TLC5947

• 24 Channels, Constant-Current Sink Output
• 30-mA Capability (Constant-Current Sink)
• 12-Bit (4096 Steps) PWM Grayscale Control
• LED Power-Supply Voltage Up to 30 V
• V_CC = 3.0 V to 5.5 V
• Constant-Current Accuracy:
  • Channel-to-Channel = ±2% (Typical)
  • Device-to-Device = ±2% (Typical)
• CMOS Logic Level I/O
• 30-MHz Data Transfer Rate (Standalone)
• 15-MHz Data Transfer Rate (Cascaded Devices,
  SCLK Duty = 50%)
• Shift Out Data Changes With Falling Edge to
  Avoid Data Shift Errors
• Auto Display Repeat
• 4-MHz Internal Oscillator
• Thermal Shutdown (TSD):
  • Automatic Shutdown at OverTemperature Conditions
  • Restart Under Normal Temperature
• Noise Reduction:
  • 4-Channel Grouped Delay to Prevent Inrush Current
• Operating Temperature: –40°C to 85°C

The TLC5947 is a 24-channel, constant-current sink LED driver. Each channel is individually adjustable with 4096 pulse-width modulated (PWM) steps. PWM control is repeated automatically with the programmed grayscale (GS) data. GS data are written via a serial interface port. The current value of all 24 channels is set by a single external resistor.

The TLC5947 has a thermal shutdown (TSD) function that turns off all output drivers during an over-temperature condition. All of the output drivers automatically restart when the temperature returns to normal conditions.