TLC5946
www.ti.com .......................................................................................................................................................... SLVS824B–MARCH 2008–REVISED JUNE 2008
16-Channel, 12-Bit PWM LED Driver with
6-Bit Dot Correction
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FEATURES
APPLICATIONS
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Monochrome, Multicolor, Full-Color LED
Displays
LED Signboards
Display Backlighting
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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
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LED Power-Supply Voltage up to 17 V
VCC = 3.0 V to 5.5 V
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.
Constant Current Accuracy:
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Channel-to-Channel = ±1% (typ)
Device-to-Device = ±2% (typ)
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30-MHz Data Transfer Rate
33-MHz Grayscale PWM Clock
Extended Serial Interface
CMOS Level I/O
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.
Schmitt Buffer Input
Readable Error Information:
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Continuous Base LED Open Detection
(LOD)
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Thermal Error Flag (TEF)
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Noise Reduction:
4-Channel Grouped Delay
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Operating Temperature: –40°C to +85°C
VLED
VLED
VLED
VLED
VCC
¼
¼
¼
¼
¼
OUT0
OUT15
SOUT
OUT0
SIN
OUT15
SOUT
OUT
SIN
XERR
XERR
SCLK
XLAT
XERR
SCLK
SCLK
XLAT
XLAT
TLC5946
TLC5946
ICn
VCC
VCC
Controller
MODE
IC1
MODE
MODE
BLANK
GSCLK
BLANK
VCC
XHALF
GND
VCC
XHALF
GND
BLANK
GSCLK
GSCLK
IN
IREF
IREF
RIREF
RIREF
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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.
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PowerPAD is a trademark of Texas Instruments, Inc.
All other trademarks are the property of their respective owners.
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