IS31FL3738 68 DOTS MATRIX LED DRIVER WITH INDIVIDUAL AUTO BREATH FUNCTION February 2018 GENERAL DESCRIPTION FEATURES The IS31FL3738 is a general purpose 68 LEDs Supply voltage range: 2.7V to 5.5V matrix driver with 1/12 cycle rate. The device can be 8 current source outputs for row control programmed via an I2C compatible interface. Each 6 switch current inputs for column scan control LED can be dimmed individually with 8-bit 4 PWM Up to 48 LEDs (68) in dot matrix data which allowing 512 steps of linear dimming. Programmable 68 (16 RGBs) matrix size with de- IS31FL3738 features 3 Auto Breathing Modes which ghost function are noted as ABM-1, ABM-2 and ABM-3. For each 1MHz I2C-compatible interface Auto Breathing Mode, there are 4 timing characters Selectable 3 Auto Breath Modes for each dot which include current rising / holding / falling / off time Auto Breath Loop Features interrupt pin inform and 3 loop characters which include Loop-Beginning / MCU Auto Breath Loop completed Loop-Ending / Loop-Times. Every LED can be Auto Breath offers 128 steps gamma current, configured to be any Auto Breathing Mode or No- interrupt and state look up registers Breathing Mode individually. 256 steps global current setting Additionally each LED open and short state can be Individual on/off control detected, IS31FL3738 store the open or short Individual 512 PWM control steps information in Open-Short Registers. The Open-Short Individual Auto Breath Mode select Registers allowing MCU to read out via I2C compatible interface. Inform MCU whether there are Individual open and short error detect function LEDs open or short and the locations of open or short Cascade for synchronization of chips LEDs. QFN-28 (5mm5mm) and eTSSOP-28 packages The IS31FL3738 operates from 2.7V to 5.5V and APPLICATIONS features a very low shutdown and operational current. Mobile phones and other hand-held devices for IS31FL3738 is available in QFN-28 (5mm5mm) and LED display eTSSOP-28 packages. It operates from 2.7V to 5.5V Gaming device (keyboard, mouse etc.) over the temperature range of -40C to +125C. LED in white goods application TYPICAL APPLICATION CIRCUIT VBattery VIO/MCU *Note 2 PVCC VIO 22 F 10V 0.47 F 0.1 F 0.47 F PVCC 0.47 F 0.1 F AVCC CS8 0.47 F 0.1 F CS7 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 V IO/MCU F SW6 100k 1k 1k CS2 E CS1 SW5 SDA IS31FL3738 D SCL SW4 Micro Controller INTB C SW6 SW3 SDB SW5 B SW2 100k A SW1 SYNC 123 456 78 SW2 R EXT SW1 REXT 20k ADDR GND PGND Figure 1 Typical Application Circuit (68) Integrated Silicon Solution, Inc. www.issi.com 1 Rev. C, 01/11/2018 IS31FL3738 TYPICAL APPLICATION CIRCUIT (CONTINUED) Figure 2 Typical Application Circuit (RGB) VBattery ADDR ADDR SDA ADDR SCL ADDR V IO 100k 1k 1k SDA SDA SDA SDA SDA SDA SDA SDA SCL SCL SCL SCL SCL SCL SCL SCL Micro INTB Controller INTB INTB INTB INTB SDB SDB SDB SDB SDB SDB SDB SDB 100k SYNC SYNC SYNC SYNC Master Slave 1 Slave 2 Slave 3 Figure 3 Typical Application Circuit (Four Parts Synchronization-Work) 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: Electrolytic/Tantalum Capacitor may considerable for high current application to avoid audible noise interference. Note 3: One part is configured as master mode, all the other 3 parts configured as slave mode. Work as master mode or slave mode specified by Configuration Register (Function Register, address 00h). Master part output master clock, and all the other parts which work as slave input this master clock. Note 4: The VIO should be 1.8V V V . And it is recommended to be equal to V of the micro controller. For example, if V =1.8V, set IO CC OH OH V =1.8V is recommended. IO Integrated Silicon Solution, Inc. www.issi.com 2 Rev. C, 01/11/2018