EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications Introduction The AAT3369-1 evaluation board demonstrates the functionality of the AAT3369-1 and its application as a white LED driver under Skyworks' S2Cwire serial digital interface and/or PWM interface control. The AAT3369-1 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) conversion to maximize efficiency for white LED applications. It operates over an input voltage range from 2.7V to 5.5V. The AAT3369-1 is capable of driving 6 white LEDs at a total 126mA. This document describes the evaluation board and its accompanying user interface. A brief “Getting Started” section is also included to help the user to begin operating the evaluation board. The AAT3369-1 evaluation board is shown in Figure 1; Figures 2 and 4 depict the board schematic and layout. For additional information, please consult the AAT3369-1 product datasheet. Board Picture a: Top Side b: Bottom Side Figure 1: AAT3369-1 Evaluation Board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 1 EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications Schematic U1 AAT3369-1 C1 DC+ DC+ 3 2 6 1µF J1 3 CIN 1µ F 7 DC- EN/SET PWM 9 R8 20k PWM R7 20k 17 4 18 1 C2 1µF COUT 1µF FCAP CF 56nF EP D1 D2 D3 D4 D5 D6 10 11 12 13 14 15 VMCU S1 DOWN S2 UP D2 D3 D4 D5 D6 R1 0 R2 0 R3 0 R4 0 R5 0 R6 0 AAT 3369-1 White LED Driver EN/SET R10 R11 R12 1k 1k 1k D1 GND 16 8 V_MCU C2+ C2OUTCP OUTCP C1+ C1IN 1 2 3 4 U2 PIC12F675 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 C3 0.1µF 8 7 6 5 VMCU R13 20k R9 1k S2Cwire and PWM Microcontroller LED2 Red 3 2 1 J2 S3 CYCLE Figure 2: AAT3369-1 Evaluation Board Schematic Getting Started The board has two terminals labeled DC+ and DC- for the input power supply connection. Jump the J1 to the left position to connect the DC+ power to AAT3369-1 IN. Jump the V_MCU to connect the DC+ power to microcontroller VIN. Jump PWM and EN/SET to connect the microcontroller GPIOs to the AAT3369-1 PWM and EN/SET. Jump J2 to the S2C position to set the microcontroller to generate S2Cwire signal to control the AAT3369-1 with 32 steps of LED current from 21mA to 0.3mA. Jump J2 to the PWM position to set the microcontroller to generate PWM signal with varied duty cycle from 5% to 100%; this signal is connected to AAT3369-1 PWM pin to control the LED current. After all jumpers are in the correct positions, apply power between 2.7V and 5.5V to the DC+ and DC- terminals to power the AAT33691 (U1) and microcontroller (U2); the red LED (LED2) should illuminate when the microcontroller is powered. Figure 3 shows the connection of the AAT3369-1 board under microcontroller S2Cwire and PWM control. 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications a: Operation under S2C Control b: Operation under PWM Control Figure 3: AAT3369-1 Evaluation Board Demonstration Connection The 6 white LEDs may be dimmed or brightened using the EN/SET serial data S2Cwire interface, PWM interface, or both S2Cwire and PWM interface through the J2 jumper and the three buttons: UP, DOWN and CYCLE. S2Cwire Control Only Jump the J2 to the S2C position to set microcontroller to generate S2Cwire data according to the status of the three buttons. The AAT3369-1 records rising edges of the EN/SET pin and decodes them into 32 maximum individual current level settings from 21mA to 0.3mA as shown in Table 1. • UP button: The UP button increments the number of EN/SET edges from 1 to 32 when you push the button once. By holding down the UP button for more than 0.6 seconds, the microcontroller enters auto-increment mode. The LED will dim and wrap back after S2Cwire data 32. • DOWN button: The DOWN button decrements the number of EN/SET edges from 32 to 1 when you push the button one time. By holding down the Down button for more than 0.6 seconds, the microcontroller enters auto-decrement mode. The LED will brighten and wrap back after S2Cwire data 1. • CYCLE button: The button increments or decrements the number of EN edges automatically and cyclically after single push based on whether the last S2Cwire rising edge number is increasing or decreasing. • UP+DOWN+CYCLE button: Sets the EN/SET to 0V after pressing all the three buttons at the same time. If the PWM is also 0V at the time, the AAT3369-1 is shut down and all white LEDs are turned off. