TLC5940 Datasheet, PDF (1/29 Pages) Texas Instruments – 16 CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL

TLC5940
www.ti.com
PWP
RHB
NT
SLVS515A – DECEMBER 2004 – REVISED AUGUST 2005
16 CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL
FEATURES
• 16 Channels
• 12 bit (4096 Steps) Grayscale PWM Control
• Dot Correction
– 6 bit (64 Steps)
– Storable in Integrated EEPROM
• Drive Capability (Constant Current Sink)
– 0 mA to 60 mA (V_CC < 3.6 V)
– 0 mA to 120 mA (V_CC > 3.6 V)
• LED Power Supply Voltage up to 17 V
• V_CC = 3 V to 5.5 V
• Serial Data Interface, SPI comp.
• Controlled In-Rush Current
• 30-MHz Data Transfer Rate
• CMOS Level I/O
• Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
APPLICATIONS
• Monocolor, Multicolor, Fullcolor LED Displays
• LED Signboards
• Display Backlighting
• General, High-Current LED Drive
DESCRIPTION
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).
The dot correction adjusts the brightness variations
between LED channels and other LED drivers. The
dot correction data is stored in an integrated
EEPROM. Both grayscale control and dot correction
are accessible via a serial interface. A single external
resistor sets the maximum current value of all 16
channels.
The TLC5940 features two error information circuits.
The LED open detection (LOD) indicates a broken or
disconnected LED at an output terminal. The thermal
error flag (TEF) indicates an overtemperature con-
dition.
VCC GND
SCLK
SIN
XLAT
DCPRG
IREF
Max. OUTn ^{VREF =1.24 V}
Current
GSCLK
BLANK
GS Counter
CNT
Status ⁰
96
Information: 192
LOD,
TED,
DC DATA
96
191
LED Open
Detection
(LOD)
Temperature
Error Flag
(TEF)
Blank
10
XERR
VPRG
10
0
VPRG
CNT
10
GS Register
0
11
DCPRG
1
DC Register
0
50
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
Input
Shift
Register
192
95
96
10
VPRG
96
0 DC EEPROM 5
VPRG
LED Open Detection
CNT
GS Register
12
23
DC Register
6
11
DCPRG
1
0
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
6 DC EEPROM11
VPRG
LED Open Detection
Constant Current
Driver
Delay
x0
Constant Current
Driver
Delay
x1
Input
Shift
Register
191
SOUT
CNT
GS Register
180
191
DCPRG
1
DC Register
90
95 0
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
DC EEPROM
90
95
LED Open Detection
VPRG
Constant Current
Driver
Delay
x15
OUT0
OUT1
OUT15
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated