TLC5941
PWP
www.ti.com
RHB
NT
SLVS589D – JULY 2005 – REVISED JANUARY 2008
16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL
FEATURES
APPLICATIONS
• 16 Channels
• 12-Bit (4096 Steps) Grayscale PWM Control
• Dot Correction
– 6 Bit (64 Steps)
• Drive Capability (Constant-Current Sink)
– 0 mA to 80 mA
• LED Power Supply Voltage up to 17 V
• VCC = 3.0 V to 5.5 V
• Serial Data Interface
• Controlled In-Rush Current
• 30-MHz Data Transfer Rate
• CMOS Level I/O
• Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
•
•
•
1
2
VCC
SCLK
GND
Monocolor, Multicolor, Full-Color LED Displays
LED Signboards
Display Back-Lighting
DESCRIPTION
The TLC5941 is a 16-channel, constant-current sink,
LED driver. Each channel has an individually
adjustable 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. 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 TLC5941 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
condition.
SIN
XLAT
CNT
MODE
1 0
IREF
Max. OUTn
Current
V REF
=1.24V
GS Register
MODE
1 0
11
0
GSCLK
BLANK
0
DC Register
0
5
GS Counter
CNT
0
Status
Information:
LOD,
TED,
DC DATA
191
96
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT0
Delay
x0
6−Bit Dot Correction
LED Open Detection
Input
Shift
Register
CNT
192
192
GS Register
23
96
95
1 0
96
12
DC Register
11
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT1
Delay
x1
6−Bit Dot Correction
6
MODE
LED Open Detection
96
Temperature
Error Flag
(TEF)
LED Open
Detection
(LOD)
CNT
Input
Shift
Register
GS Register
191
XERR
180
DC Register
95
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT15
Delay
x15
6−Bit Dot Correction
90
191
LED Open Detection
SOUT
1
2
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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 © 2005–2008, Texas Instruments Incorporated