TLC5945_16 Datasheet, PDF (1/30 Pages) Texas Instruments – 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL

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PWP
RHB
TLC5945
SLVS755 – MARCH 2007
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)
• 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
• 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.
VCC GND
SCLK
SIN
XLAT
IREF
Max. OUTn ^VREF
Current
=1.24V
GSCLK
BLANK
GS Counter CNT
0
Status
Information:
LOD,
TED,
DC DATA
191
96
192
96
MODE
10
0
MODE
10
GS Register
11
0
DC Register
5
0
Input
Shift
Register
192
95
96
10
MODE
96
GS Register
23
12
DC Register
11
6
CNT
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT0
6−Bit Dot Correction
LED Open Detection
CNT
12−Bit Grayscale
PWM Control
Constant-Current
Driver
OUT1
6−Bit Dot Correction
LED Open Detection
Temperature
Error Flag
(TEF)
LED Open
Detection
(LOD)
XERR
Input
Shift
Register
191
GS Register
191
180
DC Register
95
90
CNT
12−Bit Grayscale
PWM Control
6−Bit Dot Correction
LED Open Detection
Constant-Current
Driver
OUT15
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