2974 Adafruit

IS31FL3731 AUDIO MODULATED MATRIX LED DRIVER May 2013 GENERAL DESCRIPTION FEATURES The IS31FL3731 is a compact LED driver for 144 Supply voltage range: 2.7V to 5.5V single LEDs. The device can be programmed via an 400kHz I2C-compatible interface I2C compatible interface. The IS31FL3731 offers two 144 LEDs in dot matrix blocks each driving 72 LEDs with 1/9 cycle rate. The Individual blink control required lines to drive all 144 LEDs are reduced to 18 8 frames memory for animations by using the cross-plexing feature optimizing space on Picture mode and animation mode the PCB. Additionally each of the 144 LEDs can be dimmed individually with 8-bit allowing 256 steps of Auto intensity breathing during the switching of linear dimming. different frames LED frames displayed can be modulated with To reduce CPU usage up to 8 frames can be stored audio signal intensity with individual time delays between frames to play LED light intensity can be modulated with audio small animations automatically. LED frames can be signal intensity modulated with audio signal. QFN-28 (4mm 4mm) and SSOP-28 package IS31FL3731 is available in QFN-28 (4mm 4mm) and SSOP-28 package. It operates from 2.7V to 5.5V over the temperature range of -40C to +85C. APPLICATIONS 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 IC should be placed far away from the mobile antenna in order to prevent the EMI. Note 2: The average current of each LED is 3.2mA when R = 20k . The LED current can be modulated by the R . Please refer to the EXT EXT detail information in Page 18. Integrated Silicon Solution, Inc. www.issi.com 1 Rev.D, 04/22/2013 IS31FL3731 PIN CONFIGURATION Package Pin Configuration (Top View) QFN-28 SSOP-28 Integrated Silicon Solution, Inc. www.issi.com 2 Rev.D, 04/22/2013