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WM8255 Datasheet(PDF) 22 Page - Cirrus Logic

Part # WM8255
Description  Single Channel 16-bit CIS/CCD AFE with RGB LED Current Drive
PDF  49 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8255 Datasheet(HTML) 22 Page - Cirrus Logic

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Production Data
WM8255
w
PD, Rev 4.7, August 2013
22
Figure 15 Relationship between Line Scan Illumination and Video Signal Readout
Two current switching techniques are used for state and PWM transition switching, slew rate
controlled current switching and current steering switching.
With reference to Figure 16, the LED drive current has three blocks, the LED current DAC, the LED
RGB matrix switch and a shunt current path switch.
With reference to Figure 16, for current slew rate controlled switching, the LED current DAC value is
reset from the current value to zero then set to an updated value. Slew rate limited current switch
may be partitioned into four operations:



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