TLC5946_16 Datasheet, PDF (1/41 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction

TLC5946
www.ti.com .......................................................................................................................................................... SLVS824B – MARCH 2008 – REVISED JUNE 2008
16-Channel, 12-Bit PWM LED Driver with
6-Bit Dot Correction
FEATURES
1
•23 16 Channels, Constant Current Sink Output
• 40-mA Capability (Constant Current Sink)
• 12-Bit (4096 Steps) Grayscale PWM Control
• 6-Bit (64 Steps) Dot Correction
• LED Power-Supply Voltage up to 17 V
• V_CC = 3.0 V to 5.5 V
• Constant Current Accuracy:
– Channel-to-Channel = ±1% (typ)
– Device-to-Device = ±2% (typ)
• 30-MHz Data Transfer Rate
• 33-MHz Grayscale PWM Clock
• Extended Serial Interface
• CMOS Level I/O
• Schmitt Buffer Input
• Readable Error Information:
– Continuous Base LED Open Detection
(LOD)
– Thermal Error Flag (TEF)
• Noise Reduction:
– 4-Channel Grouped Delay
• Operating Temperature: –40°C to +85°C
APPLICATIONS
• Monochrome, Multicolor, Full-Color LED
Displays
• LED Signboards
• Display Backlighting
DESCRIPTION
The TLC5946 is a 16-channel, constant current sink
LED driver. Each channel is individually adjustable
with 4096 pulse-width modulated (PWM) steps and
64 constant current sink steps for dot correction. The
dot correction adjusts the brightness variations
between LEDs. Both grayscale control and dot
correction are accessible via a serial interface. The
maximum current value of all 16 channels can be set
by a single external resistor.
The TLC5946 has two error information circuits: one
for LED open detection (LOD), and a thermal error
flag (TEF). LOD detects a broken or disconnected
LED during display period. TEF indicates an
over-temperature condition.
V_LED
V_LED
V_CC
¼
¼
V_LED
V_LED
¼
Controller
OUT
XERR
SCLK
XLAT
MODE
BLANK
GSCLK
IN
R_IREF
¼ _OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC5946
MODE
IC1
V_CC
BLANK
VCC
GSCLK
XHALF
IREF
GND
R_IREF
¼ _OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC5946
MODE
ICn
V_CC
BLANK
VCC
GSCLK
XHALF
IREF
GND
6
Typical Application Circuit (Multiple Daisy-Chained TLC5946s)
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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 © 2008, Texas Instruments Incorporated