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WM8255 датащи(PDF) 32 Page - Cirrus Logic

номер детали WM8255
подробное описание детали  Single Channel 16-bit CIS/CCD AFE with RGB LED Current Drive
PDF  49 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8255 датащи(HTML) 32 Page - Cirrus Logic

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Production Data
WM8255
w
PD, Rev 4.7, August 2013
32
Figure 24 An Example of How LED Current Limiting Can Be Operated
LED CONTROL WORKED EXAMPLE
As an example of configuring the LED current drive control, consider the scan of a US Letter page
size with the AFE configured to sample at 12 MHz MCLK and 3:1 MCLK:VSMP ratio.
The aim is to calculate LEDPWMPER for the given MCLK frequency to give a PWM frequency of
typically 2.5kHz. Then the number of PWM cycles per line scan is calculated to check that there is
sufficient imaging time and coarse trim range.
Assumptions
MCLK:VSMP ratio
= 3:1
MCLK frequency
= 12MHz
VSMP frequency
= 4MHz
LED Enable counter range
= 2^7 (maximum) PWM clock periods
LED PWM counter range
= 2^12 (maximum) PWM clock periods
Colour Scan Mode
Target blanking period
= 25uSec
Desired PWM frequency
= 2.5kHz
Colour sequence
= red, green, blue
Sensor scan width
= 9 inches
Scan resolution
= 2400 dpi



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