1811 DOTS MATRIX LED DRIVER DESCRIPTION RECOMMENDED EQUIPMENT The IS31FL3743A is a general purpose 18n (n=1~11) 5.0V, 2A power supply LED Matrix programmed via 1MHz I2C compatible interface. Each LED can be dimmed individually with ABSOLUTE MAXIMUM RATINGS 8-bit PWM data and 8-bit DC scaling data which allowing 256 steps of linear PWM dimming and 256 5.5V power supply steps of DC current adjustable level. Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. Additionally each LED open and short state can be detected, IS31FL3743A store the open or short information in Open-Short Registers. The Open-Short PROCEDURE Registers allowing MCU to read out via I2C compatible The IS31FL3743A evaluation board is fully assembled interface, inform MCU whether there are LEDs open or and tested. Follow the steps listed below to verify short and the locations of open or short LEDs. board operation. Caution: Do not turn on the power supply until all connections FEATURES are completed. Supply voltage range: 2.7V to 5.5V 1) Short JP1 to enable the control of board MCU 18 current sinks (Maximum) (default status). Support 18n (n=1~11) LED matrix configurations 2) Connect the 5VDC power to VCC/GND of CON4, Individual 256 PWM control steps or plug in the USB power input to micro-USB. Individual 256 DC current steps 3) Turn on the power supply, pay attention to the Global 256 DC current steps supply current. If the current exceeds 1A, please check for circuit fault. SDB rising edge reset I2C module 24kHz PWM frequency 1MHz I2C-compatible interface EVALUATION BOARD OPERATION State lookup registers The IS31FL3743A evaluation board has five display Individual open and short error detect function modes. Press K1 to switch configurations: 180 degree phase delay operation to reduce Note: See Appendix for each modes detail. power noise 1) (Default mode) Rainbow 1. De-Ghost 2) Rainbow 2. Cascade for synchronization of chips 3) Purple breath. UQFN-40 (5mm5mm) package 4) Change colors. 5) White. QUICK START Note: IS31FL3743A solely controls the FxLED function on the evaluation board. Figure 1: Photo of IS31FL3743A Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31FL3743A-QULS4-EB -40C to +125C, Industrial UQFN-40, 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, 08/15/2018 1811 DOTS MATRIX LED DRIVER SOFTWARE SUPPORT The steps listed below are an example using the Arduino for external control. JP1 default setting is close circuit. If it is set to open, the on-board MCU will stop working. The SPI pins and The Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick SDB pin are set to High Impedance. External SPI and SDB signals can be connected to TP4 to control the firmware updates. First download the latest Arduino Integrated Development Environment IDE (1.6.12 or IS31FL3743A LED driver. greater) from www.arduino.cc/en/Main/Software. Also download the Wire.h library from www.arduino.cc/en/reference/wire and verify that pgmspace.h is in the directory program Files(x86)/Arduino/hardware/tools/avr/avr/include/avr /. Then download the latest IS31FL3743A test firmware (sketch) from the Lumissil website