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TLC5940NT

16-CH LED driver, 12-bit PWM, 6-bit dot correction EEPROM, 120mA/ch, PDIP-28

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Manufacturer Part：

TLC5940NT

Package：

PDIP-28 (35.69 x 6.73 mm)

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Description

Product Overview

The TLC5940NT from Texas Instruments is a 16-channel constant-current sink LED driver with 12-bit (4096-step) grayscale PWM brightness control and 6-bit (64-step) dot correction stored in integrated EEPROM. Each channel delivers up to 120mA (VCC > 3.6V) with LED supply voltage up to 17V. The NT suffix denotes the 28-pin PDIP package for through-hole applications.

Key Specifications

Number of Channels 16
Grayscale Resolution 12-bit (4096 steps)
Dot Correction Resolution 6-bit (64 steps)
Max Output Current 60mA (VCC < 3.6V), 120mA (VCC > 3.6V)
LED Supply Voltage Up to 17V
VCC Supply 3V to 5.5V
Data Transfer Rate 30MHz
Reference Voltage 1.24V (IREF pin)
Operating Temperature -40°C to +85°C
Package PDIP-28

Features

  • 16-channel constant-current sink driver
  • 12-bit grayscale PWM per channel
  • 6-bit dot correction with EEPROM storage
  • Single external resistor sets max current
  • LED open detection (LOD)
  • Thermal error flag (TEF)
  • Serial interface with 30MHz data rate
  • Controlled in-rush current

Applications

  • Monocolor, multicolor, and full-color LED displays
  • LED signboards and video walls
  • Display backlighting
  • General high-current LED drive

The TLC5940NT is a 16-channel constant-current sink LED driver from Texas Instruments in a 28-pin PDIP through-hole package. Each of the 16 output channels features individually adjustable 12-bit (4096-step) grayscale PWM brightness control and 6-bit (64-step) dot correction, with dot correction data stored in integrated EEPROM for power-up consistency. The maximum output current per channel is set by a single external resistor on the IREF pin, up to 60mA when VCC is below 3.6V or 120mA when above 3.6V. LED supply voltage can be up to 17V, enabling driving of multiple series-connected LEDs. Error detection includes LED open detection (LOD) and thermal error flag (TEF) for diagnostic monitoring.

The TLC5940NT operates as a serially programmed constant-current sink driver. Data is clocked in via the SIN pin at up to 30MHz on the SCLK rising edge, with XLAT latching data into internal registers. Grayscale (GS) data is 192 bits wide (16 channels x 12 bits), while dot correction (DC) data is 96 bits wide (16 channels x 6 bits). The VPRG pin selects between GS mode (VPRG = GND) and DC programming mode (VPRG = VCC). The GSCLK pin serves as the PWM clock; each GSCLK cycle decrements the grayscale counter, and the output turns off when the counter reaches zero. Dot correction scales the maximum current per channel according to IOUT = IMAX x DCn/63, where IMAX = 31.5 x (1.24V / R_IREF). The BLANK pin forces all outputs off and resets GS counters. The XERR pin is an open-drain error flag indicating LOD or TEF conditions.

Pin Name Type Description
1-2 OUT0-OUT1 Output Constant-current sink outputs for LED channels 0-1
3 GND Ground Device ground
4-6 OUT2-OUT4 Output Constant-current sink outputs for LED channels 2-4
7 VCC Power Logic supply voltage (3V to 5.5V)
8-11 OUT5-OUT8 Output Constant-current sink outputs for LED channels 5-8
12 IREF Analog Current reference; connect resistor to GND to set max output current
13 XERR Output Error flag output; open-drain, active low (LOD or TEF)
14-17 OUT9-OUT12 Output Constant-current sink outputs for LED channels 9-12
18 SCLK Input Serial data clock input
19 SIN Input Serial data input
20 SOUT Output Serial data output for daisy-chaining
21-23 OUT13-OUT15 Output Constant-current sink outputs for LED channels 13-15
24 XLAT Input Latch signal; rising edge transfers shift register to GS or DC register
25 BLANK Input Blank input; HIGH forces all outputs off and resets GS counters
26 GSCLK Input Grayscale clock; each rising edge decrements GS counter
27 DCPRG Input Dot correction programming select; HIGH = DC register, LOW = EEPROM
28 VPRG Input Mode select; GND = GS mode, VCC = DC input mode
  • Full-Color LED Video Walls: Drives RGB LED arrays with 12-bit per-channel PWM providing 16.7M color depth per pixel and dot correction ensuring uniform brightness across large display panels
  • LED Signboards: Controls monochrome or multi-color outdoor signage with 4096-step brightness per channel and EEPROM dot correction for consistent appearance across temperature variations
  • Display Backlighting: Provides precise PWM dimming for LCD backlight LED strings with dot correction compensating for LED binning variations
Model Manufacturer CH GS Bits Key Difference
TLC5940PWP TI 16 12 HTSSOP-28 surface mount package
TLC5940RHB TI 16 12 VQFN-32, smallest footprint
TLC5947RHT TI 24 12 24 channels, no EEPROM
IS31FL3731-QFLS4-TR Lumissil 16×9 8 Matrix driver, 144 LEDs, I2C
MAX7219CNG ADI 8 8 Simpler 8-segment driver, no dot correction
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Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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