IS31FL3731-QFLS2-TR Datasheet, PDF (1/22 Pages) Integrated Silicon Solution, Inc – AUDIO MODULATED MATRIX LED DRIVER

IS31FL3731
AUDIO MODULATED MATRIX LED DRIVER
GENERAL DESCRIPTION
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.
May 2013
FEATURES
 Supply voltage range: 2.7V to 5.5V
 400kHz 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 (4mm × 4mm) and SSOP-28 package
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 REXT = 20kΩ. The LED current can be modulated by the REXT. Please refer to the
detail information in Page 18.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.D, 04/22/2013