TLC5943 Datasheet, PDF (1/34 Pages) Texas Instruments – 16-Channel, 16-Bit PWM LED Driver with 7-Bit Global Brightness Control

TLC5943
www.ti.com
16-Channel, 16-Bit PWM LED Driver with
7-Bit Global Brightness Control
SBVS101 – DECEMBER 2007
FEATURES
1
•23 16 Channels, Constant Current Sink Output
• 50-mA Capability (Constant Current Sink)
• 16-Bit (65,536 Steps) Grayscale Control with
Enhanced Spectrum (ES) PWM
• 7-Bit (128 Steps) Global Brightness Control for
All Channels with Sink Current
• LED Power-Supply Voltage up to 17 V
• V_CC = 3.0 V to 5.5 V
• Constant Current Accuracy:
– Channel-to-Channel = ±1.5%
– Device-to-Device = ±3%
• CMOS Level I/O
• 30-MHz Data Transfer Rate
• 33-MHz Grayscale Control Clock
• Auto Display Repeat
• Auto Data Refresh
• Continuous Base LED Open Detection (LOD):
– Detect LED opening and LED short to GND
during display
• Thermal Shutdown (TSD):
– Automatic shutdown at high temperature
conditions
– Restart under normal temperature
VLED
VLED
¼
• Readable Error Information:
– LED Open Detection (LOD)
– 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 TLC5943 is a 16-channel, constant current sink
driver. Each channel is individually adjustable with
65,536 enhanced spectrum pulse-width modulated
(PWM) steps controlled by grayscale (GS) data. All
output drivers are adjustable with 128 constant sink
current steps at same value controlled by brightness
control (BC) data. Both GS data and BC data are
writable via a serial interface port. The maximum
current value of all 16 channels can be set by a
single external resistor.
VLED
VLED
¼
¼
Controller
DATA
SCLK
BCSEL
XLAT
BLANK
GSCLK
FLAGS
READ
XERR
READ
R_IREF
¼
¼
¼ _OUT0
OUT15
SIN
SOUT
SCLK
XERR
BCSEL
XLAT
VCC VCC
BLANK
VCC
GSCLK
IREF
XTEST
TLC5943
IC1
GND
5
R_IREF
¼
¼ _OUT0
OUT15
SIN
SOUT
SCLK
XERR
BCSEL
XLAT
VCC
BLANK
GSCLK
IREF
TLC5943
ICn
VCC
XTEST
GND
XTEST pin must be connected to VCC or GND.
Typical Application Circuit (Multiple Daisy-Chained TLC5943s)
1
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