IS31FL3731C Datasheet, PDF (1/22 Pages) Integrated Silicon Solution, Inc – AUDIO MODULATED MATRIX LED DRIVER

IS31FL3731C
AUDIO MODULATED MATRIX LED DRIVER
GENERAL DESCRIPTION
The IS31FL3731C is a compact LED driver for 144
single LEDs. The device can be programmed via an
I2C compatible interface. The high logic (0.77V_CC) and
low logic (0.2V_CC) control threshold are specially
designed for white goods and industry application to
minimize the impact by the EMC noise. The
IS31FL3731C 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.
IS31FL3731C 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.
April 2014
FEATURES
 Supply voltage range: 2.7V to 5.5V
 400kHz I2C-compatible interface
 0.77V_CC threshold logic high control
 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
 White goods LED application
 Home, medical, industrial LED appliances
TYPICAL APPLICATION CIRCUIT
Micro
Controller
VBattery
1F
2
VCC
0.1 F
VDD
4.7k 4.7k 4.7k
100k
19
SDA
20
SCL
4
INTB
3
SDB _IS31FL3731C
Audio In
17
IN
0.22 F
6
R_EXT
16
REXT
20k
0.1 F
C_FILT
18
AD
5
GND
21
CA1
22
CA2
23
CA3
24
CA4
25
CA5
26
CA6
27
CA7
28
CA8
1
CA9
7
CB1
8
CB2
9
CB3
10
CB4
11
CB5
12
CB6
13
CB7
14
CB8
15
CB9
CA1
CA2
CA3
CA4
CA5
CA6
CA7
CA8
CA9
Matrix A
Matrix B
C1-1 C1-2 C1-3 C1-4 C1-5 C1-6 C1-7 C1-8
C1-9 C1-10 C1-11 C1-12 C1-13 C1-14 C1-15 C1-16
C2-1 C2-2 C2-3 C2-4 C2-5 C2-6 C2-7 C2-8
C2-9 C2-10 C2-11 C2-12 C2-13 C2-14 C2-15 C2-16
C3-1 C3-2 C3-3 C3-4 C3-5 C3-6 C3-7 C3-8
C3-9 C3-10 C3-11 C3-12 C3-13 C3-14 C3-15 C3-16
C4-1 C4-2 C4-3 C4-4 C4-5 C4-6 C4-7 C4-8
C4-9 C4-10 C4-11 C4-12 C4-13 C4-14 C4-15 C4-16
C5-1 C5-2 C5-3 C5-4 C5-5 C5-6 C5-7 C5-8
C5-9 C5-10 C5-11 C5-12 C5-13 C5-14 C5-15 C5-16
C6-1 C6-2 C6-3 C6-4 C6-5 C6-6 C6-7 C6-8
C6-9 C6-10 C6-11 C6-12 C6-13 C6-14 C6-15 C6-16
C7-1 C7-2 C7-3 C7-4 C7-5 C7-6 C7-7 C7-8
C7-9 C7-10 C7-11 C7-12 C7-13 C7-14 C7-15 C7-16
C8-1 C8-2 C8-3 C8-4 C8-5 C8-6 C8-7 C8-8
C8-9 C8-10 C8-11 C8-12 C8-13 C8-14 C8-15 C8-16
C9-1 C9-2 C9-3 C9-4 C9-5 C9-6 C9-7 C9-8
C9-9 C9-10 C9-11 C9-12 C9-13 C9-14 C9-15 C9-16
Figure 1 Typical Application Circuit
CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB8
CB9
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 R_EXT = 20kΩ. The LED current can be modulated by the R_EXT. Please refer to the
detail information in Page 18.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. B, 04/01/2014