IS32FL3740
3×4 DOTS MATRIX LED DRIVER
WITH INDIVIDUAL AUTO BREATH FUNCTION
Preliminary Information
April 2017
GENERAL DESCRIPTION
The IS32FL3740 is a general purpose 3×4 LEDs
matrix driver with 1/12 cycle rate. The device can be
programmed via an I2C compatible interface. Each
LED can be dimmed individually with 8-bit × 8 PWM
data which allowing 1024 steps of linear dimming.
IS32FL3740 features 3 Auto Breathing Modes which
are noted as ABM-1, ABM-2 and ABM-3. For each
Auto Breathing Mode, there are 4 timing characters
which include current rising / holding / falling / off time
and 3 loop characters which include Loop-Beginning /
Loop-Ending / Loop-Times. Every LED can be
configured to be any Auto Breathing Mode or No-
Breathing Mode individually.
Additionally each LED open and short state can be
detected, IS32FL3740 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 IS32FL3740 operates from 2.7V to 5.5V and
features a very low shutdown and operational current.
IS32FL3740 is available in eTSSOP-20 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
4 current source outputs for row control
3switch current inputs for column scan control
Up to 12 LEDs (3×4) in dot matrix
Programmable 3×4 (4 RGBs) matrix size with de-
ghost function
1MHz I2C-compatible interface
Selectable 3 Auto Breath Modes for each dot
Auto breath loop features interrupt pin inform
MCU auto breath loop completed
Auto breath offers128 steps gamma current,
interrupt and state lookup registers
256 steps global current setting
Individual on/off control
Individual 1024 PWM control steps
Individual Auto Breath Mode select
Individual open and short error detect function
Cascade for synchronization of chips
eTSSOP-20 package
APPLICATIONS
Mobile phones and other hand-held devices for
LED display
Gaming device (Keyboard, Mouse etc.)
LED in white goods application
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0B, 04/12/2017
1
IS32FL3740
PIN CONFIGURATION
Package
Pin Configuration (Top View)
eTSSOP-20
PIN DESCRIPTION
No.
1
2
3
4
5
6
7
8
9
10,12,14
11,13
15,16,18,19
17
20
Pin
AVCC
RSET
SYNC
SDA
SCL
ADDR
INTB
SDB
GND
SW1~SW3
PGND
CS1~CS4
PVCC
VIO
Thermal Pad
Description
Power for analog circuits.
Input terminal used to connect an external resistor.
This regulates current source DC current value.
Synchronize pin. It is used for more than one part work
synchronize. If it is not used please float this pin.
I2C compatible serial data.
I2C compatible serial clock.
I2C address setting.
Interrupt output pin. Register F0h sets the function of
the INTB pin and active low when the interrupt event
happens. Can be NC (float) if interrupt function no
used.
Shut down the chip when pull to low.
Connect to GND.
Switch pin for LED matrix scanning.
Power GND.
Current source.
Power for current source.
Input logic reference voltage.
Need to connect to GND pins.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0B, 04/12/2017
4
IS32FL3740
ORDERING INFORMATION
Automotive Range: -40°C to +125°C
Order Part No.
IS32FL3740-ZLA3-TR
IS32FL3740-ZLA3
Package
eTSSOP-20, Lead-free
QTY
2500/Reel
70/Tube
Copyright © 2017 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
Rev. 0B, 04/12/2017
5
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