18-CHANNEL LED DRIVER EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – ams.issi.com
1
Rev. B, 12/28/2018
DESCRIPTION
IS31FL3238 is an LED driver with 18 constant current
channels. Each channel can be pulse width modulated
(PWM) by 16 bits for smooth LED brightness control.
In addition, each channel has an 8-bit output current
control register which allows fine tuning the current for
rich RGB color mixing, e.g., a pure white color LED
application. The maximum output current of each
channel is designed to be 76mA, which can be
adjusted by one 8-bit global control register.
Proprietary programmable algorithms are used in
IS31FL3238 to minimize audible noise caused by the
MLCC decoupling capacitor. All registers can be
programmed via a high speed I2C (1MHz).
FEATURES
2.7V to 5.5V VCC supply
Modulate LED brightness with
256/1024/4096/65536 steps PWM method
Modulate LED DC current with 256 steps method
Global 256 steps analog global current control
PWM frequency selectable
Open short detect function
Spread
spectrum
QFN-28
(5mm×5mm)
packages
QUICK START
Figure 1: Photo of IS31FL3238
-
QWLS4 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 IS31FL3238 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) If using external DC power supply connect the
ground terminal of the power supply to the
evaluation board's GND pin and the positive
terminal to the VCC pin. The evaluation board can
also be powered via the Micro USB connector.
2) Short JP1 to disable external control.
3) Turn on the power supply/Plug in the Micro USB
and pay attention to the supply current. If the
current exceeds 1A, please check for circuit fault.
4) Enter the desired mode of display by toggling the
MODE button (K1).
ORDERING INFORMATION
Part No.
Temperature Range
Package
IS31FL3238-QFLS4-EB
-40°C to +125°C (Industrial)
QFN-28, Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
analog@issi.com
or (408) 969-6600.
