Constant-Current LED Driver Allows Multiple Devices to Be Cascaded and Programmed Via One Serial Interface
Catalyst Semiconductor, Inc. has expanded its recently introduced family of large LED video display drivers with the CAT4008, an 8-channel, constant-current sink LED driver for billboard, marquee, instrument and other large, general-purpose LED displays. The device’s LED channels can operate with an output voltage on the LED pins as low as 0.4V (for 2mA to 100mA LED current), to enable more power-efficient designs. The nominal LED current is set by an external resistor. A high-speed, 4-wire serial interface with up to 25 MHz clock frequency, controls each of the 8 channels using a shift register and latch configuration. A serial output data pin allows multiple devices to be cascaded and programmed via one serial interface. It features a blanking control pin (BLANK), which can be used to disable all channels independently of the interface. Additionally, on-chip thermal shutdown protection disables the LED outputs if the die temperature exceeds a set limit. The CAT4008 is available in a 16-lead, 150 mil SOIC. Pricing starts at $0.49 each in 10,000 piece quantities. Samples are available now. Projected lead-time for production quantities is currently 6 to 8 weeks ARO.
Catalyst Semiconductor, Inc.
Product URL: http://www.catsemi.com/products/CAT4008.asp