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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
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Introduction
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
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User's Guide
SLVU139 - September 2005
TLC5940 EVM
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TLC5940 EVM
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Summary of Contents for Texas Instruments TLC5940 EVM
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Page 1: Table Of Contents
Bill of Materials Introduction 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. -
Page 2: Introduction
EVM except for the host computer and the two dc power supplies. 1.1.1 Software Texas Instruments has provided the software necessary to evaluate this EVM. Check the TLC5940 product folder on the TI website for the latest revision of the software. 1.1.2 Host Computer (PC) Requirements •... -
Page 3: Hardware Setup
Do not actively drive the same signals on J1 and J3 at the same time. As shown on the schematic, these signals from J1 are buffered before reaching the TLC5940 ICs. SLVU139 – September 2005 TLC5940 EVM... -
Page 4: J1 - Interface Connector
Table 3. EVM Power Requirements Pin Number Pin Symbol Voltage Range Max Current 3.3 V ± 0.1 V 1, 2 V_CC > 500 mA 7, 8 V_GB 4.0 V – 17 V > 2000 mA TLC5940 EVM SLVU139 – September 2005... -
Page 5: J3 - Power Connector
Introduction 1.3.3 J3 – Interface Connector This connector is used to connect the TLC5940 EVM to the TUSB3210 interface board. The signals are the same as on connector J1. Table 4. J3 – Power Connector Direction Pin Symbol Signal Name... -
Page 6: Data Input Mode Jumper Configurations
The TLC5940 requires 22V on the VPRG pin in order to program the internal EEPROM. This EEPROM programming voltage supply circuit uses a TPS61040 IC to provide 22V for this purpose. The circuit remains off until the /22V_EN signal is pulled low. TLC5940 EVM SLVU139 – September 2005... -
Page 7: Board Layout
EEPROM because DCPRG is low. 22 V 22V is enabled and applied to VPRG. The EEPROM can now be programmed. Grayscale input mode 3.3 V DOT correction input mode Board Layout This chapter provides the TLC5940EVM-106 board layout. SLVU139 – September 2005 TLC5940 EVM... -
Page 8: Assembly Layer
Board Layout Layout Figure 2. Assembly Layer TLC5940 EVM SLVU139 – September 2005... -
Page 9: Top Layer Routing
Board Layout Figure 3. Top Layer Routing SLVU139 – September 2005 TLC5940 EVM... -
Page 10: Layer 2 Routing
Board Layout Figure 4. Layer 2 Routing TLC5940 EVM SLVU139 – September 2005... -
Page 11: Layer 3 Routing
Board Layout Figure 5. Layer 3 Routing SLVU139 – September 2005 TLC5940 EVM... -
Page 12: Bottom Layer Routing
Board Layout Figure 6. Bottom Layer Routing TLC5940 EVM SLVU139 – September 2005... -
Page 13: Related Documentation From Texas Instruments
Related Documentation From Texas Instruments Related Documentation From Texas Instruments 1. TLC5940 data sheet (SLVS515) Bill of Materials and Schematic This chapter provides the TLC5940EVM-106 bill of materials and schematic. Bill of Materials Table 7. Bill of Materials Description... - Page 14 IC, 16 Bit buffer driver, 3-state outputs 48P TSSOP SN74AVC16244DGG (DGG) IC, High efficiency boost converter, 250mA, SOT23-5 TPS61040DBV 1.8- 6V Vin (DBV) PCB, 5.5 In x 3.35 In x 0.062 In HPA106 Shunt, 100mil, black 0.100 929950-00 TLC5940 EVM SLVU139 – September 2005...
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Page 15: Tlc5940Evm-106 Schematic
Bill of Materials and Schematic Schematic Figure 7. TLC5940EVM-106 Schematic SLVU139 – September 2005 TLC5940 EVM... -
Page 16: Tlc5940Evm-106 Schematic (Continued)
Bill of Materials and Schematic Figure 8. TLC5940EVM-106 Schematic (Continued) TLC5940 EVM SLVU139 – September 2005... - Page 17 EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2005, Texas Instruments Incorporated...
- Page 18 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...
- Page 19 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments TLC5940EVM-106...
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