EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver Introduction The AAT3103 EVAL board demonstrates the functionality of the AAT3103 and its application as a white LED driver. The AAT3103 is a charge-pump based, current-source white LED driver capable of driving LEDs up to 30mA each. The AAT3103 drives one to three WLEDs. The AAT3103 automatically switches between 1x mode and 2x mode to maintain the highest efficiency and optimal LED current accuracy and matching over a wide input voltage range (2.7V ~ 5.5V). The AAT3103-1/-2 are programmable with Skyworks S2Cwire™ (Simple Serial Control) serial interface. The LED constant current levels are set with 16 steps in the AAT3103-1, and 8 steps in the AAT3103-2. The AAT3103-4 uses a PWM interface to control LED current by modulation of the PWM signal duty cycle. This document describes the evaluation board and its accompanying user interface. A brief “Getting Started” section is also included to help the user quickly begin operating the evaluation board. A schematic of the complete circuit appears in Figure 2; Figure 5 and Figure 6 depict the actual board layout. For additional information, please consult the AAT3103 product datasheet. Board Picture (a) Top Side (b) Bottom Side Figure 1: AAT3103 Evaluation Board Pictures. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 1 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver Schematic J1 DC+ DC- C2 1µF D3 JP2 JP1 C1 1µF C3 1µF D2 AAT3103-1 White LED Driver D1 JP3 JP4 U1 AAT3103 1 2 3 4 5 D1 D2 OUT D3 CAGND C+ RSET IN EN/SET JP5 10 9 8 7 6 R1 14.3k S2Cwire Microcontroller R2 20k R5 R4 R3 1k 1k 1k S1 UP U2 PIC12F675 1 2 3 4 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 VR1 10k 8 7 6 5 S2 DOWN S3 CYCLE R7 C4 330 0.1µF LED2 Red R6 330 LED1 Green Figure 2: AAT3103-1/-2/-4 Evaluation Board Schematic. Getting Started The board has two terminals labeled DC- and DC+ for the input power supply connections. A jumper is inline with the supply bus for connecting/disconnecting power (J1) to MCU. To apply power to the board, set the J1 jumper to the left; the red LED2 should illuminate, indicating that power has been connected to the board. Short line jumper is to connect the AAT3103 power IN into the power line. The green LED1 should flash once when the interface line has a change (S2C signal written or PWM signal duty change). For operation with the accompanying microcontroller and user interface, ensure that the jumper EN is connected. The user interface is provided by three buttons: CYCLE, UP and DOWN. To AAT3103-1/-2, the three buttons are used to transfer S2C signal; to AAT3103-4, the three buttons are used to transfer PWM signal. VR1 is used to change the PWM frequency from 1.6kHz to 14kHz. Only when any one of the three buttons is pressed, the changed PWM frequency is valid. 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver CYCLE, UP and DOWN Button Usage in AAT3103-1/-2 The modes of operation are detailed in Table 1. Each button controls a particular function. The WLED current value is shown in Figure 3. • Up button: The Up button increments the number of EN edges according to Table 1. By holding down the Up button for more than 1.5 seconds, the microcontroller enters auto-increment mode. • Down button: The Down button decrements the number of EN edges according to Table 1. By holding down the Down button for more than 1.5 seconds, the microcontroller enters auto-decrement mode. • Cycle button: The Cycle button toggles on/off auto-cycling. The UP button increments to the next number of EN/SET edges. • Cycle + Up + Down button: Enable line is pulled low. All WLEDs are turned off. WLED Current vs. S2C Step (AAT3103-1; RSET = 14.3kΩ) WLED Current (mA) 25 WLED1 WLED2 WLED3 20 15 10 5 0 1 4 7 10 13 16 S2C Wire Data Register Figure 3: Programming the AAT3103-1 LED Current with RSET = 14.3kΩ. