ADP5520 LED Driver Reference Design PRD1164 FEATURES • • • • • • Backlight fade in/out Backlight dim Backlight off Backlight ambient light sensing RGB Fun-lighting I2C compatible interface for all programming PRD1164 OVERVIEW The demo board in this PRD demonstrates one application of the ADP5520 LED Driver. The ADP5520 drives up to 6 LEDs in series and a RGB LED. The toggle switch S1 specifies one of two modes of operations for the demo board on GPIO (PC0) of a micro controller. When PB0 transitions from low to high via the push button, the microcontroller is triggered to send an associated I2C signal to the ADP5520 to show backlight fade in/out, backlight dim, ambient light sensing, and RGB fun-lighting features. Figure 1 shows the front and back side demo board overview. Figure 1. Demo Board Front and Back Side) Rev. 1 Reference designs are as supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of reference designs. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Reference designs are not authorized to be used in life support devices or systems. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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Reference Design PRD1164 TABLE OF CONTENTS Features ......................................................................................................................................................................1 PRD1164 Overview....................................................................................................................................................1 Revision History.........................................................................................................................................................2 Description .................................................................................................................................................................3 Demonstration overview ............................................................................................................................................3 Getting Started............................................................................................................................................................4 Demonstrate Group 1 Functions .............................................................................................................................5 Demonstrate Group 2 Functions .............................................................................................................................5 Demo Parameter Setting.............................................................................................................................................7 LED and Backlight LED Setup...............................................................................................................................7 RGB LED current set up .........................................................................................................................................7 Schematic ...................................................................................................................................................................8 Bill of Materials........................................................................................................................................................10 Layout.......................................................................................................................................................................11 Notes.........................................................................................................................................................................13 TABLE OF FIGURES Figure 1. Demo Board Front and Back Side)........................................................................................................1 Figure 2. Demo Board Block ................................................................................................................................3 Figure 3. Demo Board Front Side .........................................................................................................................4 Figure 4. Demo Board Back Side..........................................................................................................................4 Figure 5. Schematic of