18 CHANNELS LED DRIVER EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. A, 04/03/2018
DESCRIPTION
IS31FL3218 is comprised of 18 constant current
channels each with independent PWM control,
designed for driving LEDs. The output current of each
channel can be set at up to 38mA (Max.) by an
external resistor. The average LED current of each
channel can be changed in 256 steps by changing the
PWM duty cycle through an I2C interface.
The chip can be turned off by pulling the SDB pin low
or by using the software shutdown feature to reduce
power consumption. The slave address is fixed “1010
1000”.
FEATURES
2.7V to 5.5V supply
I2C interface, automatic address increment
function
Internal reset register
Modulate LED brightness with 256 steps PWM
Each channel can be controlled independently
-40°C to +85°C temperature range
QFN-24 (4mm × 4mm), SOP-24 packages
QUICK START
Figure 1: Photo of IS31FL3218 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 IS31FL3218 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 J1 to close 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
IS31FL3218-QFLS2-EB
-40°C to +85°C (Industrial) QFN-28,
Lead-free
Table 1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
or (408) 969-6600.