The IS31FL3731 is a compact LED driver for 144 single LEDs. The device can be programmed via an I2C compatible interface. The IS31FL3731 offers two blocks each driving 72 LEDs with 1/9 cycle rate. The required lines to drive all 144 LEDs are reduced to 18 by using the cross-plexing feature optimizing space on the PCB. Additionally each of the 144 LEDs can be dimmed individually with 8-bit allowing 256 steps of linear dimming.
To reduce CPU usage up to 8 frames can be stored with individual time delays between frames to play small animations automatically. LED frames can be modulated with audio signal.
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 -40°C to +85°C.
Supply voltage range: 2.7 V to 5.5 V
400 kHz I2C-compatible interface
144 LEDs in dot matrix
Individual blink control
8 frames memory for animations
Picture mode and animation mode
Auto intensity breathing during the switching of different frames
LED frames displayed can be modulated with audio signal intensity
LED light intensity can be modulated with audio signal intensity
QFN-28 (4 × 4 mm) and SSOP-28 package