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1 Introduction
User's Guide
SLVU139 – September 2005
TLC5940 EVM
This user’s guide describes the characteristics, operation, and use of the
TLC5940EVM-106 evaluation module (EVM). This EVM is designed to help the user
evaluate and test the various operating modes of the TLC5940. This user’s guide
includes setup instructions for the hardware and software, a schematic diagram, a bill
of materials (BOM), and PCB layout drawings for the evaluation module
Contents
1 Introduction .......................................................................................... 1
2 Board Layout ........................................................................................ 7
3 Related Documentation From Texas Instruments ............................................ 13
4 Bill of Materials and Schematic ................................................................. 13
List of Figures
1 Hardware Setup ..................................................................................... 3
2 Assembly Layer ..................................................................................... 8
3 Top Layer Routing .................................................................................. 9
4 Layer 2 Routing ................................................................................... 10
5 Layer 3 Routing ................................................................................... 11
6 Bottom Layer Routing ............................................................................ 12
7 TLC5940EVM-106 Schematic ................................................................... 15
8 TLC5940EVM-106 Schematic (Continued) .................................................... 16
List of Tables
1 J1 – Interface Connector .......................................................................... 4
2 J2 – Power Connector ............................................................................. 4
3 EVM Power Requirements ........................................................................ 4
4 J3 – Power Connector ............................................................................. 5
5 Data Input Mode Jumper Configurations ........................................................ 6
6 Data Input Mode Jumper Configurations ........................................................ 7
7 Bill of Materials .................................................................................... 13
The Texas Instruments TLC5940 is a 16 channel constant current LED driver that is capable of driving
120 mA per channel. The IC contains an integrated DOT correction circuitry that adjusts the dc current for
each output channel to compensate for brightness difference between LEDs. DOT correction information
can be written into a non-volatile EEPROM or into internal registers. It also has integrated PWM grayscale
control to provide individual LED dimming.
This EVM contains three TLC5940 ICs that are connected in series. The three TLC5940 ICs drive 16
red-green-blue light emitting diodes (RGB LEDs). Each TLC5940 drives a separate color. Each TLC5940
has 16 outputs and each output is connected to a different LED. Using the software, the user individually
controls the DOT correction and grayscale values for each color of each LED.
SLVU139 – September 2005 TLC5940 EVM 1
