IS31FL3205 12-CHANNEL LED DRIVER WITH 16-BIT PWM March 2020 GENERAL DESCRIPTION FEATURES The IS31FL3205 is an LED driver with 12 constant 2.7V to 5.5V supply current channels. Each channel can be pulse width Accuracy between channels and ICs: < 6% modulated (PWM) by 16 bits for smooth LED (Max.) brightness control. In addition, each channel has an 1MHz I2C interface, automatic address increment 8-bit output current control register which allows fine function with readout function tuning the current for rich RGB color mixing, e.g., a Four selectable I2C addresses pure white color LED application. The maximum output Accurate color rendition current of each channel can be adjusted by one 8-bit - Selectable 8-bit/10-bit/12-bit/16-bit PWM global control register. - 8-bit dot correction Proprietary programmable algorithms are used in - 8-bit global current adjust IS31FL3205 to minimize audible noise caused by the Open/Short detect function MLCC decoupling capacitor. All registers can be 62kHz PWM frequency (8-bit PWM) programmed via a high speed I2C (1MHz). Temperature detect function IS31FL3205 can be turned off with minimum current EMI reduction technology consumption by either pulling the SDB pin low or by - Spread spectrum using the software shutdown feature. - Selectable Phase Delay IS31FL3205 is available in QFN-20 (3mm 3mm) - Selectable 180 degree Clock Phase package. It operates from 2.7V to 5.5V over the -40C to +125C temperature range temperature range of -40C to +125C. QFN-20 (3mm3mm) package APPLICATIONS Hand-held devices for LED display AI-speakers and smart home devices LED in home appliances TYPICAL APPLICATION CIRCUIT *Note 1 V =V CC Battery 2 *Note 1 VCC V =V LED+ Battery 1F0.1 F 7 OUT1 *Note 2 V 8 IH OUT2 2k 2k 9 OUT3 5 SDA 6 Micro SCL Controller 0.1 F 20 IS31FL3205 SDB 100k 17 OUT10 *Note 3 4 18 ISET OUT11 R ISET 19 3.3k 1 OUT12 AD 3,13 GND Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 1 Rev. A, 02/27/2020 IS31FL3205 TYPICAL APPLICATION CIRCUIT (CONTINUED) *Note 1 *Note 4 *Note 1 5V 2 5V 33 VCC 7 OUT1 1F0.1 F 91 8 OUT2 *Note 2 V IH 33 9 OUT3 2k 2k 5 SDA 6 Micro SCL Controller 0.1 F20 IS31FL3205 SDB 33 17 100k OUT10 91 18 *Note 3 OUT11 4 33 ISET 19 OUT12 R ISET 3.3k 1 AD 3,13 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 IS31FL3205, 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 IS31FL3205. Note 5: The maximum output current is set to 38.25mA when R = 2k . 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