12×8 DOTS MATRIX LED DRIVER
DESCRIPTION
The IS31FL3736 is a general purpose 12×8 LEDs
matrix driver with 1/12 cycle rate. The device can be
programmed via an I2C compatible interface. Each
LED can be dimmed individually with 8-bit PWM data
which allowing 256 steps of linear dimming.
IS31FL3736 features 3 Auto Breathing Modes which
are noted as ABM-1, ABM-2 and ABM-3. For each Auto
Breathing Mode, there are 4 timing characters which
include current rising / holding / falling / off time and 3
loop characters which include Loop-Beginning /
Loop-Ending / Loop-Times. Every LED can be
configured to be any Auto Breathing Mode or PWM
mode individually.
FEATURES








Supply voltage range from 2.7V to 5.5V
Programmable 12×8 (32 RGBs) matrix size with
de-ghost function
3 Auto Breath Modes and PWM Mode
Auto breath offers 128 steps gamma current,
interrupt and state look up registers
256 steps global current setting
Individual PWM control 256 steps
Individual open and short error detect function
QFN-40 (5mm×5mm)
RECOMMENDED EQUIPMENT

5.0V, 2A power supply
ABSOLUTE MAXIMUM RATINGS

≤ 5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
PROCEDURE
The IS31FL3736 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)
2)
3)
4)
Short J3 to connect 3VO and VIO.
Short J4 to connect PVCC and U1VCC.
Connect the 5VDC power to the connector
(J1&J2).
Turn on the power supply/Plug in the Micro USB
Pay attention to the supply current. If the current
exceeds 1A, please check for circuit fault.
QUICK START
Figure 1: Photo of IS31FL3736 Evaluation Board
ORDERING INFORMATION
Part No.
IS31FL3736-QFLS4-EB
Temperature Range
-40°C to +125°C (Industrial)
Table 1: Ordering Information
Package
QFN-40, Lead-free
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
analog@issi.com or (408) 969-6600.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
1
12×8 DOTS MATRIX LED DRIVER
EVALUATION BOARD OPERATION
The IS31FL3736 evaluation board has three
animation display modes. Press K1 to switch
configurations.
1) Line-shaded animation
2) Heart animation
3) Dot-shaded line animation
4) All led turn on
Note: IS31FL3736 solely controls the FxLED function on the
evaluation board.
SOFTWARE CONTROL
J4 default setting is closed (short). If it is set to open,
the U1 (LDO) will stop working and all the 3V, including
the supply of MCU will be cut off, all the MCU's IO will
be high impedance (open-drain) and external control is
allowed.
The IS31FL3736 can set its I2C bus interface logic
threshold based on the voltage on the VIO pin. An
external VIO voltage in the range of 1.8V≤VIO≤VCC
can be applied after removing (open) the J4 jumper.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
The board comes with J4 default setting closed
(short). If it is set to open, the user can connect an
external VIO voltage supply, the external VIO voltage
is recommended to equal to ex-IIC’s high logic.
Follow the steps listed below for external control.
1)
2)
3)
4)
5)
6)
Open J4 to disconnect the power of U1, disable
the 3V0 (3.0V).
Open J3 to disconnect the VIO to 3V0, and
connect an external MCU VCC to VIO.
Pull-up the SDB to VIO.
Connect the 5VDC power to the connector
(J1&J2).
Turn on the power supply/Plug in the Micro USB
Pay attention to the supply current. If the current
exceeds 1A, please check for circuit fault.
Start external IIC control.
Caution: If J4 is closed (shorted), user can’t connect the user’s
MCU VCC to VIO directly, otherwise the user’s MCU (maybe 1.8V)
will connect to evaluation bard’s VIO (3.0V) and maybe
damaged.
Please refer to the datasheet to get more information about
IS31FL3736.
