TLC5920DLRG4 datasheet by Texas Instruments

TLC5920DLRG4 Frequently Asked Questions (FAQs)

• What is the maximum current that can be sourced or sunk by each output?
  The TLC5920 can source up to 25mA and sink up to 50mA per output, but it's recommended to limit the current to 10mA per output for reliable operation.
• How do I ensure that the TLC5920 is properly powered up and initialized?
  The TLC5920 requires a power-on reset (POR) to ensure proper initialization. A 10uF capacitor between VCC and GND, and a 1kΩ resistor between VCC and SCL are recommended to ensure a clean power-up sequence.
• What is the maximum frequency of the I2C clock (SCL) that the TLC5920 can handle?
  The TLC5920 can handle I2C clock frequencies up to 400kHz, but it's recommended to limit the frequency to 100kHz for reliable operation.
• How do I handle the LED current programming for the TLC5920?
  The TLC5920 uses a 7-bit current register to program the LED current. The current is set using the I2C interface, and the register value is proportional to the desired current. A detailed calculation is provided in the datasheet.
• What is the purpose of the OE (Output Enable) pin, and how do I use it?
  The OE pin is used to enable or disable all outputs simultaneously. When OE is low, all outputs are enabled. When OE is high, all outputs are disabled. This pin can be used to quickly turn off all LEDs during power-down or reset conditions.