Overview
The TLC5940PWPR is a 16-channel, constant-current sink LED driver produced by Texas Instruments. This device is designed to provide precise control over LED brightness and is particularly useful in applications requiring high-resolution dimming and color accuracy. Each channel of the TLC5940PWPR features individually adjustable 4096-step grayscale PWM brightness control and 64-step constant-current sink (dot correction), which helps in adjusting brightness variations between LED channels. The device also includes integrated EEPROM for storing dot correction data and error detection circuits such as LED open detection and thermal error flag.
Key Specifications
| Specification | Value |
|---|---|
| Package | HTSSOP (PWP) with 28 pins |
| Operating Temperature Range | -40°C to 85°C |
| Number of Channels | 16 |
| Grayscale PWM Control | 12 bit (4096 steps) |
| 6 bit (64 steps), storable in integrated EEPROM | |
| Drive Capability (Constant-Current Sink) | 0 mA to 60 mA (VCC < 3.6 V), 0 mA to 120 mA (VCC > 3.6 V) |
| LED Power Supply Voltage | Up to 17 V |
| VCC | 3 V to 5.5 V |
| Data Transfer Rate | 30 MHz |
| I/O Level | CMOS |
Key Features
- 16 individually adjustable channels with 4096-step grayscale PWM brightness control and 64-step constant-current sink (dot correction)
- Integrated EEPROM for storing dot correction data
- Serial data interface for accessing grayscale control and dot correction
- Controlled in-rush current to prevent voltage drops during startup
- LED open detection (LOD) and thermal error flag (TEF) for error monitoring
- Single external resistor sets the maximum current value for all 16 channels
- CMOS level I/O and 30 MHz data transfer rate
Applications
The TLC5940PWPR is suitable for various applications requiring precise LED control, such as:
- LED displays and signage
- Automotive lighting systems
- Consumer electronics with LED backlighting
- Industrial lighting and control systems
- Medical devices with LED indicators
Q & A
- What is the package type of the TLC5940PWPR?
The TLC5940PWPR comes in an HTSSOP (PWP) package with 28 pins. - What is the operating temperature range of the TLC5940PWPR?
The operating temperature range is -40°C to 85°C. - How many channels does the TLC5940PWPR have?
The TLC5940PWPR has 16 channels. - What is the resolution of the grayscale PWM control?
The grayscale PWM control has a resolution of 12 bits (4096 steps). - What is the purpose of the dot correction feature?
The dot correction feature adjusts the brightness variations between LED channels and other LED drivers. - How is the dot correction data stored?
The dot correction data is stored in an integrated EEPROM. - What is the maximum current capability of the TLC5940PWPR?
The maximum current capability is 0 mA to 60 mA (VCC < 3.6 V) and 0 mA to 120 mA (VCC > 3.6 V). - What is the LED power supply voltage range?
The LED power supply voltage range is up to 17 V. - What is the data transfer rate of the TLC5940PWPR?
The data transfer rate is 30 MHz. - What error detection features does the TLC5940PWPR have?
The TLC5940PWPR features LED open detection (LOD) and thermal error flag (TEF).
