IS31BL3231 Flash LED Driver Evaluation Board Guide Description Recommended Equipment IS31BL3231 flash LED driver demo board is used to demonstrate and evaluate the IS31BL3231. The IS31BL3231 is a current-regulated charge pump and ideal for powering high brightness LEDs for camera flash and torch applications. The charge pump can be set to regulate two current levels for Flash Mode and Torch Mode. Features Supply voltage range from 2.7V to 5.5V Output current up to 750mA Adjustable output current in Flash Mode Automatic boost mode Available in DFN-10 (3mm × 3mm) package Quick Start 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 IS31BL3231 demo 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. Connect the ground terminal of the power supply to the GND pin and the power supply’s positive terminal to the VCC pin. 2. Alternatively, a DC source can be connected directly to the (DC IN) connector. 3. Turn on the power supply and pay attention to the supply current. If it is over 2A, please check evaluation board for any faults; if errors are evident please contact ISSI immediately. 4. Switch between Torch Mode and Flash Mode via corresponding push button on board. Figure 1: Photo of IS31BL3231 Evaluation Board Ordering Information Part No. Temperature Range Package IS31BL3231-DLS2-EB -40°C to +85°C (Industrial) DFN-10 (3mm x 3mm), Lead-free Table 1: Ordering Information For additional information regarding orders, pricing, and delivery, please contact ISSI at [email protected] or (408) 969-6600. Integrated Silicon Solution, Inc. – www.issi.com V3, 3/16/2012 1 IS31BL3231 Flash LED Driver Evaluation Board Guide Performance Display The IS31BL3231 Flash LED Driver can function in Flash Mode or Torch Mode. Torch is set as the default mode. Torch Mode: The White LEDs are working in the Torch Mode when power on. There are 8 blue LEDs showing the intensity level. The intensity of LEDs will be increased at 8 steps by pressing the Bright+ button, and decreased by pressing the Bright- button. Press the Torch button in this mode to operating in the Flash Mode. Flash Mode: The Flash Mode is activated when shut down the Torch Mode. The high brightness LEDs will flash once by clicking the Flash button. Software Support Please refer to the integrated evaluation board software. It is pre-programmed for easy set-up and demonstration. For more information on IS31BL3231, please refer to the device’s datasheet. Integrated Silicon Solution, Inc. – www.issi.com V3, 3/16/2012 1 IS31BL3231 Flash LED Driver Evaluation Board Guide U2 U1 VDD_5V VCC_3V 1 C1 10uF VDD 3 C2 10nF SD 2 GND FLASH EN key3 key4 C3 10uF 4 BP 3 26 25 24 23 22 20 19 P0.4 P0.5_LED1 LED2 LED3 LDO VCC_3V SW1 Flash lamp SW2 torch SW3 Bright+ 18 17 12 11 10 6 5 4 LED4 LED5 LED6 key1 key2 RST LED7 LED8 R9 10k key4 key3 R8 10k key2 R7 10k key1 R6 10k SW4 Bright- P0.0/CMP2/KBI0/AD01 P2.0/ICB/DAC0/AD03 P0.1/CIN2B/KBI1/AD10 P2.1/OCD/AD02 P0.2/CIN2A/KBI2/AD11 P2.2/MOSI P0.3/CIN1B/KBI3/AD12 P2.3/MISO P0.4/CIN1A/KBI4/DAC1/AD13 P2.4/SS P0.5/CMPREF/KBI5 P2.5/SPICLK P0.6/CMP1/KBI6 P2.6/OCA P0.7/T1/KBI7 P2.7/ICA 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 P3.0XTAL2/CLKOUT P3.1/XTAL1 VDD VSS 1 2 13 14 15 16 27 28 10k VCC_3V P0.5 P0.4 RST GND D2 R2 LED2 10k D3 R3 LED3 10k D4 R4 LED4 10k 9 8 10k D6 R10 LED6 10k C4 0.1uF 7 D5 R5 LED5 VCC_3V 21 D7 R11 LED7 10k P1 5 4 3 2 1 D1 VCC_3V R1 LED1 5 VOUT LPC936 D8 R12 LED8 10k ICP U3 VDD_5V J1 1 C5 22UF DC CON R13 R14 10k 10k C8 10uF C6 0.1uF 2 C10 3 FLASH 1uF EN 4 5 VIN VOUT C1 PGND C2 SGND FLASH EN R15 91k RFB RSET 10 Vout C7 0.1uF 9 C9 10uF D10 8 7 D11 FB 6 R16 91k IS31BL3231 R17 NC R18 0.22ohm Figure 2: IS31BL3231 Application Circuit Diagram Bill of Materials Name Symbol Description Qty Supplier Part No. LDO U1 Low Drop-out Regulator 1 PAM PAM3101DAB300 MCU U2 System Microcontroller 1 NXP P89LPC936 LED Driver U3 LED Backlighting Driver 1 ISSI IS31BL3231 Diode D1-8 Diode, LED Blue, SMD 8 Everlight 19-217/BHC-ZL1M2RY/3T Diode D10-11 Diode, LED White, SMD 2 Everlight EHP-C04/UT01-P01/TR Resistor R1-R14 RES,10k,1/16W,±5%,SMD 14 - - Resistor R15,R16 RES,91k,1/16W,±5%,SMD 2 - - Resistor R17 Not Connected 1 - - Resistor R18 RES,0.22Ω,1/16W,±5%,SMD 1 - - Capacitor C1,C3,C8,C9 CAP,10µF,16V,±20%,SMD 4 - - Capacitor C2 CAP,10nF,16V,±20%,SMD 1 - - Capacitor C4,C6,C7 CAP,0.1µF,16V,±20%,SMD 3 - - Capacitor C5 CAP,22µF,25V,±20%,SMD 1 - - Capacitor C10 CAP,1µF,16V,±20%,SMD 1 - - Table 2: Bill of Materials. Refer to Figure 2 for additional information. Integrated Silicon Solution, Inc. – www.issi.com V3, 3/16/2012 1 IS31BL3231 Flash LED Driver Evaluation Board Guide 0 0 2 1 2 1 2 3 1 1 2 1 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 V3, 3/16/2012 1 IS31BL3231 Flash LED Driver Evaluation Board Guide 0 0 2 1 2 1 2 3 1 1 2 1 2 1 2 0 0 Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Evaluation Board PCB Layout- Bottom Layer Integrated Silicon Solution, Inc. – www.issi.com V3, 3/16/2012 1 IS31BL3231 Flash LED Driver Evaluation Board Guide Copyright © 2011 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 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 V3, 3/16/2012 1