 product datasheet. DC+ 1 2 3 VIN C5 4.7µF C11 100µF (optional) 100µF lab supply bypass J1 VOUT C3 2.2µF C2 1.0µF C1 1.0µF 5 EN 6 BL5 D6 BL7/AUX1 17 D7 BL8/AUX2 16 D8 AGND BL1 LDOD LDOA LDOB IN 15 D4 BL3 14 D3 BL2 13 D2 12 11 9 10 8 D1 C4 4.7µF LDOC C9 2.2µF C8 2.2µF LDOB C7 2.2µF D5 19 18 BL6 BL4 LDOC 7 20 EN PGND SCL C2- 4 21 SDA SCL C1- SDA 22 C2+ 3 IN 2 C1+ OUT 23 24 1 U1 AAT2862 C6 2.2µF VOUT LDOD LDOA Figure 1: AAT2862 Schematic. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012 1 EVALUATION BOARD DATA SHEET EV161 Evaluation Board for the AAT2862 Backlight LED Driver and Multiple LDO Lighting Management Unit VIN R1 1K R2 1K R3 1K VIN 1 SW1 SW2 2 3 4 U2 VDD GP5 GP4 GP3 PIC12F675 VSS GP0 GP1 GP2 C10 1µF 8 7 6 5 R7 330 VIN LED9 RED R5 10K SW3 J2 R4 10K SCL SCL SDA VIN DC- J3 SDA J4 EN EN R6 100K Figure 2: AAT2862 Microcontroller Schematic. Getting Started Connect the external power (3.6V - 4.2V, typical battery operational range) to the DC+ and DC- terminals. A jumper labeled J1 is inline with the terminal VIN to turn power ON/OFF. The red LED9 should illuminate, indicating that power has been connected. The two jumpers J2 and J3 are the clock SCL and data SDA lines for the I2C interface. There is an additional jumper J4 that connects the enable signal EN to the AAT2862. The user interface is provided by three buttons: SW1, SW2, and SW3. The modes of operation are detailed in Table 1. The SW1 button controls the four LDOs. The SW2 button controls the MAIN backlight. The SW3 button controls the SUB channels. The SW1 and SW2 buttons pressed together control MAIN+SUB backlight fade-out. The SW1 and SW3 buttons pressed together control MAIN+SUB backlight fade-in. All three buttons (SW1, SW2, and SW3) pressed together reset the registers of the AAT2862 and turn off the LEDs. 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012 EVALUATION BOARD DATA SHEET EV161 Evaluation Board for the AAT2862 Backlight LED Driver and Multiple LDO Lighting Management Unit Figure 3: AAT2862 Evaluation Board Top Layer. Figure 4: AAT2862 Evaluation Board Bottom Layer. AAT2862 Evaluation Board User Interface Functionality Button(s) Pushed SW1 (LDOs) SW2 (MAIN) SW3 (SUB) SW1 + SW2 SW1 + SW3 SW1 + SW2 + SW3 Description [Push/Release once] All LDOs will be turned on with default output voltage 1.2V. Every push release will increment output voltage according to datasheet table. [Push/Release once] Turning on the MAIN backlight LEDs with default current 30mA per channel. Every push release will decrement the current according to datasheet table. [Push/Release once] Turning on the SUB backlight LEDs with default current 30mA. Every push release will decrement the current according to datasheet table. [Push/Release once] Turning on all MAIN+SUB backlight LEDs with default current 30mA. The current starts to fade-out automatically down to 0.48mA per channel. [Push/Release once] Turning on the all MAIN+SUB backlight LEDs with default current 0.48mA. The current will increase automatically up to 30mA per channel. [Push/Release once] Reset all registers to default. Table 1: AAT2862 Evaluation Board User Interface Functionality. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012 3 EVALUATION BOARD DATA SHEET EV161 Evaluation Board for the AAT2862 Backlight LED Driver and Multiple LDO Lighting Management Unit AAT2862 Evaluation Board Component Listing Component Part Number Description Manufacturer U1 U2 SW1 – SW3 R1, R2, R3 R4, R5 R6 R7 C3, C6, C7, C8, C9 C1, C2, C10 C4, C5 D1-D8 LED9 J1, J2, J3, J4 AAT2862IMK PIC12F675 PTS645TL50 Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R71A225KE15 GRM216R61A105KA01 GRM18x LW M673 CMD15-21SRC/TR8 PRPN401PAEN Backlight LED driver with 4 LDOs 8-bit CMOS, FLASH-based μC; 8-pin PDIP package Switch Tact, SPST, 5mm 1kΩ, 5%, 1/4W; 0603 10kΩ, 5%, 1/4W; 0603 100kΩ, 5%, 1/4W; 0603 330Ω, 5%, 1/4W; 0603 2.2µF, 10V, X7R, 0603 1µF, 10V, X5R, 0603 4.7µF, 10V,X5R, 0603 Mini TOPLED White LED; SMT Red LED; 0603 Conn. Header, 2mm zip Skyworks Microchip ITT Industries Vishay Vishay Vishay Vishay MuRata MuRata MuRata Lumileds, Philips Chicago Miniature Lamp Sullins Electronics Table 2: AAT2862 Evaluation Board Component Listing. Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202285A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 22, 2012