IS31FL3206 12-CHANNEL LED DRIVER SELECTABLE PWM FREQUENCY September 2019 GENERAL DESCRIPTION FEATURES IS31FL3206 is comprised of 12 constant current 2.7V to 5.5V supply channels each with independent PWM control, Each channel output current up to 38mA designed for driving LEDs, PWM frequency can be Accuracy between channels and ICs: <6% 24kHz (default) or 3.6kHz. The output current of each (Max.) channel can be set at up to 38mA (Max.) by an external I2C interface, automatic address increment resistor and independently scaled by a factor of 1, function 11/12, 9/12 and 7/12. The average LED current of each Four selectable I2C addresses channel can be changed in 256 steps by changing the Internal reset register PWM duty cycle through an I2C interface. Modulate LED brightness with 256 steps PWM The chip can be turned off by pulling the SDB pin low or Each channel can be controlled independently by using the software shutdown feature to reduce Each channel can be scaled independently by 1, power consumption. 11/12, 9/12 and 7/12 IS31FL3206 is available in QFN-20 (3mm 3mm) PWM frequency selectable package. It operates from 2.7V to 5.5V over the - 24kHz (default) temperature range of -40C to +125C. - 3.6kHz -40C to +125C temperature range QFN-20 (3mm 3mm) package APPLICATIONS AI-speakers and smart home devices LED in home appliances LED display for hand-held devices TYPICAL APPLICATION CIRCUIT *Note 1 V Battery *Note 1 2 VCC V Battery 1F0.1 F 7 OUT1 *Note 2 V 8 IH OUT2 4.7k 4.7k 9 OUT3 5 SDA 6 Micro SCL Controller 20 0.1 F IS31FL3206 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 (V = Battery) CC Lumissil Microsystems www.lumissil.com 1 Rev. B, 08/26/2019 IS31FL3206 TYPICAL APPLICATION CIRCUIT(CONTINUED) *Note 1 5V 2 *Note 4 *Note 1 VCC 5V 33 1F0.1 F 7 OUT1 *Note 2 91 V 8 IH OUT2 4.7k 4.7k 33 9 OUT3 5 SDA 6 Micro SCL Controller 20 0.1 F IS31FL3206 SDB 100k 33 17 OUT10 *Note 3 91 4 18 ISET OUT11 R ISET 33 19 3.3k 1 OUT12 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 IS31FL3206, 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. Note 4: These resistors are optional to help reduce the power of IS31FL3206 only (values are for V =5V). LED+ Note 5: The maximum output current is set to 38mA when R = 2k . Please refer to current setting section in application information. ISET Note 6: The IC should be placed far away from the antenna in order to prevent the EMI. Lumissil Microsystems www.lumissil.com 2 Rev. B, 08/26/2019