IS31FL3218 18 CHANNELS LED DRIVER September 2016 GENERAL DESCRIPTION FEATURES IS31FL3218 is comprised of 18 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. The average LED current of each channel can Modulate LED brightness with 256 steps PWM be changed in 256 steps by changing the PWM duty Each channel can be controlled independently cycle through an I2C interface. -40C to +85C temperature range The chip can be turned off by pulling the SDB pin low or QFN-24 (4mm 4mm), SOP-24 package by using the software shutdown feature to reduce power consumption. The slave address is fixed 1010 1000. APPLICATIONS IS31FL3218 is available in QFN-24 (4mm 4mm) and SOP-24. It operates from 2.7V to 5.5V over the Mobile phones and other hand-held devices for temperature range of -40C to +85C. LED display LED in home appliances TYPICAL APPLICATION CIRCUIT VBattery VBattery 7 3 OUT1 VCC 8 OUT2 1 F 0.1 F 9 OUT3 10 OUT4 11 OUT5 VDD 12 OUT6 13 OUT7 4.7k 4.7k 14 OUT8 IS31FL3218 5 15 SDA OUT9 6 16 Micro SCL OUT10 Controller 24 17 SDB OUT11 18 100k OUT12 19 OUT13 20 OUT14 21 2 OUT15 R EXT 22 OUT16 23 3.3k 4 OUT17 GND 1 OUT18 Figure 1 Typical Application Circuit Note: The maximum output current is set up to 23mA when R = 3.3k. The maximum output current can be set by external resistor, R . EXT EXT Please refer to the detail information in Page 9. Note: The IC should be placed far away from the mobile antenna in order to prevent the EMI. Integrated Silicon Solution, Inc. www.issi.com 1 Rev. D, 09/02/2016 IS31FL3218 PIN CONFIGURATION Package Pin Configuration (Top View) OUT18 1 18 OUT12 R EXT 2 17 OUT11 VCC 3 16 OUT10 QFN-24 GND 4 15 OUT9 SDA 5 14 OUT8 SCL 6 13 OUT7 OUT18 1 24 SDB R EXT 2 23 OUT17 VCC 3 22 OUT16 GND 4 21 OUT15 SDA 5 20 OUT14 SCL 6 19 OUT13 SOP-24 OUT1 7 18 OUT12 OUT2 8 17 OUT11 OUT3 9 16 OUT10 OUT4 10 15 OUT9 OUT5 11 14 OUT8 OUT6 12 13 OUT7 PIN DESCRIPTION No. Pin Description 1 OUT18 Output channel for LEDs. Input terminal used to connect an external resistor. 2 R EXT This regulates the output current. 3 VCC Power supply. 4 GND Ground. 5 SDA I2C serial data. 6 SCL I2C serial clock. 7~23 OUT1 ~ OUT17 Output channel for LEDs. 24 SDB Shutdown the chip when pulled low. Thermal Pad Connect to GND. Integrated Silicon Solution, Inc. www.issi.com 2 Rev. D, 09/02/2016 OUT1 7 24 SDB OUT2 8 23 OUT17 OUT3 9 22 OUT16 OUT4 10 21 OUT15 OUT5 11 20 OUT14 OUT6 12 19 OUT13