IS31FL3726 16-Bit Color LED Driver With PWM Control Evaluation Board Guide
Description
The IS31FL3726 is comprised of constant-current
drivers designed for color LEDs. The output current
value can be set using an external resistor. The output
current value can be adjusted from 5mA to 60mA
through the external resistor.
As a result, all outputs will have virtually the same
current levels.
This driver incorporates 16-bit constant t-current
outputs, a 16-bit shift register, a 16-bit latch and a
16-bit AND-gate circuit.
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 IS31FL3726 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.
Features
•
•
•
•
•
•
Supply voltage range from 3.3V to 5.5V
Constant current range: 5mA to 60mA
Application output voltage:
≥0.4V
For anode-common LEDs
Serial and parallel data transfer rate: 20MHz (Max.
cascade connection)
Package: QFN-24(4mm x 4mm)
1)
Connect the ground terminal of the power supply
to the GND and the positive terminal to the VCC.
Or connect the DC power to the connector (DC
IN).
Turn on the power supply and pay attention to the
supply current. If the current exceeds 500mA,
please check for circuit fault.
Enter the desired mode of display by toggling the
MODE button.
2)
Quick Start
3)
Figure 1: Photo of IS31FL3726 Evaluation Board
Evaluation Board Ordering Information
Part No.
IC Package
IS31FL3726-QFLS2-EB QFN-24, Lead-free
Table1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing
team at
analog_mkt@issi.com
or (408) 969-6600.
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 07/12/2012
1
IS31FL3726 16-Bit Color LED Driver With PWM Control Evaluation Board Guide
Evaluation Board Operation
The IS31FL3726 evaluation board has two display
modes. Press MODE button to switch configurations.
1) (Default mode) Blue LEDs turn on and off one by
one from right to left.
2) Blue LEDs turn on from middle to two sides and trun
off from two sides to middle.
Software Control
JP1 default setting is close circuit. If it is set to open,
the on-board MCU will stop working. The serial
control signal pins are set to High Impedance.
External serial control signals can be connected to
TP3 to control the IS31FL3726 LED driver.
Please refer to the datasheet to get more information about
IS31FL3726.
*Note:
IS31FL3726 solely controls the FxLED function on the
evaluation board.
JP1
OPEN=EXT CTRL
1
20
19
18
10
8
7
3V
K1
MODE
R3
100K
U3
3V
P0.0/CMP2/KBI0
VDD
15
TP4
5
3V
P0.5
P0.4
RST
GND
P0.4
P0.5
LAT
CLK
S-IN
OE
RST
5
4
3
2
1
ICP
U1
VCC
3
C2
1uF
3V
R2
OE
100K
3V
1
3
2
VDD
SD
GND
LDO
BP
4
VOUT
5
C5
1uF
R1
2K
LAT
S-IN
CLK
C4
10nF
7
5
6
2
4
VDD
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
SERIAL-OUT
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
S-OUT
GND
LAT
CLK
S-IN
OE
S-OUT
TP3
1
2
3
4
5
6
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
VCC
9
6
3
2
P0.1/CIN2B/KBI1
P0.2/CIN2A/KBI2
VSS
P0.3/CIN1B/KBI3
P1.2/T0/SCL
P1.4/INT1
P3.0XTAL2/CLKOUT
P0.4/CIN1A/KBI4
P0.5/CMPREF/KBI5
P0.6/CMP1/KBI6
P0.7/T1/KBI7
P1.0/TXD
P1.3/INT0/SDA
P1.1/RXD
P1.5/RST
P3.1/XTAL1
P1.6
P1.7
LPC922
U2
17
16
14
13
12
11
4
24
VCC
CON1
DC IN
TP1
C1
10uF
TP2
C3
1uF
ENABLE
LATCH
SERIAL-IN
CLOCK
R-EXT
GND
IS31FL3726
Figure 2:IS31FL3726 Application Schematic
Bill of Materials
Name
LED Driver
LDO
MCU
Diodes
Resistor
Resistors
Capacitor
Capacitors
Capacitor
Button
Symbol
U1
U2
U3
D1~D16
R1
R2~R3
C1
C2,C3,C5
C4
K1
Description
16CH FxLED Driver
Low-dropout
Microcontroller
Diode, LED Blue, SMD
RES,2k,1/16W,±5%,SMD
RES,100k,1/16W,±5%,SMD
CAP,10µF,16V,±20%,SMD
CAP, 1µF,16V,±20%,SMD
CAP,10nF,16V,±20%,SMD
Button
SMD
Regulator
Qty
1
1
1
16
1
2
1
3
1
1
Supplier
ISSI
PAM
NXP
Everlight
Part No.
IS31FL3726
PAM3101
LPC922
19-217/BHC-ZL
1M2RY/3T
Table 2: Bill of Materials, refer to Figure 2 above.
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 07/12/2012
2
IS31FL3726 16-Bit Color LED Driver With PWM Control Evaluation Board Guide
0
0
6
5
4
3
2
1
1
2
2
2
2
1
1
2
0
2
0
Figure 3: Board Component Placement Guide -Top Layer
Figure 4: Board PCB Layout- Top Layer
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 07/12/2012
3
IS31FL3726 16-Bit Color LED Driver With PWM Control Evaluation Board Guide
0
0
6
5
4
3
2
1
1
2
2
2
2
1
1
2
0
2
0
Figure 5: Board Component Placement Guide -Bottom Layer
Figure 6: Board PCB Layout-Bottom Layer
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 07/12/2012
4
IS31FL3726 16-Bit Color LED Driver With PWM Control Evaluation Board Guide
Copyright © 2011 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
R1.0, 07/12/2012
5
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