IS31FL3731 Audio Modulated Matrix LED Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com
1
R1.0, 07/12/2012
Description
The IS31FL3731 is a compact LED driver for 144 single
LEDs. The device can be programmed via an I2C
compatible interface. 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.
Features
•
Supply voltage range from 2.7V to 5.5V
•
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) package
Quick Start
Recommended Equipment
•
5.0V, 2A power supply
•
Audio source( i.e. MP3 player, Notebook PC, etc)
•
8
Ω
speaker
Absolute Maximum Ratings
•
≤
5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
Procedure
The IS31FL3731 evaluation board is fully assembled
and tested. Follow the steps listed below to verify
board operation.
Caution: Do not turn on the power supply until all connections
are completed.
1)
Connect an 8
Ω
speaker to the “SPK” connector.
2)
Connect the audio source to the “AUDIO IN”
connector.
3)
Connect the DC power to the connector (DC IN).
4)
Turn on the power supply and pay attention to the
supply current. If the current exceeds 1A, please
check for circuit fault.
5)
Turn on the audio signal.
6)
Modulation of the audio signal utilized to obtain
better sound output performance
Figure 1: Photo of IS31FL3731 Evaluation Board
Evaluation Board Ordering Information
Part No.
IC Package
IS31FL3731-QFLS2-EB QFN-28, Lead-free
Table1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing
team at
or (408) 969-6600.
