IS31BL3212 3-Channel Constant Current LED Driver Evaluation Board Guide Description Recommended Equipment The IS31BL3212 provides three regulated current sources, delivers up to 23mA of load current to accommodate three white LEDs. It requires no charge pump, has no noise and significantly improved the efficiency. • The serial digital input is used to enable, disable, and set current for each LED with 16 settings down to 0.69mA. Features • • • • • • • • • 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 Supply voltage range from 2.7V to 5.5V Ultra low headroom voltage Cost effective LED driver Three channel constant current output ideal for driving LEDs Best noise and efficiency performance Ultra low quiescent supply current: 1.0mA (typ.) Highly integrated design, minimal component Low shutdown current: 1.0µA (typ.) SOT-6 package Quick Start The IS31BL3212 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) 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. 2) Turn on the power supply and pay attention to the supply current. If the current exceeds 400mA, please check for circuit fault. 3) Press Level- or Level+ button to change current of white LEDs. The intensity of LEDs will be in 1 level (highest) when power on. 4) The button (SD/EN) controls the IS31BL3212 Shutdown or Enable. When power on the IS31BL3212 is Enable and the LED (D20) is on. Figure 1: Photo of IS31BL3212 Evaluation Board Evaluation Board Ordering Information Part No. IC Package IS31BL3212-STLS2-EB SOT-6, Lead-free Table1: 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 R1.0, 07/09/2012 1 IS31BL3212 3-Channel Constant Current LED Driver Evaluation Board Guide Evaluation Board Operation Software Support The IS31BL3212 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 16 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 16 blue LEDs (D4~D19) above the buttons showing the intensity level. JP1 default is set to close circuit. If it is set to open, the onboard MCU will stop working. The MCU pin to drive the EN/SET pin will set to High Impedance. An external driving signal can be connected to the TP3 connecting point to control the IS31BL3212 LED driver. Refer to the datasheet to get more information about how to control the IS31BL3212 chip. *Note: IS31BL3212 solely controls the white LEDs function on the evaluation board. U3 TP1 CON1 DC IN 3V VCC TP4 5 4 3 2 1 C1 10uF TP2 3V LED12 LED11 RST GND ICP LED7 LED8 LED9 LED10 LED11 LED12 LED13 LED14 3 26 25 24 23 22 20 19 3V 18 R3 R4 R5 R2 100K 100K 100K 100K EN/SET CTRL KEY1 KEY2 RST KEY3 LED6 KEY1 LEVEL- K1 LEVEL+ K2 KEY2 EN/SD K3 KEY3 17 12 11 10 6 5 4 P0.0/CMP2/KBI0/AD01 VDD P0.1/CIN2B/KBI1/AD10 P0.2/CIN2A/KBI2/AD11 P0.3/CIN1B/KBI3/AD12 P2.0/ICB/DAC0/AD03 P0.4/CIN1A/KBI4/DAC1/AD13 P2.1/OCD/AD02 P0.5/CMPREF/KBI5 P2.2/MOSI P0.6/CMP1/KBI6 P2.3/MISO P0.7/T1/KBI7 P2.4/SS P2.5/SPICLK P1.0/TXD P2.6/OCA P2.7/ICA P1.1/RXD P1.2/T0/SCL P1.3/INT0/SDA P3.0XTAL2/CLKOUT P1.4/INT1 P3.1/XTAL1 P1.5/RST P1.6/OCB P1.7/OCC/AD00 VSS 21 1 2 13 14 15 16 27 28 LED18 LED17 LED16 LED15 LED22 LED21 LED20 LED19 9 8 7 CTRL JP1 OPEN=EXT CTRL LPC936 3V U2 3V C4 1uF 2 VDD SD D11 3V VCC 1 3 R14 LED14 1K VOUT GND 5 C5 10nF BP C6 1uF R13 LED13 1K D10 R15 LED15 1K D12 R12 LED12 1K D9 R16 LED16 1K D13 R11 LED11 1K D8 R17 LED17 1K D14 D7 R18 LED18 1K D15 D6 R19 LED19 1K D16 D5 R20 LED20 1K D17 D4 R21 LED21 1K D18 D20 R22 LED22 1K D19 4 LDO VCC VCC U1 3 C2 1uF 2 C3 0.1uF TP3 EN/SET R1 100K 1 R10 LED10 1K D3 VIN D3 GND D2 D1 6 5 R9 LED9 1K D2 D1 R8 LED8 1K 4 R7 LED7 1K EN/SET IS31BL3212 R6 LED6 1K Figure 2: IS31BL3212 Application Schematic Integrated Silicon Solution, Inc. – www.issi.com R1.0, 07/09/2012 2 IS31BL3212 3-Channel Constant Current LED Driver Evaluation Board Guide Bill of Materials Name Symbol LED Driver U1 LDO Description Qty Supplier Part No. 3CH Constant Current LED Driver 1 ISSI IS31BL3212 U2 Low-dropout Regulator 1 PAM PAM3101 MCU U3 Microcontroller 1 NXP LPC936 LED Blue D4~D20 Diode, LED Blue, SMD 17 Everlight LED White D1~D3 Diode, LED White, SMD 3 Everlight Resistors R1~R5 RES,100k,1/16W,±5%,SMD 5 Resistors R6~R22 RES,1k,1/16W,±5%,SMD 17 Capacitor C1 CAP,10µF,16V,±20%,SMD 1 Capacitors C2,C4,C6 CAP, 1µF,16V,±20%,SMD 3 Capacitor C3 CAP,0.1µF,16V,±20%,SMD 1 Capacitor C5 CAP,10nF,16V,±20%,SMD 1 Buttons K1~K3 Buttons SMD 3 Table 2: Bill of Materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com R1.0, 07/09/2012 3 19-217/BHCZL1M2RY/3T EHP-C04/UT01P01/TR IS31BL3212 3-Channel Constant Current LED Driver Evaluation Board Guide 0 0 2 2 1 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 R1.0, 07/09/2012 4 IS31BL3212 3-Channel Constant Current LED Driver Evaluation Board Guide 0 0 2 2 1 1 2 2 2 2 1 2 0 0 Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Board PCB Layout-Bottom Layer Integrated Silicon Solution, Inc. – www.issi.com R1.0, 07/09/2012 5 IS31BL3212 3-Channel Constant Current 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 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 R1.0, 07/09/2012 6