IS31FL3743B 1811 DOTS MATRIX LED DRIVER WITH 12MHZ SPI May 2019 GENERAL DESCRIPTION FEATURES The IS31FL3743B is a general purpose 18n (n=1~11) Supply voltage range: 2.7V to 5.5V LED Matrix programmed via 12MHz SPI interface. 18 current sinks (Maximum) Each LED can be dimmed individually with 8-bit PWM Support 18n (n=1~11) LED matrix configurations data and 8-bit DC scaling data which allowing 256 Individual 256 PWM control steps steps of linear PWM dimming and 256 steps of DC Individual 256 DC current steps current adjustable level. Global 256 DC current steps Additionally each LED open state can be detected, SDB rising edge reset SPI module IS31FL3743B store the open information in Open- 29kHz PWM frequency Registers. The Open Registers allowing MCU to read 12MHz SPI interface out via SPI, inform MCU whether there are LEDs open or short LEDs. State lookup registers Individual open and short error detect function The IS31FL3743B operates from 2.7V to 5.5V and 180 degree phase delay operation to reduce features a very low shutdown and operational current. power noise IS31FL3743B is available in UQFN-40 (5mm5mm) De-ghost package. It operates from 2.7V to 5.5V over the Cascade for synchronization of chips temperature range of -40C to +125C. UQFN-40 (5mm5mm) package APPLICATIONS Hand-held devices for LED display Gaming device (Keyboard, Mouse etc.) LED in white goods application TYPICAL APPLICATION CIRCUIT 5V 1 F 0.1 F 5 PVCC 11 SW11 5V 40 22 SW10 VCC SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10SW11 1 F 0.1 F 51R CS18 4 28 SW2 20R MOSI 6 CS17 27 SW1 SCK 20R 25 CS16 Micro CS Controller 24 IS31FL3743B MISO 26 12 SDB CS18 13 CS17 51R 100k 0.1 F CS3 20R 30 CS2 SYNC 38 20R 29 CS2 CS1 ISET 39 CS1 10k 23 16 GND PGND 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, 05/13/2019 IS31FL3743B TYPICAL APPLICATION CIRCUIT (CONTINUED) 5V 1 F 0.1 F 5 PVCC 11 SW11 5V 40 22 SW10 VCC SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10SW11 1 F 0.1 F 20R CS18 4 28 SW2 20R MOSI 6 CS17 27 SW1 SCK 20R 25 CS16 Micro CS Controller 24 IS31FL3743B MISO 26 12 SDB CS18 13 20R CS17 100k 0.1 F CS3 20R 30 CS2 SYNC 38 20R 29 CS2 CS1 ISET 39 CS1 10k 23 16 GND PGND Figure 2 Typical Application Circuit: 198 Mono Color LEDs Figure 2 Typical Application Circuit (Eight Parts Synchronization-Work) Note 3: The 20R 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 (slaves should be configured as slave before master set as master). 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, 05/13/2019