IS31FL3731 AUDIO MODULATED MATRIX LED DRIVER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT The IS31FL3731 is a compact LED driver for 144 single 5.0V, 2A power supply LEDs. The device can be programmed via an I2C Audio source( i.e. MP3 player, Notebook PC, etc) compatible interface. The IS31FL3731 offers two 8 speaker blocks each driving 72 LEDs with 1/9 cycle rate. The required lines to drive all 144 LEDs are reduced to 18 by using the cross-plexing feature optimizing space on ABSOLUTE MAXIMUM RATINGS the PCB. Additionally each of the 144 LEDs can be 5.5V power supply dimmed individually with 8-bit allowing 256 steps of linear dimming. Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. To reduce CPU usage up to 8 frames can be stored with individual time delays between frames to play small animations automatically. LED frames can be PROCEDURE modulated with audio signal. The IS31FL3731 evaluation board is fully assembled and tested. Follow the steps listed below to verify FEATURES board operation. If dont want to check the audio function, skip 1) 2) 7) 8), but the audio modes you will Supply voltage range from 2.7V to 5.5V see only a few LEDs turned on. 8 frames memory for animations Caution: Do not turn on the power supply until all connections Picture mode and animation mode are completed. Auto intensity breathing during the switching of 1) Connect an 8 speaker to the SPK connector. different frames 2) Connect the audio source to the AUDIO IN LED frames displayed can be modulated with connector. audio signal intensity 3) Short J3 to connect 3VO and VIO. LED light intensity can be modulated with audio 4) Short J4 to connect PVCC and U1VCC. signal intensity 5) Connect the 5VDC power to the connector QFN-28 (4mm 4mm) and SSOP-28 package (J1&J2). 6) Turn on the power supply/Plug in the Micro USB QUICK START and pay attention to the supply current. If the current exceeds 1A, please check for circuit fault. 7) Turn on the audio signal. 8) Modulation of the audio signal utilized to obtain better sound output performance Figure 1: Photo of IS31FL3731 Evaluation Board (Note: Old version EVB please refer to Appendix ) ORDERING INFORMATION Part No. Temperature Range Package IS31FL3731-QFLS2-EB -40C to +85C (Industrial) QFN-28, 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, 04/20/2017 IS31FL3731 AUDIO MODULATED MATRIX LED DRIVER EVALUATION BOARD GUIDE EVALUATION BOARD OPERATION The IS31FL3731 evaluation board has three animation display modes. Press K1 to switch configurations. 1) Firework animation 2) Lighting animation 3) Power-on animation 4) All on with full brightness Below modes maybe omitted in some early EVB we make: 5) Water drop animation 6) Static graphics breathe dimming effect 7) Triangular music bar effect: more triangular music bars are displayed with stronger music. 8) Equalizer bar effect: EQ bars move up and down with music. 9) Multiple graphics display: different graphics change with music rhythm. Note: IS31FL3731 solely controls the FxLED function on the evaluation board. EXTERNAL SOFTWARE CONTROL J4 default setting is closed (short). If it is set to open, the U1 (LDO) will stop working and all the 3V, including the supply of MCU will be cut off, all the MCU s IO will be high impedance (open-drain) and external control is allowed. The IS31FL3731 can set its I2C bus interface logic threshold based on the voltage on the VIO pin. An external VIO voltage in the range of 1.8VV V IO CC can be applied after removing (open) the J4 jumper. Figure 2: Photo of Arduino connect to Evaluation Board The board comes with J4 default setting closed Follow the steps listed below for external Arduino (short). If it is set to open, the user can connect an control. external VIO voltage supply, the external VIO voltage is recommended to equal to ex-IICs high logic. The Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick Follow the steps listed below for external control. firmware updates. First download the latest Arduino 1) Open J4 to disconnect the power of U1, disable Integrated Development Environment IDE (1.6.12 or the 3V0 (3.0V). greater) from www.arduino.cc/en/Main/Software. 2) Open J3 to disconnect the VIO to 3V0, and Then download the latest IS31FL3731 test firmware connect an external MCU VCC to VIO. (sketch) from the Lumissil website 3) Pull-up the SDB to VIO.