IS31FL3235 28 CHANNELS LED DRIVER July 2017 GENERAL DESCRIPTION FEATURES IS31FL3235 is comprised of 28 constant current 2.7V to 5.5V supply channels each with independent PWM control, I2C interface, automatic address increment designed for driving LEDs. The output current of each function channel can be set at up to 38mA (Max.) by an external Internal reset register resistor and independently scaled by a factor of 1, 1/2, Modulate LED brightness with 256 steps PWM 1/3 and 1/4. The average LED current of each channel Each channel can be controlled independently can be changed in 256 steps by changing the PWM Each channel can be scaled independently by 1, duty cycle through an I2C interface. 1/2, 1/3 and 1/4 The chip can be turned off by pulling the SDB pin low or ESD HBM 8kV by using the software shutdown feature to reduce -40C to +85C temperature range power consumption. QFN-36 (4mm 4mm) package IS31FL3235 is available in QFN-36 (4mm 4mm) APPLICATIONS package. It operates from 2.7V to 5.5V over the temperature range of -40C to +85C. Mobile phones and other hand-held devices for LED display LED in home appliances TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Note 1: The maximum global output current is set up to 23mA when R = 3.3k . The maximum global output current can be set by external EXT resistor, R . Please refer to the detail information in Page 10. EXT Note 2: The IC should be placed far away from the mobile antenna in order to prevent the EMI. Lumissil Microsystems www.lumissil.com 1 Rev. D, 06/16/2017 IS31FL3235 PIN CONFIGURATION Package Pin Configuration (Top View) OUT2 1 27 OUT27 OUT3 2 26 OUT26 OUT4 3 25 OUT25 OUT5 4 24 OUT24 QFN-36 OUT6 5 23 OUT23 OUT7 6 22 OUT22 OUT8 7 21 OUT21 OUT9 8 20 OUT20 OUT10 9 19 OUT19 PIN DESCRIPTION No. Pin Description 1 ~ 13 OUT2 ~ OUT14 Output channel 2~14 for LEDs. 1432 GND Ground. 15 ~ 28 OUT15 ~ OUT28 Output channel 15~28 for LEDs. 29 SDB Shutdown the chip when pulled low. 30 AD I2C address setting. 31 VCC Power supply. Input terminal used to connect an external resistor. 33 R EXT This regulates the global output current. 34 SDA I2C serial data. 35 SCL I2C serial clock. 36 OUT1 Output channel 1 for LEDs. Thermal Pad Connect to GND. Lumissil Microsystems www.lumissil.com 2 Rev. D, 06/16/2017 OUT11 10 36 OUT1 OUT12 11 35 SCL OUT13 12 34 SDA OUT14 13 33 R EXT GND 14 32 GND OUT15 15 31 VCC OUT16 16 30 AD OUT17 17 29 SDB OUT18 18 28 OUT28