ADP5520.........................................................................................................................8 Figure 6. ADP5520 control circuit........................................................................................................................9 Figure 7. Top View..............................................................................................................................................11 Figure 8. Bottom View ........................................................................................................................................12 REVISION HISTORY 14/10/2009—Revision 1: Initial Version Rev. 1 | Page 2 of 13 Reference Design PRD1164 DESCRIPTION Figure 2 shows the block diagram for the demo board. The micro controller is the host that sends signal to the ADP5520, which drives flash, torch, and indicator LED. The two different functions of groups are set with a toggle switch S1 and demonstrate what can be accomplished using the ADP5520. Figure 2. Demo Board Block DEMONSTRATION OVERVIEW The components of the demo board were placed on both sides of the PCB. Figure 3 shows the placement of components on the front side of the PCB, which are: • • • • • • the ADP5520 block, backlight LEDs, indictor and interrupt LEDs, a toggle switch, a mode select key, and backlight reactive key other necessary components. Figure 4 shows the placement of components on the back side of the PCB, which are: • • the microcontroller block other passive components. Rev. 1 | Page 3 of 13 Reference Design PRD1164 Figure 3. Demo Board Front Side Figure 4. Demo Board Back Side GETTING STARTED 1. Install the battery in the battery holder at the back side of the PCB. 2. Turn on the switch on the battery holder to power up the system. 3. Set S1 to the left side or right side position to select a function group. Rev. 1 | Page 4 of 13 Reference Design PRD1164 4. Press P1 multiple times to select the different modes for each function group. Refer to Table 1 for more information about the modes. DEMONSTRATE GROUP 1 FUNCTIONS 1. Set S1 to the right side position to demonstrate function group 1. Refer to Error! Reference source not found. to determine the results from pressing P1 various times. The various backlight effects include: • • • Backlight fade in/out Backlight dimming Backlight ambient light sensing (ALS) 2. Press P1 (1st time). • • LED turns ON LED automatically adjusts according to environmental lighting changes. Dark, office, and outdoor modes have been preset on the demo board.with appropriate constant currents. 3. Press P1 again (2nd time). The LED turns off. 4. Press P1 again (3rd time). • • LED turns on with linear fade in and fade off LED automatically adjusts to environmental lighting changes. Dark, office, and outdoor modes have been preset in the demo board. 5. Press P1 again (4th time). The LEDs turn off. Refer to Error! Reference source not found. to determine the results from pressing P1 more times. Note: When P1 is pressed the 7th time (and the 9th and 11th times), the backlight goes dim after 10 seconds and after 10 seconds at dim turns off. When the backlight is off, press button P2 to reactive backlight. DEMONSTRATE GROUP 2 FUNCTIONS 1. Set S1 to the left position to demonstrate function group 2. Refer to Table 1 to determine the results from pressing P1 various times. The various effects include: • • • • RGB LEDs turn on (15mA) without fade in/off RGB LEDs flash on and off (15mA) in SYNC without fade in/off RGB LEDs flash on and off (15mA) in SYNC with fade in/off RGB LEDs turn on in sequence using Square Law DAC Table 1. Demo Functions Group1 S1→right side position:six LED BackLight Press P1 Button 1st keypress 2nd keypress LCD ON Fade In/Out No LCD OFF Rev. 1 | Page 5 of 13 Dim OFF ALS No No Yes Press P2 Button No No Reference Design PRD1164 ON Linear No No Yes 3rd keypress LCD OFF 4th keypress ON Cubic1 No No Yes 5th keypress LCD OFF 6th keypress ON No 10s 10s No 7th keypress LCD OFF 8th keypress ON Linear 10s 10s No 9th keypress LCD OFF 10th keypress ON Cubic1 10s 10s No 11th keypress LCD OFF 12th keypress ON(dark default) No No No No 13th keypress ON(office default) No No No No 14th keypress ON(outdoor default) No No No No 15th keypress LCD OFF 16th keypress Group2 S1→left side position: RGB fun-lighting RGB LEDs for fun-lighting RGB turn on(15mA) constanly