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 3 EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications S2Cwire Data LED Current (mA) S2Cwire Data LED Current (mA) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 21.0 20.3 19.6 19.0 18.3 17.6 16.9 16.3 15.6 14.9 14.2 13.5 12.9 12.2 11.5 10.8 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 10.2 9.5 8.8 8.1 7.5 6.8 6.1 5.4 4.7 4.1 3.4 2.7 2.0 1.4 0.7 0.3 Table 1: S2Cwire Data vs. LED Current1. PWM Control Only The maximum white LED current is 21mA when adopting only PWM control. Before power up, jump J2 to the PWM position to set the microcontroller to generate square waveform with duty cycle changed from 5% to 100% with 5% steps according to the three buttons status. • UP button: The UP button increments the duty cycle from 5% to 100% with 5% steps when you push the button one time. By holding down the UP button for more than 0.6 seconds, the microcontroller enters auto-increment mode. The LED will brighten to 100% and wrap back to 5%. • DOWN button: The DOWN button decrements the duty cycle from 100% to 5% when you push the button one time. By holding down the Down button for more than 0.6 seconds, the microcontroller enters auto-decrement mode. The LED will dim to 5% and wrap back to 100%. • CYCLE button: The duty cycle is incremented or decremented automatically and cyclically after single push based on the last PWM duty cycle setting. • UP+DOWN+CYCLE button: Setting the PWM to 0V after pushing down all the three buttons at the same time. If the EN/SET is also 0V at the time, AAT3369-1 is shut down and all white LEDs are turned off. Both S2Cwire and PWM control When adopting both S2Cwire and PWM control, the maximum LED current can be set by EN/SET S2Cwire interface and LED brightness is changed by PWM with varied duty cycle from the set maximum LED current to almost zero value. The operation steps are 1. Jump J2 to the S2C position. 2. Power on and use one of the three buttons to set the white LED current to a certain value you want as the maximum LED current. 3. Jump J2 to PWM position. 4. Press one of the three buttons to observe the white LED dimming or brightening under the PWM control with varied duty cycle. 1. The LED current accuracy is compromised at high DATA settings. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications User Interface Functionality Button(s) Control S2C UP PWM S2C DOWN PWM CYCLE UP+DOWN+CYCLE S2C PWM S2C PWM Description [Push/Release once]: Increment the number of EN/SET edge; Toggles through the available dimming level settings for the backlighting section. [Push Hold 0.6 sec.+ ]: Auto-increment the number of EN/SET edges up to 32 then wrap back to 1. [Push/Release once]: Increment the duty cycle. [Push Hold 0.6 sec.+ ]: Auto-increment the duty cycle from from 5% to 100% in 5% steps then wrap back to 5%. [Push/Release once]: Decrement the number of EN/SET edge; Toggles through the available brightness level settings for the backlighting section. [Push Hold 0.6 sec.+ ]: Auto-decrement the number of EN/SET edges down to 1 then wrap back to 32. [Push/Release once]: Decrement the duty cycle. [Push Hold 0.6 sec.+ ]: Auto-decrement the duty cycle from 100% to 5% in 5% steps then wrap back to 100%. auto-cycling Set the EN/SET to 0V. Together with PWM 0V to shut down AAT3369-1. Set the PWM to 0V. Together with EN/SET 0V to shut down AAT3369-1. Table 2: User Interface Functionality. Printed Circuit Board a: Top Layer (not to scale) b: Bottom Layer (not to scale) Figure 4: AAT3369-1 Evaluation Board Layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 5 EVALUATION BOARD DATA SHEET EV170 Evaluation Board for the AAT3369-1 High Efficiency Six-Channel, 1X/1.5X Charge Pump for White LED Applications AAT3369-1 EVAL Component Listing Component Part Number U1 U2 R1, R2, R3, R4, R5, R6 R7, R8, R13 R9, R10, R11, R12 C1, C2, CIN, COUT C3 CF D1, D2, D3, D4, D5, D6 LED2 CYCLE, UP, DOWN AAT3369-1IDT PIC12F675 RC0603FR-070RL RC0603FR-0720KL RC0603FR-071KL GRM188R71C105K GRM188R71C104K GRM188R71C563K Description Manufacturer High Efficiency, 6 Channel, 1X/1.5X Charge Pump for White LED Driver 8-Pin FLASH-Based 8-Bit CMOS Microcontrollers Skyworks Microchip Res 0Ω 1/10W 1% 0603 SMD Res 20kΩ 1/10W 1% 0603 SMD Res 1kΩ 1/10W 1% 0603 SMD Cap Ceramic 1μF 0603 X7R 16V 10% Cap Ceramic 0.1µF 0603 X7R 16V 10% Cap Ceramic 56nF 0603 X7R 16V 10% Yageo Murata RS-0805UW 20mA White LED 0805 Realstar 0805KRCT 6*6*5 Red LED 0805 12V 50mA Push button HB E-LT Table 3: AAT3369-1 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. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202288A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012