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IT1502 －
16-Channel PWM-Embedded LED Driver with Current Gain
Description
IT1502 is for LED display applications with an internal 16-bit color
depth Pulse Width Modulation (PWM) control and provides a 16-bit shift
register which converts serial input data into each pixel gray scale of
output port. At IT1502 output port, sixteen regulated current ports are
designed to provide uniform and constant sinking current for driving
LEDs with different Vf variations. The output current can be preset
through an external resistor and can be programmed to 64 gain stages
for LED brightness adjustment.
With the PWM technology, IT1502
converts the “on” time into several “random on” periods. This feature
increases the visual refresh rate equally. When building a 16-bit color
depth video, this PWM reduces the flickers and improves the fidelity.
IT1502 drives the corresponding LEDs to the brightness specified by
image data. IT1502 offloads the signal timing generation of the host
controller which just needs to feed data into drivers. With IT1502, all
output channels can be built with 16-bit color depth (65536 gray
scales). Each LED’s brightness can be calibrated from minimum to
maximum brightness with compensated gamma correction or LED deviation
information inside the 16-bit image data.
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Features
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16
constant-current output channels
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16-bit gray
scale control
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6-bit
linear programmable output current gain
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Constant
output current invariant to load voltage change:
3~45mA@VDD=5V
3~30mA@VDD=3.3V
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Excellent
channel output current accuracy:
between
channels: <±1.5%(typ.), and between ICs: <±3%(typ.)
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Output
current adjusted with an external resistor
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Staggered
delay of output, preventing from current surge
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Maximum
data clock frequency: 30MHz
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Maximum
gray scale clock frequency: 33MHz
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Schmitt
trigger input
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3V~5.5V
Supply Voltage
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Technology
Information:
 Data Sheet
Package:
SSOP-24
QFN-24
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