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MIC5400 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC5400 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 10 page January 2005 1 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 maxi- mum 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. Typical Application SHFTCLK VDDA VDDB VDD SHIFTIN SHIFTOUT LOAD 0.01µF 2.2µF 2.2µF Output A Logic Control and SRegister Output B BD_A BD_B RSET 330½ 330½ MIC5400 VDD RSC RSC BCP69 BCP69 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 – Output open fault detection with status register readback • Output transitions are staggered to minimize supply transients Applications • Outdoor video screen • Large LED display Ordering Information Part Number Junction Temp. Range Package MIC5400BWM –40°C to +85°C 28-Pin Wide SOIC MIC5400YWM –40°C to +85°C 28-Pin Wide SOIC Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com |
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