IS31FL3743A 18 11 DOTS MATRIX LED DRIVER August 2018 GENERAL DESCRIPTION FEATURES The IS31FL3743A is a general purpose 18n (n=1~11) Supply voltage range: 2.7V to 5.5V LED Matrix programmed via 1MHz I2C compatible 18 current sinks interface. Each LED can be dimmed individually with Support 18n (n=1~11) LED matrix configurations 8-bit PWM data and 8-bit DC scaling data which Individual 256 PWM control steps allowing 256 steps of linear PWM dimming and 256 Individual 256 DC current steps steps of DC current adjustable level. Global 256 DC current steps Additionally each LED open and short state can be SDB rising edge reset I2C module detected, IS31FL3743A store the open or short Programmable H/L logic: 1.4V/0.4V, 2.4V/0.6V information in Open-Short Registers. The Open-Short 24kHz PWM frequency Registers allowing MCU to read out via I2C compatible interface, inform MCU whether there are 1MHz I2C-compatible interface LEDs open or short and the locations of open or short State lookup registers LEDs. Individual open and short error detect function The IS31FL3743A operates from 2.7V to 5.5V and 180 degree phase delay operation to reduce power noise features a very low shutdown and operational current. De-Ghost IS31FL3743A is available in UQFN-40 (5mm5mm) Cascade for synchronization of chips package. It operates from 2.7V to 5.5V over the UQFN-40 (5mm5mm) package temperature range of -40C to +125C. APPLICATIONS Hand-held devices for LED display Gaming device (Keyboard, Mouse etc.) LED in white goods application TYPICAL APPLICATION CIRCUIT 5V 5 PVCC 11 1 F 0.1 F SW11 22 40 VCC SW10 SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10SW11 1 F 0.1 F 51R CS18 V IO/MCU 4 20R 2k 2k SW2 CS17 6 28 SW1 20R SDA CS16 27 Micro SCL Controller IS31FL3743A 26 SDB 12 0.1 F 100k CS18 13 51R CS17 CS3 30 20R SYNC CS2 29 20R ISET 24 38 CS1 ADDR 2 CS2 RISET 25 39 10k ADDR 1 CS1 23 GND Figure 1 Typical Application Circuit: 66 RGBs Note 1: For the mobile applications the IC should be placed far away from the mobile antenna in order to prevent the EMI. Note 2: PVCC and VCC should use same power supply to avoid the additional I , it is OK to use PV =V =5V and V =3.3V. SD CC CC IO Lumissil Microsystems www.lumissil.com 1 Rev. A, 08/06/2018 IS31FL3743A TYPICAL APPLICATION CIRCUIT (CONTINUED) 5V 5 PVCC 11 1 F 0.1 F SW11 22 40 VCC SW10 SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10SW11 1 F 0.1 F 20R CS18 V IO/MCU 20R 4 2k 2k SW2 CS17 6 20R 28 SW1 SDA CS16 27 Micro SCL Controller IS31FL3743A 26 SDB 12 0.1 F 100k CS18 13 20R CS17 CS3 30 SYNC 20R CS2 29 ISET 20R 24 38 CS1 ADDR 2 CS2 R ISET 25 39 10k ADDR 1 CS1 23 GND Figure 2 Typical Application Circuit: 198 Mono Color LEDs VCC ADDR1 ADDR1 SDA ADDR1 SCL ADDR1 ADDR2 ADDR2 ADDR2 ADDR2 V IO 2k 2k SDA SDA SDA SDA SDA SDA SDA SDA SCL Micro SCL SCL SCL SCL SCL SCL SCL Controller SDB SDB SDB SDB SDB SDB SDB SDB 100k SYNC SYNC SYNC SYNC Master Slave 1 Slave 2 Slave 3 SYNC SYNC SYNC SYNC VCC VCC VCC VCC ADDR2 ADDR2 ADDR2 ADDR2 ADDR1 ADDR1 SDA ADDR1 SCL ADDR1 SDA SDA SDA SDA SDA SDA SDA SDA SCL SCL SCL SCL SCL SCL SCL SCL SDB SDB SDB SDB SDB SDB SDB SDB Slave 4 Slave 5 Slave 6 Slave 7 Figure 3 Typical Application Circuit (Eight Parts Synchronization-Work) Note 3: The 20R and 50R between LED and IC is only for thermal reduction, for mono red LED, if PV =V =3.3V, dont need these resistors. CC CC Note 4: One part is configured as master mode, all the other 7 parts configured as slave mode. Work as master mode or slave mode specified by Configuration Register (SYNC bits, register 25h, Page 2). Master part output master clock, and all the other parts which work as slave input this master clock. Lumissil Microsystems www.lumissil.com 2 Rev. A, 08/06/2018