IS31FL3238-QFLS4-TR ISSI

IS31FL3238 18-CHANNEL LED DRIVER July 2019 GENERAL DESCRIPTION FEATURES IS31FL3238 is an LED driver with 18 constant current 2.7V to 5.5V VCC supply channels. Each channel can be pulse width modulated 1MHz I2C interface, automatic address increment (PWM) by 16 bits for smooth LED brightness control. function with readout function In addition, each channel has an 8-bit output current Four selectable I2C addresses control register which allows fine tuning the current for Accurate color rendition rich RGB color mixing, e.g., a pure white color LED - Selectable 16-bit PWM 256/1024/4096/65536 application. The maximum output current of each - 8-bit dot correction channel is designed to be 78mA, which can be - 8-bit global current adjust adjusted by one 8-bit global control register. Proprietary programmable algorithms are used in Open/Short detect function IS31FL3238 to minimize audible noise caused by the 62kHz PWM frequency (8-bit PWM) MLCC decoupling capacitor. All registers can be Temperature detect function programmed via a high speed I2C (1MHz). EMI/noise reduction technology IS31FL3238 can be turned off with minimum current - Spread spectrum consumption by either pulling the SDB pin low or by - Selectable 6 phase delay using the software shutdown feature. - 180 degree phase delay -40C to +125C temperature range IS31FL3238 is available in QFN-28 (5mm5mm) package. It operates from 2.7V to 5.5V over the QFN-28 (5mm5mm) package temperature range of -40C to +125C. APPLICATIONS AI-speakers and smart home devices Hand-held devices for LED display LED in home appliances TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 1 Rev. A, 06/24/2019 IS31FL3238 Figure 2 Typical Application Circuit Note 1: V should be same as VCC voltage. LED+ Note 2: V is the high level voltage for IS31FL3238, which is usually same as VCC of Micro Controller, e.g. if VCC of Micro Controller is 3.3V, IH V =3.3V. If V =5V and V is lower than 2.8V, recommend to add a level shift circuit. IH CC IH Note 3: These resistors are optional to help reduce the power of IS31FL3238 only (values are for V =5V). LED+ Note 4: The output current is set up to 23mA when R = 6.8k . The maximum global output current can be set by external resistor, R . ISET ISET Please refer to the detail application information in R section. ISET Note 5: The IC should be placed far away from the antenna in order to prevent the EMI. Lumissil Microsystems www.lumissil.com 2 Rev. A, 06/24/2019