IS31FL3207 18-CHANNEL LED DRIVER WITH 16-BIT PWM March 2020 GENERAL DESCRIPTION FEATURES The IS31FL3207 is an LED driver with 18 constant 2.7V to 5.5V supply current channels. Each channel can be pulse width Pin to pin with IS31FL3208A (QFN-28, modulated (PWM) by 16 bits for smooth LED 4mm4mm) brightness control. In addition, each channel has an Accuracy between channels and ICs: 6% 8-bit output current control register which allows fine 1MHz I2C interface, automatic address increment tuning the current for rich RGB color mixing, e.g., a function with readout function pure white color LED application. The maximum output Four selectable I2C addresses current of each channel can be adjusted by one 8-bit Accurate color rendition global control register. - Selectable 8-bit/10-bit/12-bit/16-bit PWM Proprietary programmable algorithms are used in - 8-bit dot correction IS31FL3207 to minimize audible noise caused by the - 8-bit global current adjust MLCC decoupling capacitor. All registers can be Open/Short detect function programmed via a high speed I2C (1MHz). 62kHz PWM frequency (8-bit PWM) IS31FL3207 can be turned off with minimum current Temperature detect function consumption by either pulling the SDB pin low or by EMI reduction technology using the software shutdown feature. - Spread spectrum IS31FL3207 is available in QFN-28 (4mm 4mm) - Selectable Phase Delay package. It operates from 2.7V to 5.5V over the - Selectable 180 degree Clock Phase temperature range of -40C to +125C. -40C to +125C temperature range QFN-28 (4mm 4mm) package 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 (V = Battery) CC Lumissil Microsystems www.lumissil.com 1 Rev. A, 02/27/2020 IS31FL3207 TYPICAL APPLICATION CIRCUIT (CONTINUED) *Note 1 *Note 4 *Note 1 V =5V CC 3 V =5V LED+ 33 VCC 8 OUT1 1F0.1 F 91 9 OUT2 *Note 2 V IH 33 10 OUT3 2k 2k 6 SDA 7 Micro SCL Controller 0.1 F 1 IS31FL3207 SDB 33 26 100k OUT16 91 27 *Note 3 OUT17 5 33 ISET 28 OUT18 R ISET 3.3k 2 AD 4,11 18,25 GND GND Figure 2 Typical Application Circuit (V = 5V) CC Note 1: V should be same as VCC voltage. LED+ Note 2: V is the high level voltage for IS31FL3207, which is usually same as V of Micro Controller, e.g. if V of Micro Controller is 3.3V, IH CC CC V =3.3V. If V =5V and V is lower than 2.8V, recommend to add a level shift circuit for SDA and SCL. IH CC IH Note 3: A 0.1F capacitor is necessary for passing the EFT test. 2 Note 4: These optional resistors are for offloading the thermal dissipation (P=I R) away from the IS31FL3207. Note 5: The maximum global output current is set up to 23mA when R = 3.3k . The maximum global output current can be set by external ISET resistor, R . Please refer to the detail application information in R section. ISET ISET Note 6: The IC and LED should be placed far away from the antenna in order to prevent the EMI. Lumissil Microsystems www.lumissil.com 2 Rev. A, 02/27/2020