2
12×8 DOTS MATRIX LED DRIVER
MCU
PVCC
C4
10uF
GND
1SW1
1SW2
1SW3
GND
1SW4
1SW5
1SW6
1SW7
1SW8
1SW9
GND
1SW10
1SW11
1SW12
CS1
CS2
VCC
CS3
CS4
C8
0.1uF
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3V
SW1
SW2
SW3
PGND
SW4
SW5
SW6
SW7
SW8
SW9
PGND
SW10
SW11
SW12
CS1
CS2
PVCC
CS3
CS4
NC
GND
IICRS
SDB
INTB
ADDR2
ADDR1
SCL
SDA
SYNC
VIO
RSET
NC
AVCC
DVCC
AGND
CS8
CS7
PVCC
CS6
CS5
IS3736
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GND
IICRS
SDB
INTB
1ADDR1
SDB
M-SCL
M-SDA
GND
SYNC
VIO
1RESET
VCC
VCC
GND
CS8
CS7
VCC
CS6
CS5
1
2
3
4
OSC_IN 5
OSC_OUT 6
7
GND
8
3V
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
3V
24
R11 R9
R7 GND
100K 100K 100K
R10
NC
R5
20K
C10
C11
0.1uF
C9
GND
0.1uF
U3
R1
10K
k1
0.1uF
GND
C5
1uF
U2
VBAT
VDD_3
PC13-ANTI_TAMP
VSS_3
PC14-OSC32_IN
PB9/TIM4_CH4
PC15-OSC32_OUT
PB8/TIM4_CH3
OSC_IN
BOOT0
OSC_OUT
PB7/I2C1_SDA/TIM4_CH2
NRST
PB6/I2C1_SCL/TIM4_CH1
VSSA
PB5
VDDA
PB4/JNTRST
PA0-WKUP/ADC_IN0/TIM2_CH1_ETR
PB3/JTDO
PA1/ADC_IN1/TIM2_CH2
PA15/JTDI
PA2/USART2_TX/ADC_IN2/TIM2_CH3
PA14/JTCK/SWCLK
PA3/USART2_RX/ADC_IN3/TIM2_CH4
VDD_2
PA4/SPI1_NSS/ADC_IN4
VSS_2
PA5/SPI1_SCK/ADC_IN5
PA13/JTMS/SWDIO
PA6/SPI1_MISO/ADC_IN6/TIM3_CH1
PA12/CANTX/USBDP/TIM1_ETR
PA7/SPI1_MOSI/ADC_IN7/TIM3_CH2
PA11/CANRX/USBDM/TIM1_CH4
PB0/ADC_IN8/TIM3_CH3
PA10/USART1_RX/TIM1_CH3
PB1/ADC_IN9/TIM3_CH4
PA9/USART1_TX/TIM1_CH2
PB2/BOOT1
PA8/TIM1_CH1/MCO
PB10/I2C2_SCL/USART3_TX
PB15/SPI2_MOSI/TIM1_CH3N
PB11/I2C2_SDA/USART3_RX
PB14/SPI2_MISO/TIM1_CH2N
VSS_1
PB13/SPI2_SCK/TIM1_CH1N
VDD_1
PB12/SPI2_NSS/TIM1_BKIN
STM32F103C8T6
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
3V
GND
M-SDA
M-SCL
CLK
3V
GND
DIO
USB_DP
USB_DM
SDB
M-INTB
GND
OSC
3V Power
U1 VCC 1
C3
1uF
3
2
U1
VDD
SD
VOUT
LDO
GND
BP
3V
5
4
C2
C6
OSC_OUT
C1
1uF
OSC_IN
33P
Y1
8M
C7
33P
10nF
VIO
GND
GND
CLK
DIO
3.3V
IICRS
SYNC
INTB
SDA
SCL
AD1
AD1
GND
SCL
SDA
PVCC
VIO
SDB
GND
GND
GND
GND
M-SCL
M-INTB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Micro USB
VIO
M-SDA
CON3
R12
1K
USB_DM
SDA
USB_DP
R6
1K
3.3V
SCL
R8
100K
R3
+5V
R4
USB_DM
USB_DP
22R
R2
22R
1.5K
1
2
3
4
5
CON4
1
2
J1
J2
PVCC
1
2
+5V
VIO
3V
GND
INTB
J3
1
2
Header 2H
D1
DFLS240
PVCC
U1 VCC
J4
1
2
Header 2H
LED Array
2CS 8
2CS 7
2CS 6
2CS 5
2CS 4
2CS 3
2CS 2
2CS 1
2SW12 LD89
LD90
LD91
LD92
LD93
LD94
LD95
LD96
2SW11 LD81
LD82
LD83
LD84
LD85
LD86
LD87
LD88
2SW10 LD73
LD74
LD75
LD76
LD77
LD78
LD79
LD80
2SW9
LD65
LD66
LD67
LD68
LD69
LD70
LD71
LD72
2SW8
LD57
LD58
LD59
LD60
LD61
LD62
LD63
LD64
2SW7
LD49
LD50
