18×8 DOTS MATRIX LED DRIVER EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – ams.issi.com
1
Rev. A, 03/11/2019
DESCRIPTION
The IS31FL3745 is a general purpose 18×n (n=1~8)
LED Matrix programmed via 1MHz I2C compatible
interface. Each LED can be dimmed individually with
8-bit PWM data and 8-bit DC scaling data which
allowing 256 steps of linear PWM dimming and 256
steps of DC current adjustable level.
Additionally each LED open and short state can be
detected, IS31FL3745 store the open or short
information in Open-Short Registers. The Open-Short
Registers allowing MCU to read out via I2C compatible
interface. Inform MCU whether there are LEDs open or
short and the locations of open or short LEDs.
FEATURES
Supply voltage range: 2.7V to 5.5V
18 Current sink (Maximum)
Support 18 × n (n=1~8) LED matrix configurations
Individual 256 PWM control steps
Individual 256 DC current steps
Global 256 current setting
SDB rising edge reset I2C module
Programmable H/L logic:1.4/0.4, 2.4/0.6
29kHz PWM frequency
State lookup registers
Individual open and short error detect function
180 degree phase delay operation to reduce power
noise
De-Ghost
Cascade for synchronization of chips
QUICK START
Figure 1: Photo of IS31FL3745-CLS4 Evaluation Board
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 IS31FL3745 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) Short JP1 (OPEN=EXT CTRL) to enable the
control of on board MCU (default status).
2) Connect the 5V DC power to VCC / GND in CON4,
or plug in the USB power input to micro-USB
(CON5).
3) Turn on the power supply, pay attention to the
supply current. If the current exceeds 1A, please
check for circuit fault.
EVALUATION BOARD OPERATION
The IS31FL3745 evaluation board has six display
modes. Press MODE button to switch configurations.
1) (Default mode) Rainbow #1.
2) Rainbow #2.
3) Purple breath.
4) Change colors.
5) White.
Note: IS31FL3745 solely controls the FxLED function on the
evaluation board.
ORDERING INFORMATION
Part No.
Temperature Range
Package
IS31FL3745-CLS4-EB
-40°C to +125°C (Industrial)
WLCSP-36, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
or (408) 969-6600