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IS31FL3731 Datasheet, PDF (1/22 Pages) Integrated Silicon Solution, Inc – AUDIO MODULATED MATRIX LED DRIVER | |||
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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 à 4mm) and
SSOP-28 package. It operates from 2.7V to 5.5V over
the temperature range of -40°C to +85°C.
September 2012
FEATURES
ï· Supply voltage range: 2.7V to 5.5V
ï· 400kHz I2C-compatible interface
ï· 144 LEDs in dot matrix
ï· Individual blink control
ï· 8 frames memory for animations
ï· Picture mode and animation mode
ï· Auto intensity breathing during the switching of
different frames
ï· LED frames displayed can be modulated with
audio signal intensity
ï· LED light intensity can be modulated with audio
signal intensity
ï· QFN-28 (4mm à 4mm) and SSOP-28 package
APPLICATIONS
ï· Mobile phones and other hand-held devices for
LED display
ï· 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 = 20kâ¦. The LED current can be modulated by the REXT. Please refer to the
detail information in Page 16.
Integrated Silicon Solution, Inc. â www.issi.com
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Rev.B, 09/10/2012
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