TLC5946PWP datasheet by Texas Instruments

TLC5946PWP Frequently Asked Questions (FAQs)

• What is the maximum frequency of the clock input?
  The maximum frequency of the clock input is 30 MHz, but it's recommended to keep it below 20 MHz for reliable operation.
• How do I properly sequence the GSCLK, SCLK, and XLAT signals?
  The recommended sequence is: GSCLK low, SCLK low, XLAT high, then GSCLK high, SCLK high, and finally XLAT low. This ensures proper data loading and latch operation.
• What is the purpose of the VPRG pin, and how do I use it?
  The VPRG pin is used to set the internal voltage reference for the grayscale PWM generator. Connect it to a voltage source between 1.2V and 3.3V to set the reference voltage, or leave it open for a default internal reference of 1.2V.
• How do I handle thermal shutdown and overcurrent protection?
  The TLC5946PWP has built-in thermal shutdown and overcurrent protection. If the device overheats or detects an overcurrent condition, it will shut down. To handle this, monitor the THERMAL_SHDN and OC pins, and implement a reset or shutdown sequence in your system to recover from these events.
• What is the recommended layout and routing for the TLC5946PWP?
  Keep the GSCLK, SCLK, and XLAT signal traces short and away from noisy power supply lines. Use a solid ground plane and decouple the power supply pins with capacitors. Also, keep the OUTx pins away from the digital signal traces to minimize noise coupling.