TLC5942 Datasheet, PDF (1/33 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 7-Bit Dot Correction

TLC5942
www.ti.com
SBVS096B – OCTOBER 2007 – REVISED OCTOBER 2007
16-Channel, 12-Bit PWM LED Driver with
7-Bit Dot Correction
FEATURES
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•23 16 Channels, Constant Current Sink Output
• 50-mA Capability (Constant Current Sink)
• 12-Bit (4096 Steps) Grayscale Control with
PWM
• 7-Bit (128 Steps) Dot Correction with Sink
Current
• LED Power-Supply Voltage up to 17 V
• Constant Current Accuracy:
– Channel-to-Channel = ±1.5%
– Device-to-Device = ±3%
• VCC = 3.0 V to 5.5 V
• CMOS Level I/O
• 30-MHz Data Transfer Rate
• 30-MHz Grayscale Control Clock
• Dedicated Ports for Grayscale and Dot
Correction
• Continuous Base LED Open Detection (LOD)
• Thermal Shutdown (TSD):
– Automatic shutdown at high temperature
conditions
– Restart under normal temperature
• Readable Error Information:
– LED Open Detection
– Thermal Error Flag (TEF)
• Noise Reduction:
– 4-Channel grouped delay to prevent inrush
current
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• Monochrome, Multicolor, Full-Color LED
Displays
• LED Signboards
• Display Backlighting
DESCRIPTION
The TLC5942 is a 16-channel, constant current sink
driver. Each channel is individually adjustable with
4096 pulse-width modulated (PWM) steps and 128
constant current sink steps for dot correction. Dot
correction adjusts the brightness variations between
LEDs. Both grayscale control and dot correction are
accessible via separate, dedicated serial interface
ports. The maximum current value of all 16 channels
can be set by a single external resistor.
VLED
VLED
¼
¼
VLED
VLED
¼
GSDATA
Controller
for Grayscale
(Outside of
LED module)
GSSCLK
XGSLAT
BLANK
ERROR
READ
R_IREF
OUT0
GSSIN
GSSCLK
XGSLAT
BLANK
DCSIN
DCSCLK
XDCLAT
IREF
¼ _OUT15
GSSOUT
TLC5942
IC1
DCSOUT
VCC
VCC
GND
R_IREF
OUT0
GSSIN
GSSCLK
XGSLAT
BLANK
DCSIN
DCSCLK
XDCLAT
IREF
¼ _OUT15
GSSOUT
TLC5942
ICn
VCC
VCC
GND
Controller for DCDATA
Dot Correction _DCSCLK
with
Correction ^XDCLAT
Data ROM
(Inside of
LED module)
Typical Application Circuit (Multiple Daisy-Chained TLC5942s)
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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, Inc.
2
All other trademarks are the property of their respective owners.
3
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