MIC5400

MIC5400 Micrel MIC5400 Dual, 8-Output, 14-Bit LED Video Display Driver General Description The MIC5400 consists of 2 banks of 8 LED driver outputs, each output capable of sinking up to 30mA. Each bank is intended to drive 8 LED pixels of the same color. Most applications will use the MIC5400 to drive pixel clusters of 4 LEDs (RRGB.) Typically two red LEDs are used for every one green and blue to compensate for red LED brightness. A single external resistor sets maximum drive current. Use of an external resistor allows different color LED banks to be biased to the same intensity. Brightness control is digitally programmed through the serial interface. Coarse Brightness Control is determined by two 4-bit DACs, one for each driver bank, limiting the full-scale output to a fraction of the maximum value. Additionally, each output has Fine Brightness Control using 10-bit resolution PWM. Groups of drivers can be cascaded in Daisy Chain fashion. Open circuit output faults are detected and can be read back from the internal Status register. Features 2 banks of 8 outputs Output characteristics: Current sink: 30mA – Programmable brightness control Coarse: 4-bit resolution DAC Fine: 10-bit resolution PWM – Resistor sets maximum LED current to compensate variation in LEDs – Current limit on each output Full protection: – Over-temperature shutdown – Watchdog disables output under fault condition – Power-on reset (all LEDs Off) – Soft-start on power up and watchdog recovery ...