ISSI LUMISSIL IS31FL3248 Manual

48-CHANNEL, 16-BIT PWM LED DRIVER
DESCRIPTION
The IS31FL3248 is a 48-channel constant current LED
driver. Each channel has 16-bit PWM brightness control,
and 64 steps of constant-current scaling (SL). SL can
adjust brightness deviation between channels. GCC
can adjusts brightness deviation between the R, G, and
B color groups. The 8 steps maximum current band
control (CB) selects the maximum output current range
for all channels.
Proprietary programmable algorithms are used in
IS31FL3248 to minimize audible noise that can result
from MLCC decoupling capacitor. SL, GCC, CB and all
other registers can be programmed via a high-speed
VSB (video series bus, up to 33MHz) or SPI (up to
33MHz) serial interface port.
IS31FL3248 software shutdown mode can put the
device to sleep (for minimum power consumption) while
retaining all register values.
IS31FL3248 is available in QFN-64 (8mm×8mm)
package. It operates from 3.0V to 5.5V over the
temperature range of -40°C to +125°C.
QUICK START
Figure 1: Photo of IS31FL3248 Evaluation Board
Lumissil Microsystems – www.lumissil.com
Rev. A, 12/16/2022
FEATURES

V = 3.0V to 5.5V
CC

Tolerate up to 18V, nominal operation voltage
between 4.5V to 16V, multiple LED's can be
connected in series

Support 48 current sink output channels

33mA@V = 5V/channel maximum
CC

23mA@V = 3V/channel maximum
CC

Maximum Current Band (CB)
- 3-bit (8 steps) with a 9.7% to 100% range

DC Current Scaling (SL)

6-bit (64 steps) with a 25.9% to 100% range

Individual 16-bit, 8+8-bit
dithering, 8-bit PWM mode

Global Current Control (GCC)

8-bit (256 steps) with a 9.6% to 100% range

3 GCC sets for each color group

Constant Current Accuracy

Channel to Channel = ±2%(Typ.), ±5%(Max.)

Device to Device = ±2%(Typ.), ±5%(Max.)

Chain topology via VSB interface, PWM data I/O
is daisy chained
transmission (write and read)

Support bi-directional data output via DI

Grayscale Control Clock: 33MHz

Display timing reset

Real-time LED open detection (LOD)

Real-time LED short detection (LSD)

Over temperature protection

Spread Spectrums

Software shutdown mode

180-degree phase delay operation to reduce
power noise

AEC-Q100 qualification in progress

Operation temperature range: -40°C to +125°C

QFN-64 (8mm×8mm) package

RoHS & Halogen-Free Compliance

TSCA Compliance
RECOMMENDED EQUIPMENT

5V, ≥1.5A power supply
ABSOLUTE MAXIMUM RATINGS

VIN+, ≤7V power supply
Caution: EVB is designed for 5V application, higher than 7V will
cause extra-heat on the IC and if VIN (TP1) is higher than 7V, the
IS31FL3248 will be too hot and enter thermal shutdown mode, if
VIN (TP1) exceeds the conditions listed above, the board may be
damaged.
dithering, 8+4-bit
with bi-directional data
1