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MIC5400
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.
Micrel
MIC5400
Dual, 8-Output, 14-Bit LED Video Display Driver
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
MIC5400BWM
MIC5400YWM
Junction Temp. Range
–40 ° C to +85 ° C
–40 ° C to +85 ° C
Package
28-Pin Wide SOIC
28-Pin Wide SOIC
Typical Application
Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com
January 2005
1
MIC5400
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