PWP

RHB

NT

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FEATURES

APPLICATIONS

DESCRIPTION

Delay

x0

12−Bit Grayscale

PWM Control

DC Register

GS Register

DC EEPROM

Constant Current

Driver

LED Open Detection

Temperature

Error Flag

(TEF)

Max. OUTn

Current

Delay

x1

12−Bit Grayscale

PWM Control

DC Register

GS Register

DC EEPROM

Constant Current

Driver

LED Open Detection

Delay

x15

6−Bit Dot

12−Bit Grayscale

PWM Control

DC Register

GS Register

DC EEPROM

Constant Current

Driver

LED Open Detection

OUT0

OUT1

OUT15

SOUT

SIN

SCLK

IREF

XERR

XLAT

GSCLK

BLANK

DCPRG

DCPRG

DCPRG

VPRG

VPRG

VPRG

GND

VCC

VPRG

Input

Shift

Register

Input

Shift

Register

VPRG

11

0

23

12

191

180

95

90

11

6

5

VPRG

0

0

95

96

191

LED Open

Detection

(LOD)

5

95

90

6

11

DCPRG

0

192

96

0

1

0

1

0

1

0

1

GS Counter

CNT

CNT

CNT

CNT

96

96

Status

Information:

LOD,

TED,

DC DATA

192

0

191

1

0

0

1

VREF =1.24 V

Correction

6−Bit Dot

Correction

6−Bit Dot

Correction

0

1

Blank

TLC5940

SLVS515A – DECEMBER 2004 – REVISED AUGUST 2005

16 CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL

•

Monocolor, Multicolor, Fullcolor LED Displays

•

16 Channels

•

LED Signboards

•

12 bit (4096 Steps) Grayscale PWM Control

•

Display Backlighting

•

Dot Correction

•

General, High-Current LED Drive

– 6 bit (64 Steps)

– Storable in Integrated EEPROM

•

Drive Capability (Constant Current Sink)

The TLC5940 is a 16-channel constant-current sink

LED driver. Each channel has an individually adjust-

able 4096-step grayscale PWM brightness control

and a 64-step constant-current sink (dot correction).

•

LED Power Supply Voltage up to 17 V

The dot correction adjusts the brightness variations

•

between LED channels and other LED drivers. The

•

Serial Data Interface, SPI comp.

dot correction data is stored in an integrated

EEPROM. Both grayscale control and dot correction

•

Controlled In-Rush Current

are accessible via a serial interface. A single external

•

30-MHz Data Transfer Rate

resistor sets the maximum current value of all 16

•

CMOS Level I/O

channels.

•

Error Information

The TLC5940 features two error information circuits.

– LOD: LED Open Detection

The LED open detection (LOD) indicates a broken or

disconnected LED at an output terminal. The thermal

– TEF: Thermal Error Flag

error flag (TEF) indicates an overtemperature con-

dition.

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.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, 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.