Specifications - 3.0 to 5.5 V logic supply range
- Schmitt trigger inputs for improved noise immunity
- Power-On Reset (POR)
- Up to 80 mA constant-current sinking outputs
- LED open circuit detection (LOD)
- Dot correction (DC) for adjusting LED light intensity on each channel with 7-bit resolution
- Low-power CMOS logic and latches
- High data input rate up to 30 MHz
- Active output pull-ups with enable/disable
- 20 ns typical staggering delay between outputs
- Internal UVLO and thermal shutdown (TSD) circuitry
- Fault output flags for an LED open circuit (LOD) or a thermal shutdown (TSD) condition
- Display backlighting
- Monocolor, multicolor, or full-color LED display
- Monocolor, multicolor, LED Signboard
- Multicolor LED lighting
Description
The A6285 is designed for LED display applications. This BiCMOS device includes an On/Off shift register, a Dot Correction (DC) shift register, accompanying data latches, and 16 MOS constant-current sink drivers with active pull-ups that can be enabled or disabled as required by the application.
The CMOS shift registers and latches A6285 allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, typical serial data input rates can reach up to 30 MHz. The LED drive current level can be set by a single external resistor, selected by the application designer. A CMOS serial data output permits cascading of multiple devices in applications requiring additional drive lines.
Individual LED light intensity can be adjusted to correct for light intensity variations by using the Dot Correction feature.
Open LED connections can be detected, and then signaled back to the host microprocessor through the serial data output (SDO pin). The FAULT output flags an LED open circuit (LOD) condition or a thermal shutdown (TSD) condition. A staggering delay on the load outputs during ON/OFF transitions helps to reduce ground bounce.
The device A6285 is available in a 32-lead QFN (package ET), with an exposed thermal pad. It is lead (Pb) free with 100% matte tin leadframe plating.
A6285 Data Sheet
