IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT The IS31BL3228B is a low noise, constant frequency charge pump DC/DC converter for white LED applications. The IS31BL3228B is capable of driving up to six channels of LEDs at preset 20mA per channel from a 2.8V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. The serial digital input is used to enable, disable, and set current for each LED with 14 settings down to 1.8mA. FEATURES Supply voltage range from 2.8V to 5.5V Fully programmable current with single wire 14 current levels Drives up to six channels of LEDs No inductors, low noise operation Built-in thermal protection Automatic soft start Low shutdown current: ISHDN <3μA UTQFN-12 (2mm × 2mm ) package 5.0V, 2A power supply ABSOLUTE MAXIMUM RATINGS ≤ 5.5V power supply Caution: Do not exceed the conditions listed above; otherwise the board will be damaged. PROCEDURE The IS31BL3228B evaluation board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) 2) 3) QUICK START 4) Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect the DC power to the connector (DC IN). Turn on the power supply and pay attention to the supply current. If the current exceeds 600mA, please check for circuit fault. Press Level- or Level+ button to change current of LEDs.The intensity of LEDs will be in 1 level (highest) when power on. The button (SD/EN) controls the IS31BL3228B shutdown or enable. When power on the IS31BL3228B is enabled and the LED (D21) is on. Figure 1: Photo of IS31BL3228B Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31BL3228B-UTLS2-EB -40°C to +85°C (Industrial) UTQFN-12, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-6600. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 11/25/2014 1 IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE EVALUATION BOARD OPERATION SOFTWARE SUPPORT The IS31BL3228B evaluation board performs constant output current with Pulse Count Control (PCC wire) serial interface. The interface records rising edges of the EN/SET pin and decodes them into 14 different states. Please refer to the integrated program. The evaluation board uses a MCU generating Pulse signal at EN/SET pin adjusting the LEDs current. There are 14 blue LEDs (D7~D20) above the buttons showing the intensity level. Please refer to the datasheet to get more information about IS31BL3228B. Note: The jumper JP1 is closed (Default). If JP1 is open, the MCU in the board will stop working and EN/SET pin will be in high-impedance state. The EN/SET pin (TP3) can be connected to external MCU to control the IS31BL3228B. Note: IS31BL3228B solely controls the white LEDs function on the evaluation board. TP1 CON1 DC IN 1 3 2 C1 10uF 3V VDD SD VOUT GND BP 5 C6 10nF C5 1uF U1 C7 1uF 3 VCC Vout 2 C2 2.2uF R5 100K D1 4 3V R2 100K TP2 VCC 4 LDO R4 100K K1 KEY1 LEVEL+ K2 KEY2 EN/SD K3 KEY3 JP1 CTRL TP3 5 EN/SET 6 R1 100K D0 C+ D1 C3 1uF R3 100K LEVEL- OPEN=EXT CTRL VCC U2 VCC C- D2 D3 EN/SET D4 7 GND D5 D2 D3 D4 D5 D6 C4 2.2uF 1 12 11 10 9 8 IS31BL3228B R20 LED20 1K 3V D20 3V D13 R19 LED19 1K D19 D12 R18 LED18 1K D18 D11 R17 LED17 1K D17 D10 R16 LED16 1K D16 D9 R15 LED15 1K D15 D8 R14 LED14 1K D14 D7 R6 LED21 1K D21 U3 3V LED7 LED12 LED13 LED14 LED15 LED16 LED17 LED18 3 26 25 24 23 22 20 19 P0.0/CMP2/KBI0/AD01 VDD P0.1/CIN2B/KBI1/AD10 P0.2/CIN2A/KBI2/AD11 P2.0/ICB/DAC0/AD03 P0.3/CIN1B/KBI3/AD12 P2.1/OCD/AD02 P0.4/CIN1A/KBI4/DAC1/AD13 P0.5/CMPREF/KBI5 P2.5/SPICLK P0.6/CMP1/KBI6 P2.6/OCA P0.7/T1/KBI7 P2.7/ICA 21 1 2 R13 LED13 1K LED9 LED8 R12 LED12 1K 16 LED20 27 LED11 28 LED10 R11 LED11 1K TP4 LED19 EN/SET CTRL KEY1 KEY2 RST KEY3 LED21 18 17 12 11 10 6 5 4 P1.0/TXD P1.1/RXD P1.2/T0/SCL P1.3/INT0/SDA P1.4/INT1 P1.5/RST P1.6/OCB P1.7/OCC/AD00 P2.2/MOSI P2.3/MISO P3.0XTAL2/CLKOUT P3.1/XTAL1 P2.4/SS 13 14 9 8 15 3V LED16 LED15 RST GND 5 4 3 2 1 ICP VSS R10 LED10 1K R9 LED9 1K R8 LED8 1K 7 R7 LED7 1K LPC936 Figure 2: IS31BL3228B Application Schematic Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 11/25/2014 2 IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE BILL OF MATERIALS Name Symbol LED Driver U1 LDO Description Qty Supplier Part No. White LED driver 1 ISSI IS31BL3228B U2 Low-dropout regulator 1 PAM PAM3101 MCU U3 Microcontroller 1 NXP LPC936 LED D7~D21 Diode, LED Blue, SMD 15 Everlight 19-217/BHCZL1M2RY/3T LED D1~D6 Diode, LED White, SMD 6 Everlight EHP-C04/UT01-P01/TR Resistor R1~R5 RES,100k,1/16W,±5%,SMD 5 YAGEO RC0603JR-07 100KL Resistor R6~R20 RES,1k,1/16W,±5%,SMD 15 YAGEO RC0603JR-07 1KL Capacitor C1 CAP,10µF,16V,±10%,SMD 1 YAGEO CC0805KRX7R7BB106 Capacitor C2,C4 CAP, 2.2µF,16V,±10%,SMD 2 YAGEO CC0603KRX7R7BB225 Capacitor C3,C5,C7 CAP,1µF,16V,±10%,SMD 3 YAGEO CC0603KRX7R7BB105 Capacitor C6 CAP,10nF,16V,±10%,SMD 1 YAGEO CC0603KRX7R7BB103 Button K1~K3 Buttons SMD 3 Bill of Materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 11/25/2014 3 IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE 0 0 2 1 2 1 2 2 2 2 1 2 0 0 Figure 3: Board Component Placement Guide - Top Layer Figure 4: Board PCB Layout - Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 11/25/2014 4 IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE 0 0 2 1 2 1 2 2 2 2 1 2 0 0 Figure 5: Board Component Placement Guide - Bottom Layer Figure 6: Board PCB Layout - Bottom Layer Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 11/25/2014 5