TLC5948ADBQR datasheet by Texas Instruments

TLC5948ADBQR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the clock input?
  The maximum frequency of the clock input is 50 MHz, but it's recommended to use a clock frequency between 10 kHz to 20 MHz for optimal performance.
• 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 OUTGRP pin?
  The OUTGRP pin is used to group multiple TLC5948 devices together to increase the total number of output channels. It allows the devices to be connected in a daisy-chain configuration.
• How do I handle the thermal protection feature?
  The TLC5948 has a built-in thermal protection feature that limits the device junction temperature to 150°C. If the device overheats, it will shut down and restart when the temperature drops below 120°C. Ensure proper heat sinking and thermal design to prevent overheating.
• What is the recommended layout and routing for the TLC5948?
  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 with capacitors. Avoid routing critical signals under the device or near the heat sink.