TLC5946PWPR datasheet by Texas Instruments

TLC5946PWPR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the clock input?
  The maximum frequency of the clock input is 25 MHz. However, it's recommended to use a clock frequency between 10 kHz to 10 MHz for optimal performance.
• How do I properly sequence the grayscale and blanking signals?
  The grayscale signal should be updated during the blanking period (BLANK = 1). The blanking signal should be asserted (BLANK = 1) before updating the grayscale signal, and de-asserted (BLANK = 0) after the update is complete.
• What is the purpose of the OUTMOD0 and OUTMOD1 pins?
  The OUTMOD0 and OUTMOD1 pins are used to configure the output mode of the TLC5946. OUTMOD0 sets the output mode for channels 0-15, and OUTMOD1 sets the output mode for channels 16-31. The output modes can be set to either open-drain or totem-pole.
• How do I handle the thermal shutdown protection?
  The TLC5946 has a built-in thermal shutdown protection that activates when the junction temperature exceeds 150°C. When this occurs, the device will shut down and the outputs will be turned off. To handle this, ensure proper heat sinking and thermal management, and consider implementing a thermal monitoring and shutdown circuit.
• What is the recommended layout and routing for the TLC5946?
  To minimize noise and ensure proper operation, it's recommended to follow a star-topology layout, with the TLC5946 at the center. Keep the clock and data lines short and away from noisy signals, and use a solid ground plane to reduce electromagnetic interference.