Holtek announced its new release of an 8-channel constant current LED display driver IC, the HT16D595. The device greatly improves the disadvantages of uneven illumination levels and high failure rates as well as offering pin and system instruction compatibility with that of traditional 8-channel constant voltage drivers.

The HT16D595 is equipped with a 48mA±6% constant current drive output providing constant LED display illumination levels even when the LED forward voltages are different. The outputs can withstand voltages of up to 17V greatly reducing the failure rates of the LED display. An internal CMOS shift register and latch function can convert the serial input data to a parallel output data format. The current will vary with the external output voltage (VDS) variations but can be controlled to within 0.5% for each voltage change or to within 1% for the supply voltage (VDD). When the VLED voltage is 4V, the LED display power consumption can be reduced by 20% which also additionally reduces the IC temperature.In addition, the high clock frequency rate of 25MHz can support systems with high volume data transmission requirements. The target applications for the HT16D595 device are those which include high level single/double color LED character displays, for which there are many.

Features

• Logic supply voltage: 3.3V~5.5V
  
• 8-channel constant current output
  
• Channel output current is fixed at 48mA
  
• Build-in current setting resistor
  
• High output current accuracy:
  
• Variation between chips is less than ±6%
  
• Up to 25MHz serial interface clock frequency
  
• Maximum output terminal voltage 17V
  
• Schmitt trigger input structure
  
• 16-pin NSOP package