1

FEATURES

APPLICATIONS

DESCRIPTION

¼

SIN

XERR

SCLK

XLAT

MODE

GSCLK

SOUT

VCC

GND

TLC5946

IC1

OUT0

OUT15

XHALF

¼

¼

V

LED

V

LED

¼

SIN

SCLK

XLAT

BLANK

R

IREF

IREF

SOUT

TLC5946

ICn

OUT0

OUT15

OUT

XERR

SCLK

XLAT

MODE

BLANK

GSCLK

IN

¼

V

LED

V

LED

R

IREF

IREF

Controller

6

BLANK

GSCLK

MODE

XERR

VCC

GND

XHALF

V

CC

V

CC

V

CC

TLC5946

16-Channel, 12-Bit PWM LED Driver with

6-Bit Dot Correction

• Monochrome, Multicolor, Full-Color LED

23

• 16 Channels, Constant Current Sink Output

Displays

• 40-mA Capability (Constant Current Sink)

• LED Signboards

• 12-Bit (4096 Steps) Grayscale PWM Control

• Display Backlighting

• 6-Bit (64 Steps) Dot Correction

• LED Power-Supply Voltage up to 17 V

• V

The TLC5946 is a 16-channel, constant current sink

• Constant Current Accuracy:

LED driver. Each channel is individually adjustable

with 4096 pulse-width modulated (PWM) steps and

–

Channel-to-Channel = ±1% (typ)

64 constant current sink steps for dot correction. The

–

Device-to-Device = ±2% (typ)

dot

correction

adjusts

the

brightness

variations

• 30-MHz Data Transfer Rate

between LEDs. Both grayscale control and dot

correction are accessible via a serial interface. The

• 33-MHz Grayscale PWM Clock

maximum current value of all 16 channels can be set

• Extended Serial Interface

by a single external resistor.

• CMOS Level I/O

The TLC5946 has two error information circuits: one

• Schmitt Buffer Input

for LED open detection (LOD), and a thermal error

• Readable Error Information:

flag (TEF). LOD detects a broken or disconnected

LED

during

display

period.

TEF

indicates

an

–

Continuous Base LED Open Detection

over-temperature condition.

(LOD)

–

Thermal Error Flag (TEF)

• Noise Reduction:

–

4-Channel Grouped Delay

• Operating Temperature: –40°C to +85°C

Typical Application Circuit (Multiple Daisy-Chained TLC5946s)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments, Inc.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.