IS31FL3732A
AUDIO MODULATED MATRIX LED DRIVER
July 2017
GENERAL DESCRIPTION
The IS31FL3732A is a compact LED driver for 144
single LEDs. The device can be programmed via an
I2C compatible interface. The IS31FL3732A 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.
IS31FL3732A is available in QFN-40 (5mm×5mm)
package. It operates from 2.7V to 5.5V over the
temperature range of -40°C to +85°C.
FEATURES
Supply voltage range: 2.7V to 5.5V
1MHz I2C-compatible interface
144 LEDs in dot matrix
Individual blink control
Individual PWM control 256 steps
Individual on/off control
Global current control 256 steps
Cascade for synchronization of chips
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-40 (5mm×5mm) package
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
Mobile phones and other hand-held devices for
LED display
LED in home appliances
Figure 1
Typical Application Circuit
Note 1:
For the mobile applications 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
.
Note 3:
The thermal pad should be connected to GND.
Note 4:
The V
IO
should be 1.8V≤ V
IO
≤V
CC
. And it is recommended to be equal to V
OH
of the micro controller. For example, if V
OH
=1.8V, set
V
IO
=1.8V is recommended.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 07/04/2017
1
IS31FL3732A
V
Battery
1,20
PVCC
VIO
27
V
IO
1 F 0.1 F
0.1 F 1 F
26
1 F 0.1 F
AVCC
CA1
VCC
CA2
CA3
CA4
CA5
32
33
34
35
36
37
38
39
40
11
12
13
14
15
16
17
18
19
4
1 F 0.1 F
A1
A2
A3
A4
A5
A6
A7
A8
A9
B1
B2
B3
B4
B5
B6
B7
B8
B9
A1
A2
A3
A4
A5
A6
A7
A8
A9
C1-1
C1-2
C1-3
Matrix A
Matrix B
B1
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
V
IO
100k
1k
1k
B2
B3
B4
B5
B6
B7
B8
B9
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
CA6
21
22
SDA
SCL
INTB
SDB
CA7
CA8
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
Micro
Controller
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
5
25
100k
IS31FL3732A
CA9
CB1
CB2
CB3
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
0.22 F
Audio In
6
CB4
IN
SYNC
R_EXT
C_FILT
ADDR1
ADDR2
GND
CB5
CB6
CB7
CB8
CB9
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
30
28
29
R
EXT
20k
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
24
0.1 F
23
7~9,31
V
Battery
23
1,20
ADDR2
PVCC
VIO
27
V
IO
0.1 F 1 F
1 F 0.1 F
26
1 F 0.1 F
AVCC
CA1
CA2
32
33
34
35
36
37
38
39
40
11
12
13
14
15
16
17
18
19
C1
C2
C3
C4
C5
C6
C7
C8
C9
D1
D2
D3
D4
D5
D6
D7
D8
D9
C1
C2
C3
C4
C5
C6
C7
C8
C9
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
4
1 F 0.1 F
VCC
CA3
CA4
CA5
CA6
CA7
Matrix C
Matrix D
D1
D2
D3
D4
D5
D6
D7
D8
D9
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
21
22
5
25
SDA
SCL
INTB
SDB
CA8
CA9
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
IS31FL3732A
CB1
CB2
CB3
CB4
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
0.22 F
Audio In
6
CB5
IN
SYNC
R_EXT
C_FILT
ADDR1
GND
CB6
CB7
CB8
CB9
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
30
28
R
EXT
20k
0.1 F
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
29
24
7~9,31
Figure 2
Typical Application Circuit (Two Parts Synchronization-Work)
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 07/04/2017
2
IS31FL3732A
V
Battery
ADDR1
V
IO
100k
1k
1k
ADDR1
ADDR2
SDA
ADDR1
ADDR2
SCL
ADDR1
ADDR2
ADDR2
SDA
SCL
Micro
Controller
INTB
SDB
100k
SDA
SCL
INTB
SDB
SDA
SCL
SDA
SCL
INTB
SDA
SCL
SDA
SCL
INTB
SDA
SCL
SDA
SCL
INTB
SDB
SDB
SDB
SDB
SDB
SDB
SYNC
Master
SYNC
Slave 1
SYNC
Slave 2
SYNC
Slave 3
V
Battery
SYNC
ADDR2
ADDR1
V
Battery
SYNC
ADDR2
ADDR1
V
Battery
SYNC
ADDR2
V
Battery
SYNC
ADDR2
SDA
ADDR1
SCL
ADDR1
SDA
SCL
SDA
SCL
INTB
SDA
SCL
SDA
SCL
INTB
SDA
SCL
SDA
SCL
INTB
SDA
SCL
SDA
SCL
INTB
SDB
SDB
Slave 4
SDB
SDB
Slave 5
SDB
SDB
Slave 6
SDB
SDB
Slave 7
Figure 3
Typical Application Circuit (Eight Parts Synchronization-Work)
Note 5:
One part is configured as master, all the other 7 parts configured as slave. Work as master or slave specified by Configuration
Register (Function register, 00h), and the detail described in Page 14. Master part output master clock, and all the other parts which work as
slave input this master clock.
The master clock is used for all parts which are connected synchronize Breath /Blink/ Auto Frame Play Mode
related timing spec.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 07/04/2017
3
IS31FL3732A
PIN CONFIGURATION
Package
Pin Configuration (Top View)
QFN-40
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 07/04/2017
4
IS31FL3732A
PIN DESCRIPTION
No.
1,20
2,3,10
4
5
6
7~9,31
11~19
21
22
23
24
25
26
27
28
29
30
32~40
Pin
PVCC
NC
VCC
INTB
IN
GND
CB1 ~ CB9
SDA
SCL
ADDR2
ADDR1
SDB
AVCC
VIO
R_EXT
C_FILT
SYNC
CA1 ~ CA9
Thermal Pad
Description
Power supply for internal power block.
Not connect.
Digital power supply
Interrupt output. Active low when movie end in Auto
Frame Play Mode. Detail information refers to Page 19.
Audio input.
Digital ground.
LED Matrix B current output/input port.
I2C compatible serial data.
I2C compatible serial clock.
I2C address 2 setting.
I2C address 1 setting.
Shutdown the chip when pull to low.
Analog power supply.
Input logic reference voltage.
Input terminal used to connect an external resistor.
This regulates the global output current. Detail
information refers to Page 18.
Filter capacitor for audio control.
Synchronize signal. It is used for more than one part
work synchronize. Detail information refers to Page 20.
If it is not used please float this pin.
LED Matrix A current output/input port.
Connect to GND.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 07/04/2017
5
