IS31FL3728 Datasheet, PDF (1/12 Pages) Integrated Silicon Solution, Inc – AUDIO MODULATED MATRIX LED DRIVER

IS31FL3728
AUDIO MODULATED MATRIX LED DRIVER
GENERAL DESCRIPTION
FEATURES
December 2011
IS31FL3728 is a general purpose 8×8 LED matrix
driver which features an audio frequency equalizer
(EQ) mode or a general LED dot matrix display mode.
The general LED matrix display defaults to an 8×8
configuration, however, it can be configured for a 5×11,
6×10, 7×9 dot matrix display. The matrix picture
brightness can be modulated by audio. In either the
audio EQ mode or matrix display mode, the array is
internally scanned, and requires only one-time
programming, thus eliminating the need for real time
system resource utilization.
It programs the LED array through I2C interface. In
the general purpose display mode, each dot of the
LED array is independently programmed on or off over
time. In the audio EQ mode, the X axis (column)
represents the frequency bands while the Y axis (row)
represents the strength of the input audio signal in
each band. The number of LEDs lit in a column is
proportional to the strength of the audio signal in the
corresponding band in a thermometer-coded manner.
IS31FL3728 is available in 24-pin QFN (4mm × 4mm).
It operates from 2.7V to 5.5V over the temperature
range of -40°C to +85°C.
 5~8 current source outputs for row control
 8~11 outputs for column scan control
 Programmable 8×8, 7×9, 6×10, 5×11 matrix
 One-time programming, internal scan
 Full scale LED current controlled by internal
register setting or audio signal
 Audio frequency EQ display with programmable
input gain
 LED matrix brightness can be modulated with
audio Signal
 One address pin with 4 logic levels to allow four
I2C slave addresses
 I2C interface
 2.7V to 5.5V supply
 Over-temperature protection
 QFN-24 (4mm × 4mm) package
APPLICATIONS
 Mobile phones and other hand-held devices for
LED displays.
 Audio frequency equalizer display
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.A, 12/19/2011