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 3 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver CYCLE, UP and DOWN Button Usage in AAT3103-4 The modes of operation are detailed in Table 2. Each button controls a particular function. The WLED current value is shown in Figure 4. • Up button: The Up button increments the duty of the PWM signal by 5% based on current duty. By holding down the Up button for more than 1.5 seconds, the microcontroller enters auto-increment mode. • Down button: The Down button decrements the duty of the PWM signal by 5% based on current duty. By holding down the Down button for more than 1.5 seconds, the microcontroller enters auto-decrement mode. • Cycle button: When cycle button is pressed, the duty of PWM signal will increment or decrement the duty by 5% step. MCU will set the duty up or down cycle based on the current duty value and latest duty up or down status. The auto duty changing range is from 10% to 100%. • Cycle + Up + Down button: Enable line is pulled low. All WLEDs are turned off. PWM Duty vs. WLED Current (AAT3103-4; RSET = 14.3kΩ) 25 ILED (mA) 20 15 10 WLED1 WLED2 WLED3 5 0 0 10 20 30 40 50 60 70 80 90 100 PWM Duty (%) Figure 4: Programming the AAT3103-4 LED Current with RSET = 14.3kΩ. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver User Interface Functionality Button(s) Pushed Up Down Cycle Cycle + Up + Down Description [Push/Release once] Increment the number of EN edges. Toggles through the available brightness level settings for the backlighting section. [Holding 1.5 sec.+] Auto-increment through the settings. [Push/Release once] Decrement the number of EN/SET edges. Toggles through the available dimming level settings for the backlighting section. [Holding 1.5 sec.+] Auto-decrement through the settings. [Push/Release once] Toggle on/off auto-cycling. Auto-increments EN/SET edges and cycles through the available brightness level settings. Reset. Enable line is pulled low. Table 1: AAT3103-1/-2 User Interface Functions. Button(s) Pushed Up Down Cycle Cycle + Up + Down Description [Push/Release once] Increment the duty of the PWM signal by 5%. [Holding 1.5 sec.+] Auto-increment the duty from 10% to 100% by 5% step. [Push/Release once] Decrement the duty of the PWM signal by 5%. [Holding 1.5 sec.+] Auto-decrement through the settings. [Push/Release once] Auto-cycling. The duty changing range from 10% to 100% with 5% step. Reset. Enable line is pulled low. Table 2: AAT3103-4 User Interface Functions. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 5 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver Layout Figure 5: AAT3103 Evaluation Board Top Layer. Figure 6: AAT3103 Evaluation Board Bottom Layer. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 EVALUATION BOARD DATA SHEET EV158 Evaluation Board for the AAT3103 Low-Cost Three-Channel Charge-Pump LED Driver AAT3103 EVAL Component Listing Component Part Number U1 U2 C1, C2, C3 C4 R1 R2 R3, R4, R5 R6, R7 VR1 D1, D2, D3 LED1 LED2 S1, S2, S3 AAT3103 PIC12F675 GRM188R61A105K GRM21BR71E104K RC0603FR-0714K3L RC0603FR-0720KL RC0603FR-071KL RC0603FR-07330RL RS--0805UW Description Low-Cost 2-/3-Channel Charge-Pump LED Drivers 8-Pin FLASH-Based 8-Bit CMOS Microcontrollers Cap Ceramic 1μF 10V X5R 0603 10% Cap Ceramic 0.1μF 25V X7R 0805 10% RES 14.3KΩ 1/10W 1% 0603 SMD RES 20KΩ 1/10W 1% 0603 SMD RES 1KΩ 1/10W 1% 0603 SMD RES 330Ω 1/10W 1% 0603 SMD Resistors, variable 10K SMD White LED Green LED Red LED 6×6×4.3 press-button Manufacturer Skyworks Microchip Murata Murata Yageo Yageo Yageo Yageo Readystar Electronics Table 3: AAT3103 EVAL Board Component List. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202355A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 10, 2012 7