TLC5940_15 Datasheet, PDF (1/38 Pages) Texas Instruments – 16-Channel LED Driver

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TLC5940
SLVS515D – DECEMBER 2004 – REVISED NOVEMBER 2015
TLC5940 16-Channel LED Driver With DOT Correction and Grayscale PWM Control
1 Features
•1 16 Channels
• 12 bit (4096 Steps) Grayscale PWM Control
• Dot Correction
– 6 bit (64 Steps)
– Storable in Integrated EEPROM
• Drive Capability (Constant-Current Sink)
– 0 mA to 60 mA (V_CC < 3.6 V)
– 0 mA to 120 mA (V_CC > 3.6 V)
• LED Power Supply Voltage up to 17 V
• V_CC = 3 V to 5.5 V
• Serial Data Interface
• Controlled In-Rush Current
• 30 MHz Data Transfer Rate
• CMOS Level I/O
• Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
2 Applications
• Monocolor, Multicolor, Full-Color LED Displays
• LED Signboards
• Display Backlighting
• General, High-Current LED Drive
3 Description
The TLC5940 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. The dot correction data is stored in an
integrated EEPROM. Both grayscale control and dot
correction are accessible through a serial interface. A
single external resistor sets the maximum current
value of all 16 channels.
The TLC5940 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PDIP (28)
35.69 mm × 6.73 mm
TLC5940
HTSSOP (28)
9.70 mm × 4.40 mm
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Block Diagram
VCC GND
SCLK
SIN
XLAT
DCPRG
IREF
Max. OUTn ^{VREF =1.24 V}
Current
GSCLK
BLANK
GS Counter
CNT
Status ⁰
96
Information: 192
LOD,
TED,
DC DATA
96
191
LED Open
Detection
(LOD)
Temperature
Error Flag
(TEF)
Blank
10
XERR
VPRG
10
0
VPRG
CNT
10
GS Register
0
11
DCPRG
1
DC Register
0
50
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
Input
Shift
Register
192
95
96
10
VPRG
96
0 DC EEPROM 5
VPRG
LED Open Detection
CNT
GS Register
12
23
DC Register
6
11
DCPRG
1
0
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
6 DC EEPROM11
VPRG
LED Open Detection
Constant Current
Driver
Delay
x0
Constant Current
Driver
Delay
x1
Input
Shift
Register
191
SOUT
CNT
GS Register
180
191
DCPRG
1
DC Register
90
95 0
12−Bit Grayscale
PWM Control
6−Bit Dot
Correction
DC EEPROM
90
95
LED Open Detection
VPRG
Constant Current
Driver
Delay
x15
OUT0
OUT1
OUT15
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.