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This user's guide describes the characteristics, operation, and use of the TLC5924EVM-186 evaluation
module (EVM). This EVM is designed to help the user evaluate and test the various operating modes of
the TLC5923 and TLC5924 LED drivers. 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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1
Introduction
2
Board Layout
3
Schematic and Bill of Materials
1
Hardware Setup
2
Assembly Layer
3
Top Layer Routing
4
Layer 2 Routing
5
Layer 3 Routing
6
Bottom Layer Routing
7
TLC5924EVM-186 Schematic (a)
8
TLC5924EVM-186 Schematic (b)
1
J1 – Interface Connector
2
J2, J3, J4, J5 – Power Connectors
3
EVM Power Requirements
4
TLC5924EVM-186 Bill of Materials
1
Introduction
The Texas Instruments TLC5923 is a 16-channel, constant-current LED driver that is capable of driving up
to 80 mA per channel. The integrated circuit (IC) contains integrated DOT correction circuitry that adjusts
the DC current for each output channel to compensate for brightness difference among LEDs. DOT
correction information can be written into internal registers. The TLC5924 is a device nearly identical to
the TLC5923, with the exception of an added precharge FET. The precharge FET eliminates the ghosting,
or spike current effect, that is associated with driving time-multiplexed strings of LEDs from a single IC.
This EVM contains a TLC5923 IC connected in parallel with a TLC5924 IC. The two ICs drive 16 red and
16 green light-emitting diodes (LED). The LEDs are separated into two banks, so that all red LEDs reside
on bank A, while all green LEDs reside on bank B. Both the TLC5923 and TLC5924 contain 16 outputs
each and every output is connected to a different pair of red and green LEDs. A switch on the EVM (S1)
selects which IC to activate, so that only one IC is on during normal operation. Using the supplied
software, the user individually controls the DOT correction and on/off values for each LED. Two modes of
operation are present in the software: Single-Bank Mode and Multiplex Mode. In Single-Bank Mode, the
user selects which bank of LEDs to activate, so that only the red or green LEDs are programmable. In
Multiplex Mode, both rows of LEDs are programmed sequentially at a high rate, giving the appearance
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SLVU187A – September 2006 – Revised June 2007
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SLVU187A – September 2006 – Revised June 2007
Contents
List of Figures
List of Tables
User's Guide
TLC5924EVM
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TLC5924EVM
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Summary of Contents for Texas Instruments TLC5924EVM
- Page 1 TLC5924EVM-186 Bill of Materials Introduction The Texas Instruments TLC5923 is a 16-channel, constant-current LED driver that is capable of driving up to 80 mA per channel. The integrated circuit (IC) contains integrated DOT correction circuitry that adjusts the DC current for each output channel to compensate for brightness difference among LEDs. DOT correction information can be written into internal registers.
- Page 2 In both modes of operation, the software allows the user to enter the LED DOT correction and enable information for every LED. The software then communicates with the TLC5924EVM via an USB Interface Adapter. This interface board generates the individual data signals necessary to program the TLC5924EVM so that it properly drives the LEDs.
- Page 3 Figure 1 when setting up the TLC5924EVM hardware. Attach the 10-pin ribbon cable between the USB Interface Adapter and the TLC5924EVM board (the connectors on the boards and the ribbon cable are keyed to only allow connection with the proper orientation) Attach the 5.5-V (2-A) power supply to the LED board between J4 (VLED) and J5 (GND).
- Page 4 S1 is a 3-pin switch that allows the user to activate either the TLC5923 or TLC5924. Moving the switch to the right applies power to the TLC5923 and deactivates the TLC5924. Moving the switch to the left applies power the TLC5924 and deactivates the TLC5923. TLC5924EVM SLVU187A – September 2006 – Revised June 2007 Submit Documentation Feedback...
- Page 5 2. Turn on the 3.3-V and 5.5-V power supplies 3. If not yet running, run the TLC5924EVM software program on the PC. To do this, click on the Start menu, then under Programs, navigate to Texas Instruments Incorporated. Click on the TLC5924EVM Software to run the program.
- Page 6 1.5.3 Signal-Conditioning Buffer The TLC5924EVM PWB contains a buffer to condition the input signals to the EVM. This buffer, SN74AVC16244, eliminates any noise on the input signals, generates fast, clean rise and fall times, and improves the drive capability of the signals. Due to a weak pullup capability on the USB Interface Adapter, all input signals on J1 are connected to 3.3V via 10-kΩ...
- Page 7 Board Layout Figure 3. Top Layer Routing Figure 4. Layer 2 Routing SLVU187A – September 2006 – Revised June 2007 TLC5924EVM Submit Documentation Feedback...
- Page 8 Board Layout Figure 5. Layer 3 Routing Figure 6. Bottom Layer Routing TLC5924EVM SLVU187A – September 2006 – Revised June 2007 Submit Documentation Feedback...
- Page 9 Schematic and Bill of Materials Schematic and Bill of Materials This section provides the TLC5924EVM-186 schematic and bill of materials. Schematics Figure 7. TLC5924EVM-186 Schematic (a) SLVU187A – September 2006 – Revised June 2007 TLC5924EVM Submit Documentation Feedback...
- Page 10 Schematic and Bill of Materials Figure 8. TLC5924EVM-186 Schematic (b) TLC5924EVM SLVU187A – September 2006 – Revised June 2007 Submit Documentation Feedback...
- Page 11 Schematic and Bill of Materials Bill of Materials Table 4. TLC5924EVM-186 Bill of Materials Count RefDes Value Description Size Part Number C1, C3–C6, C8 0.1μF Capacitor, Ceramic, 50V, X7R, 10% 0805 C2012X7R1H104K 10μF Capacitor, Ceramic, 25V, X5R, 10% 1210...
- Page 12 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
- Page 13 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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