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PWP
RHB
SLVS755 – MARCH 2007
16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL
FEATURES
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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
V
CC
= 3.0 V to 5.5 V
Serial Data Interface
30-MHz Data Transfer Rate
CMOS Level I/O
Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
APPLICATIONS
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Monocolor, Multicolor, Full-Color LED
Displays
LED Signboards
Display Back-lighting
DESCRIPTION
The TLC5945 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 TLC5945 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.
XLAT
CNT
1 0
GS Register
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT0
VCC
GND
SCLK
SIN
MODE
IREF
Max. OUTn
Current
V REF
=1.24V
MODE
0
1 0
11
0
DC Register
5
0
6−Bit Dot Correction
GSCLK
BLANK
GS Counter
CNT
Input
Shift
Register
192
LED Open Detection
0
Status
Information:
LOD,
TED,
DC DATA
191
96
192
CNT
GS Register
23
12
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT1
96
1 0
95
96
DC Register
11
6
6−Bit Dot Correction
MODE
LED Open Detection
96
Temperature
Error Flag
(TEF)
LED Open
Detection
(LOD)
CNT
Input
Shift
Register
191
GS Register
180
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT15
XERR
95
191
DC Register
90
6−Bit Dot Correction
LED Open Detection
SOUT
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 © 2007, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
