IS31BL3228B-UTLS2-EB ISSI

IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT The IS31BL3228B is a low noise, constant frequency 5.0V, 2A power supply 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 ABSOLUTE MAXIMUM RATINGS channel from a 2.8V to 5.5V input. The current sinks 5.5V power supply may be operated individually or in parallel for driving higher current LEDs. Caution: Do not exceed the conditions listed above otherwise the board will be damaged. The serial digital input is used to enable, disable, and set current for each LED with 14 settings down to 1.8mA. PROCEDURE The IS31BL3228B evaluation board is fully assembled FEATURES and tested. Follow the steps listed below to verify board operation. Supply voltage range from 2.8V to 5.5V Fully programmable current with single wire Caution: Do not turn on the power supply until all connections are completed. 14 current levels 1) Connect the ground terminal of the power supply Drives up to six channels of LEDs to the GND and the positive terminal to the VCC. No inductors, low noise operation Or connect the DC power to the connector (DC Built-in thermal protection IN). Automatic soft start 2) Turn on the power supply and pay attention to the Low shutdown current: I <3 A SHDN supply current. If the current exceeds 600mA, UTQFN-12 (2mm 2mm ) package please check for circuit fault. 3) Press Level- or Level+ button to change current of LEDs.The intensity of LEDs will be in 1 level QUICK START (highest) when power on. 4) 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 -40C to +85C (Industrial) UTQFN-12, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. Lumissil Microsystems www.lumissil.com 1 Rev. A, 11/25/2014 IS31BL3228B WHITE LED DRIVER EVALUATION BOARD GUIDE EVALUATION BOARD OPERATION SOFTWARE SUPPORT The IS31BL3228B evaluation board performs constant Please refer to the integrated program. output current with Pulse Count Control (PCC wire) Note: The jumper JP1 is closed (Default). If JP1 is open, the serial interface. The interface records rising edges of MCU in the board will stop working and EN/SET pin will be in the EN/SET pin and decodes them into 14 different high-impedance state. The EN/SET pin (TP3) can be connected to external MCU to control the IS31BL3228B. states. Please refer to the datasheet to get more information about The evaluation board uses a MCU generating Pulse IS31BL3228B. signal at EN/SET pin adjusting the LEDs current. There are 14 blue LEDs (D7~D20) above the buttons showing the intensity level. Note: IS31BL3228B solely controls the white LEDs function on the evaluation board. TP1 CON1 VCC DC IN VCC U2 C1 1 3V 10uF VDD 3 5 SD VOUT C6 C7 U1 TP2 C5 10nF 1uF VCC 1uF 2 4 3 2 GND BP VCC Vout C2 D1 D2 D3 D4 D5 D6 C4 LDO 2.2uF 2.2uF 1 D0 3V 4 C+ 12 D1 C3 R2 R5 R4 R3 1uF 5 11 C- D2 100K 100K 100K 100K LEVEL- K1 KEY1 10 D3 EN/SET 6 TP3 EN/SET LEVEL+ K2 KEY2 9 D4 R1 EN/SD K3 KEY3 100K 7 8 GND D5 OPEN=EXT CTRL JP1 CTRL IS31BL3228B R20 3V U3 LED20 1K D20 3V LED7 3 21 R13 3V R19 P0.0/CMP2/KBI0/AD01 VDD LED12 26 LED13 1K D13 LED19 1K D19 P0.1/CIN2B/KBI1/AD10 LED13 25 1 LED9 P0.2/CIN2A/KBI2/AD11 P2.0/ICB/DAC0/AD03 LED14 24 2 LED8 R12 R18 P0.3/CIN1B/KBI3/AD12 P2.1/OCD/AD02 LED15 23 LED12 1K D12 LED18 1K D18 P0.4/CIN1A/KBI4/DAC1/AD13 LED16 22 16 LED20 P0.5/CMPREF/KBI5 P2.5/SPICLK LED17 20 27 LED11 R11 R17 P0.6/CMP1/KBI6 P2.6/OCA LED18 19 28 LED10 LED11 1K D11 LED17 1K D17 P0.7/T1/KBI7 P2.7/ICA TP4 R10 R16 LED19 18 13 3V LED10 1K D10 LED16 1K D16 P1.0/TXD P2.2/MOSI 5 EN/SET 17 14 LED16 P1.1/RXD P2.3/MISO 4 CTRL 12 9 LED15 R9 R15 P1.2/T0/SCL P3.0XTAL2/CLKOUT 3 KEY1 11 8 LED9 1K D9 LED15 1K D15 RST P1.3/INT0/SDA P3.1/XTAL1 2 KEY2 10 15 GND P1.4/INT1 P2.4/SS 1 RST 6 R8 R14 P1.5/RST KEY3 5 ICP LED8 1K D8 LED14 1K D14 P1.6/OCB LED21 4 7 P1.7/OCC/AD00 VSS R7 R6 LED7 1K D7 LED21 1K D21 LPC936 Figure 2: IS31BL3228B Application Schematic Lumissil Microsystems www.lumissil.com 2 Rev. A, 11/25/2014