without fade in/off 1st keypress RGB LEDs are off 2nd keypress RGB blink flash(15mA) in SYNC without fade in/off 3rd keypress RGB LEDs off 4th keypress RGB blink flash(15mA) in SYNC with fade in/off 5th keypress RGB LEDs off 6th keypress RGB in sequence using Square Law DAC 7th keypress RGB LEDs off 8th keypress Rev. 1 | Page 6 of 13 No No No No Yes No Yes No Yes No No No No Reference Design PRD1164 DEMO PARAMETER SETTING LED AND BACKLIGHT LED SETUP Daylight Max Current 22mA Daylight Dim Current 2mA Office Max Current 5mA Office Dim Current 0.75mA Dark Max Current 1mA Dark Dim Current 0.25mA Backlight Off Timeout 15s Backlight Dim Timeout 10s Backlight Fade-In Time 4.5s Backlight Fade-Out Time 1.5s RGB LED CURRENT SET UP RGB0 Current 15mA RGB1 Current 15mA RGB2 Current 15mA RGB0 on period 0.58s RGB1 on period 0.58s RGB2 on period 1s RGB Fade In Time 1s RGB Fade Out Time 1s Rev. 1 | Page 7 of 13 Reference Design PRD1164 SCHEMATIC Figure 5. Schematic of ADP5520 1 2 Vin VBAT MBR0530 D7 L1 D1 D2 D3 D4 D5 D6 4.7uH C2 C1 1uF/16V 1uF/50V 19 AGND CAP_OUT 21 20 22 BST VBATT RST SCL ILED R2 R3 C4 0.1uF 18 R16 4.7k 16 R13 VDDIO 14 10k 13 C3 C2 VBAT RGB 0 D9 VBAT D10 RGB 2 VBAT Rev. 1 | Page 8 of 13 VBAT VDDIO 15 ADP5520-LFCSP D12 CMP_IN 17 D8 12 6 SDA 11 5 VDDIO C1 4 INT 10 SDA CMP_IN C0 SCL 3 SNS_GND SW R0 R6 2.2k 2 R5 2.2k PGND 9 1 R1 VDDIO VDDIO BL_SNK \INT 8 680 24 BL_GND U1 D11 7 R12 VBAT 23 C3 1uF RGB 1 APDS-9005 Reference Design PRD1164 Figure 6. ADP5520 control circuit SCL SDA RESET 25 PC2 26 PC3 27 PC4 28 PC5 ADC6 PB6/PCINT6/XATL1 AVCC CON3 24 3 23 22 21 20 19 18 VBAT 17 C11 1u PB4 C9 C10 0.1u 1u 16 15 9 PB5 PB3 PB7/PCINT7/XTAL2/TOSC2 1 2 SCK MISO P1 1 VBAT 29 GND1 U2 R8 31 30 AREF PD5 8 GND PB2 7 GND2 14 5 VCC1 PB1 3 1u ADC7 PB0 0.1u C7 VCC 13 6 12 C6 PC0 PD7 4 C8 1u PD4/PCINT20/XCK/T0 11 2 PC1 PD6 VBAT S1 PD3/PCINT19/OC2B/INT1 10 1 PC6 ATmega88 PD1 PD0 PD2 32 VBAT 2 4 3 MOSI 1k R9 4.7k C12 0.1u A06-H-C VBAT U3 C14 2.2 uF 1 2 3 4 VDDIO C15 2.2 uF R14 30K R15 10k ADP1715/16 VBAT J1 MOSI RESET SCK MISO 1 3 5 7 9 8 7 6 5 EN GND1 IN GND2 OUT GND3 ADJ/SS/TRKGND4 2 4 6 8 10 VBAT R7 1k RESET CON10A C13 1u Rev. 1 | Page 9 of 13 RESET Reference Design PRD1164 BILL OF MATERIALS Table 2. Item Bill of Materials Part Reference Description Qty 1 C4,C6,C9,C12 2 C5 C7,C8,C10,C11, C13 C1,C3 C2 Capacitor, Ceramic, 0.1uF,0402,10V,X5R Capacitor, Ceramic, 0.01uF,0402,16V,X7R Capacitor, Ceramic, 1uF,0402,10V,X5R Capacitor, Ceramic, 1uF,16V,0603 Capacitor, Ceramic, 1uF,25V,0805 7 8 9 10 11 C14,C15 D1,D2,D3,D4,D5, D6 D8 D9 D10 D11 Capacitor, Ceramic, 2.2uF, 16V, 0603 Backlght White LED,30mA, 0805,Vf<3.2 RED LED,30mA,0603 BLUE LED,30mA,0603 GRN LED,30mA,0603 RED LED,30mA,0603 12 13 D7 D12 14 L1 Diode, Schottky,SOD123 photosense Inductor, 4.7uH/1.1Apeak， DCR0.15ohm 15 R5,R6 Resistor,2.2K,1/10W, 1%, 0402 16 R7,R8 Resistor,1K,1/10W, 1%, 0402 17 R9,R16 Resistor,4.7K,1/10W, 1%, 0402 18 R10 Resistor,20K,1/10W, 1%, 0402 19 R11 Resistor, 0ohm, 1/10W, 1%, 0402 20 R12 Resistor, 680ohm, 1/10W, 1%, 0402 21 R13 Resistor,10K,1/10W, 1%, 0402 22 R14 Resistor,24.3K,1/10W, 1%, 0402 23 R15 Resistor,10K,1/10W, 1%, 0402 24 25 J1 PUSHBUTTON 3 4 5 6 Manuf./Vendor P/N 4 Murata GRM155R61A104KA01 1 Murata GRM155R71C103KA01 5 2 1 Murata Murata Murata GRM155R61A105KE15 GRM185R61C105KE44 GRM188R61E105KA12 2 Murata GRM188R61C225KE15 6 1 1 1 1 everlight everlight everlight everlight everlight 65-11-UTC-S933-TR8 19-21-R6C-FP2Q2L-3T 19-21-BHC-AN1P2-3T 19-21-GHC-YR1S2-3T 19-21-R6C-FP2Q2L-3T Onsemi Avago MBR0530 APDS-9005 TDK Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Vishay or equiv Sullins Electronics Weixin VLF4012AT-4R7M1R1 1 1 1 2 2 2 1 1 1 1 1 1 SMT headers,10pin 1 PUSHBUTTON 1 Rev. 1 | Page 10 of 13 Manufactur er CRCW04022K2FKED CRCW04021KFKED CRCW04024K7FKED CRCW040220KFKED CRCW04020RFKED CRCW0402680RFKED CRCW04024K7FKED CRCW04024K7FKED CRCW040210KFKED PEC36DAAN TSS4433 Reference Design Item 26 27 28 29 PRD1164 Part Reference Description Qty S1 U1 U2 U3 Mini slide switch Backlight driver Micro Controller LDO 1 1 1 1 LAYOUT Figure 7. Top View J1 = S1 on schematic Rev. 1 | Page 11 of 13 Manufactur er ALPS ADI ATMEL ADI Manuf./Vendor P/N SSSS810701 ADP5520 ATmega88V-10U ADP1715_ADJ Reference Design PRD1164 Figure 8. Bottom View Rev. 1 | Page 12 of 13 Reference Design PRD1164 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Error! Unknow Rev. 1 | Page 13 of 13