IS32FL3740 34 DOTS MATRIX LED DRIVER WITH INDIVIDUAL AUTO BREATH FUNCTION August 2018 GENERAL DESCRIPTION FEATURES The IS32FL3740 is a general purpose 34 LEDs Supply voltage range: 2.7V to 5.5V matrix driver with 1/12 cycle rate. The device can be 4 current source outputs for row control programmed via an I2C compatible interface. Each 3 switch current inputs for column scan control LED can be dimmed individually with 8-bit 8 PWM Up to 12 LEDs (34) in dot matrix data which allowing 1024 steps of linear dimming. Programmable 34 (4 RGBs) matrix size with de- IS32FL3740 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 offers128 steps gamma current, configured to be any Auto Breathing Mode or No- interrupt and state lookup registers Breathing Mode individually. 256 steps global current setting Additionally each LED open and short state can be Individual on/off control detected, IS32FL3740 store the open or short Individual 1024 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. eTSSOP-20 package The IS32FL3740 operates from 2.7V to 5.5V and AEC-Q100 Qualified features a very low shutdown and operational current. APPLICATIONS IS32FL3740 is available in eTSSOP-20 package. It Automotive clusters operates from 2.7V to 5.5V over the temperature Dashboards range of -40C to +125C. Automotive interiors TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit (34) Lumissil Microsystems www.lumissil.com 1 Rev. A, 08/07/2018 IS32FL3740 VBattery V IO/MCU *Note 2 17 20 PVCC VIO 22 F 0.47 F 0.1 F 0.47 F 10V 1 AVCC 0.47 F 0.1 F 19 CS4 V 18 MCU CS3 CS1 CS2 CS3 CS4 16 100k 2k 2k CS2 15 4 CS1 C SDA SW3 5 SCL B Micro IS32FL3740 7 SW2 Controller INTB 8 A SDB SW1 14 SW3 1234 100k 12 SW2 3 10 SYNC SW1 2 ISET RISET 6 20k ADDR 9 11,13 GND PGND 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 maybe considered for high current application to avoid audible noise interference. Note 3: 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. Note 4: The VIO should be 1.8V V V . And it is recommended to be equal to VOH of the micro controller. For example, if VOH=1.8V, set IO CC V =1.8V, if VOH=3.3V, set V =3.3V. IO IO Lumissil Microsystems www.lumissil.com 2 Rev. A, 08/07/2018