IS31FL3737A 1212 DOTS MATRIX LED DRIVER WITH INDIVIDUAL AUTO BREATH FUNCTION December 2018 GENERAL DESCRIPTION FEATURES The IS31FL3737A is a general purpose 1212 LEDs Supply voltage range: 2.7V to 5.5V matrix driver with 1/12 cycle rate. The device can be 12 current source outputs for row control programmed via an I2C compatible interface. Each 12 switch current inputs for column scan control LED can be dimmed individually with 8-bit PWM data Up to 144 LEDs (1212) in dot matrix which allowing 256 steps of linear dimming. Programmable 1212 (48 RGBs) matrix size with IS31FL3737A features 3 Auto Breathing Modes which de-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. 7.4kHz/25kHz PWM frequency option Additionally each LED open and short state can be 256 steps Global Current Setting detected, IS31FL3737A store the open or short Individual on/off control information in Open-Short Registers. The Open-Short Registers allowing MCU to read out via I2C Individual 256 PWM control steps compatible interface. Inform MCU whether there are Individual Auto Breath Mode select LEDs open or short and the locations of open or short Individual open and short error detect function LEDs. Cascade for synchronization of chips The IS31FL3737A operates from 2.7V to 5.5V and QFN-40 (5mm5mm) package features a very low shutdown and operational current. APPLICATIONS IS31FL3737A is available in QFN-40 (5mm5mm) Hand-held devices for LED display package. It operates from 2.7V to 5.5V over the Gaming device (Keyboard, Mouse etc.) temperature range of -40C to +125C. LED in white goods application TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit (1212) Lumissil Microsystems www.lumissil.com 1 Rev. A, 12/17/2018 IS31FL3737A TYPICAL APPLICATION CIRCUIT (CONTINUED) Figure 2 Typical Application Circuit (RGB) Figure 3 Typical Application Circuit (Four Parts Synchronization-Work) Note 1: IC should be placed far away from the antenna in order to prevent the EMI. Note 2: Electrolytic/Tantalum Capacitor may be considered for high current application to avoid audible noise interference. Note 3: 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, if V =3.3V, set V =3.3V. IO OH IO Note 4: One system should contain only one master, all slave parts should be configured as slave mode before the master is configured as master 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. Lumissil Microsystems www.lumissil.com 2 Rev. A, 12/17/2018