LD51
LD52
LD53
LD54
LD55
LD56
2SW6
LD41
LD42
LD43
LD44
LD45
LD46
LD47
LD48
2SW5
LD33
LD34
LD35
LD36
LD37
LD38
LD39
LD40
2SW4
LD25
LD26
LD27
LD28
LD29
LD30
LD31
LD32
2SW3
LD17
LD18
LD19
LD20
LD21
LD22
LD23
LD24
2SW2
LD9
LD10
LD11
LD12
LD13
LD14
LD15
LD16
2SW1
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LD8
Figure 2: IS31FL3736 Application Schematic
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
3
12×8 DOTS MATRIX LED DRIVER
BILL OF MATERIALS
Name
Symbol
MCU
U2
Diode
LD1~LD96
Crystal
Resistor
Y1
R1,R7,R8,
R9,R11
R11
R2,R4
Resistor
R5
LDO
LED Driver
Diode
Resistor
Resistor
Description
U1
Reduced voltage
U3
Matrix LED Driver
D1
Diode, SMD
R3
Microcontroller
HC-49S
RES,22R,1/16W,±5%,SMD
2
RES,100k,1/16W,±5%,SMD
Button
K1
1
DIODES
DFLS240
5
Yageo
RC0603JR-07100KL
RES,1.5k,1/16W,±5%,SMD
1
Yageo
RC0603JR-071K5L
2
Yageo
RES,20k,1/16W,±5%,SMD
C4
C8,C9,C10,
C11
IS31FL3736
JB
Capacitor
Capacitor
STM32F103C8T6
1
CAP,1µF,16V,±20%,SMD
C6,C7
ISSI
STM
Crystal, 8MHz
C1,C3,C5
Capacitor
1
1
SGM2019-3.3V
9-217/BHC-ZL1M2RY/3T
Capacitor
C2
SGMICRO
Everlight
RES,1k,1/16W,±5%,SMD
Capacitor
1
Part No.
96
R6,R12
R10
Supplier
Blue LED, SMD
Resistor
Resistor
Qty
NC
1
0
3
Yageo
Yageo
Yageo
RC0603JR-0722RL
RC0603JR-0720KL
RC0603JR-0701KL
CC0603KKX7R9BB105
CAP,10pF,16V,±20%,SMD
1
Yageo
CC0603KKX7R9BB100
CAP,33pF,16V,±20%,SMD
2
Yageo
CC0603KKX7R9BB330
Button
1
CAP,10uF,16V, ±20%,SMD
CAP,0.1µF,16V,±20%,SMD
1
3
Yageo
Yageo
CC0603KKX7R9BB106
CC0603KKX7R9BB104
Bill of Materials, refer to Figure 2 above.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
4
12×8 DOTS MATRIX LED DRIVER
Figure 3: Board Component Placement Guide - Top Layer
Figure 4: Board PCB Layout - Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
5
12×8 DOTS MATRIX LED DRIVER
Figure 5: Board Component Placement Guide - Bottom Layer
Figure 6: Board PCB Layout - Bottom Layer
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
6
12×8 DOTS MATRIX LED DRIVER
Figure 7: LED Board Component Placement Guide - Top Layer
Figure 8: LED Board PCB Layout - Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
7
12×8 DOTS MATRIX LED DRIVER
Figure 9: LED Board Component Placement Guide - Bottom Layer
Figure 10: LED Board PCB Layout - Bottom Layer
Copyright © 2016 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
8
12×8 DOTS MATRIX LED DRIVER
REVISION HISTORY
Revision
A
Initial release
Detail Information
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/26/2016
Date
2016.07.26
9