IS31FL3728 AUDIO MODULATED MATRIX LED DRIVER June 2017 GENERAL DESCRIPTION FEATURES IS31FL3728 is a general purpose 88 LED matrix 5~8 current source outputs for row control driver which features an audio frequency equalizer 8~11 outputs for column scan control (EQ) mode or a general LED dot matrix display mode. Programmable 88, 79, 610, 511 matrix The general LED matrix display defaults to an 88 configuration, however, it can be configured for a 511, One-time programming, internal scan 610, 79 dot matrix display. The m atrix picture Full scale LED current controlled by internal brightness can be modulated by audio. In either the register setting or audio signal audio EQ mode or matrix display mode, the array is Audio frequency EQ display with programmable internally scanned, and requires only one-time input gain programming, thus eliminating the need for real time LED matrix brightness can be modulated with system resource utilization. audio Signal It programs the LED array through I2C interface. In One address pin with 4 logic levels to allow four the general purpose display mode, each dot of the I2C slave addresses LED array is independently programmed on or off over I2C interface time. In the audio EQ mode, the X axis (column) represents the frequency bands while the Y axis (row) 2.7V to 5.5V supply represents the strength of the input audio signal in Over-temperature protection each band. The number of LEDs lit in a column is QFN-24 (4mm 4mm) package proportional to the strength of the audio signal in the corresponding band in a thermometer-coded manner. APPLICATIONS IS31FL3728 is available in 24-pin QFN (4mm 4mm). Mobile phones and other hand-held devices for It operates from 2.7V to 5.5V over the temperature LED displays. range of -40C to +85C (IS31FL3728-QFLS2-TR), -40C to +105C (IS31FL3728-QFLS3-TR). Audio frequency equalizer display TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 1 Rev. C, 05/15/2017 IS31FL3728 PIN CONFIGURATION Package Pin Configuration (Top View) QFN-24 PIN DESCRIPTION No. Pin Description 1 SDA Serial data. 2 SCL Serial clock. 3 SDB Shutdown the chip when pull to low. 4 IN Audio input. 5 C FILT Low pass filter cap for audio control. 6 AD I2C Address setting. 7~10, 12 R1~R5 Current source outputs. 11 VCC Power supply. 13~15 R6/C11, R7/C10, R8/C9 CMOS outputs. 16~19,21~24 C8~C1 Current sink outputs. 20 GND Ground. Thermal Pad Connect to GND. Lumissil Microsystems www.lumissil.com 2 Rev. C, 05/15/2017