Description
The ICND2055 is a 16-channel PWM constant current sink LED driver for 1:32 time multiplexing applications (with 16 KB SRAM). The constant-current value of all 16 channels is set by a single external resistor.
ICND2055 converts serial input date into the gray scale of each pixel by a 16-bit shift register.ICND2055 detects individual LED open errors without extra components. ICND2055 also integrated pre-charge circuit for ghosting reduction.
The ICND2055 exploits precise current regulation technology, with both channel-to-channel error and chip-to-chip error less than ±2.0%.
Features
• 16 constant-current output channels
• Support time-multiplexing for 1~32 scans
• Output current setting range：
0.5~25mA×16@VDD=5V constant current output
0.5~18mA×16@VDD=4.2V constant current output
• Current accuracy
Between channel :< ±2.0 %(Max.)
Between ICs :< ±2.0 % (Max.)
• 8 bit current gain：22%~200%
• Fast response of output current:
• Data transfer frequency: fMAX=30MHz(Max)
• Power supply voltage: VDD=3.3～5V
• Operating Temperature: –40°C to +85°C
• Dynamic energy-saving
• Pre-charge for ghosting reduction
• LED open detection
• Enhanced Circuit for Caterpillar Cancelling
• Enhancement: Non-uniformity at low gray scale,
Color shift, low gray mosaics, Dim line at first scan
• Integrating LED protection circuit
• Elimination high contrast coupling an color-cast between modules
