1811 DOTS MATRIX LED DRIVER WITH 12MHZ SPI DESCRIPTION RECOMMENDED EQUIPMENT The IS31FL3743B is a general purpose 18n (n=1~11) 5.0V, 2A power supply LED Matrix programmed via 12MHz SPI interface. Each LED can be dimmed individually with 8-bit PWM ABSOLUTE MAXIMUM RATINGS data and 8-bit DC scaling data which allowing 256 steps of linear PWM dimming and 256 steps of DC 5.5V power supply current adjustable level. Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. Additionally each LED open state can be detected, IS31FL3743B store the open information in Open- Registers. The Open Registers allowing MCU to read PROCEDURE out via SPI, inform MCU whether there are LEDs open The IS31FL3743B evaluation board is fully assembled or short LEDs. and tested. Follow the steps listed below to verify board operation. FEATURES Caution: Do not turn on the power supply until all connections Supply voltage range: 2.7V to 5.5V are completed. 18 current sinks (Maximum) 1) Short JP1 to enable the control of board MCU Support 18n (n=1~11) LED matrix configurations (default status). Individual 256 PWM control steps 2) Connect the 5VDC power to VCC/GND of CON4, Individual 256 DC current steps or plug in the USB power input to micro-USB. Global 256 DC current steps 3) Turn on the power supply, pay attention to the supply current. If the current exceeds 1A, please SDB rising edge reset SPI module check for circuit fault. 24kHz PWM frequency 12MHz SPI interface EVALUATION BOARD OPERATION State lookup registers Individual open and short error detect function The IS31FL3743B evaluation board has five display 180 degree phase delay operation to reduce modes. Press K1 to switch configurations: power noise Note: See Appendix for each modes detail. De-Ghost 1) (Default mode) Rainbow 1. Cascade for synchronization of chips 2) Rainbow 2. UQFN-40 (5mm5mm) package 3) Purple breath. 4) Change colors. QUICK START 5) White. Note: IS31FL3743B solely controls the FxLED function on the evaluation board. Figure 1: Photo of IS31FL3743B Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31FL3743B-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, 08/14/2018 1811 DOTS MATRIX LED DRIVER WITH 12MHZ SPI 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 IS31FL3743B 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 IS31FL3743B test firmware (sketch) from the Lumissil website