IS31FL3743A
Integrated Silicon Solution, Inc. – www.issi.com 1
Rev. 00D, 04/20/2018
18 × 11 DOTS MATRIX LED DRIVER
Advance Information
May 2018
GENERAL DESCRIPTION
The IS31FL3743A is a general purpose 18×n (n=1~11)
LED Matrix programmed via 1MHz I2C compatible
interface. Each LED can be dimmed individually with
8-bit PWM dat a 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, IS31FL3743A 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.
The IS31FL3743A operates from 2.7V to 5.5V and
features a very low shutdown and operational current.
IS31FL3743A is available in UQFN-40 (5mm×5mm)
package. It operates from 2.7V to 5.5V over the
temperature range of -40°C to +125° C.
FEATURES
Supply voltage range: 2.7V to 5.5V
18 current sinks
Support 18×n (n=1~11) LED matrix configurations
Individual 256 PWM control step s
Individual 256 DC current steps
Global 256 DC current step s
SDB rising edge reset I2C module
Programmable H/L logic: 1.4V/0.4V, 2.4V/0.6V
24kHz PWM frequency
1MHz I2C-compatible interface
State lookup registers
Individual open and short error detect function
180 degree phase delay operatio n to reduce
power noise
De-Ghost
Cascade for synchronization of chips
UQFN-40 (5mm×5mm) package
APPLICATIONS
Mobile phones and other hand-held devices for
LED display
Gaming device (Keyboard, Mouse etc.)
LED in white goods application
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit: 66 RGBs
Note 1: For the mobile applications the IC should be placed far away from the mobile antenna in order to prevent the EMI.
Note 2: PVCC and VCC should use same power supply to avoid the additional ISD, it is OK to use PVCC=VCC=5V and VIO=3.3V.
Note 3: The 20R and 50R between LED and IC is only for thermal reduction.
IS31FL3743A
Integrated Silicon Solution, Inc. – www.issi.com 2
Rev. 00D, 04/20/2018
TYPICAL APPLICATION CIRCUIT (CONTINUED)
Figure 2 Typical Application Circuit: 198 mono color LEDs
Figure 3 Typical Application Circuit (Eight Parts Synchronization-Work)
Note 4: One part is configured as master mode, all the other 7 parts configured as slave mode. Work as master mode or slave mode specified
by Configuration Register (SYNC bits, register 25h, Page 2). Master part output master clock, and all the other parts which work as slave input
this master clock.