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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 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.
Typical Application
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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
