參數(shù)資料
型號(hào)： LM9830
廠商： National Semiconductor Corporation
英文描述： LM9830 36-Bit Color Document Scanner
中文描述： LM9830 36位彩色文件掃描儀
文件頁(yè)數(shù)： 29/45頁(yè)
文件大?。?/td> 566K
代理商： LM9830
29
http://www.national.com
timing is shown in Figure 29, and in slightly more detail in Figure
41.
Illumination Mode 3 is similar to Illumination Mode 2, except that
the LAMP outputs for all three colors are turned on and off every
line. Illumination Mode 3 timing is shown in Figures 30 and 31.
These modes are in operation whenever the chip is powered on
and not in standby mode. For example, the LAMP outputs in Fig-
ures 29 and 30 keep pulsing whether the LM9830 is in the Idle,
Paper Feed, or Scanning states. This eliminates light amplitude
variations due to the lamp/LEDs warm-up characteristics. Since
the LAMP pulses are synchronized to the TR pulse, which is
determined by the horizontal pixel counter, this means that the
pixel counter is constantly running, and any new scans can only
be started by waiting for the next new line (the next Red line in the
case of Illumination Mode 2).
4.2 CCD/CIS Control Block
This function generates the clock signals necessary to control a
CCD or CIS sensor. The LM9830 features:
Independent control over the polarity (inverting or noninverting)
of the input stage to accommodate CIS or CDS signals.
Ability to turn off CDS. When CDS is on, traditional CDS is per-
formed. When CDS is off, the signal is sampled at the Sample
Signal point, but the internal reference is used for the Sample
Reference voltage (not a point on the input signal itself).
The CP1 output supplies the CP pulse needed on some popu-
lar Toshiba CCDs. This looks and acts just like another, inde-
pendent RS pulse.
A CP2 output is another independent pixel rate pulse that (if
needed) can be programmed to supply an additional clock.
CCD clock signals RS, CP1, CP2 are reset when Line Ends
The internal Clamp signal is reset with Optical Black Pixels End.
TR1 and TR2 pulse widths are always the same width, as deter-
mined by Register 0E.
The TR-1 guardband may be equal to 0, causing TR and 1
to go high simultaneously and low simultaneously (Figure 32).
This is a requirement of some Canon CIS sensors.
CIS TR1 Timing Mode 1. In this mode the TR1 pulse is exactly
one clock long, occurring on the rising edge of 1. The TR1
pulse width and guardband settings are ignored. For Dyna CIS.
CIS TR1 Timing Mode 2. In this mode the TR pulse is again
equal to 1 period, but now it is centered around 1. The TR
pulse width and guardband settings are ignored. For Canon
CIS.
To prevent sensor saturation, the LM9830 is always clocking the
CCD/CIS, except when it is in Reset or Standby (Register 7 bit
2 or 3 = 1).
There is a bit for
Fake Optical Black Pixels
(register 19, bit 2).
This is used with Dyna CIS sensors. In this mode, the RS out-
put pulses once inside the TR1 pulse, then is held high until the
end of the optical black pixels. The TR1 pulse is extended until
Figure 29:
Illumination Mode 2
TR
LAMP
G
LAMP
B
LAMP
R
Figure 30:
Illumination Mode 3 (grayscale)
TR
LAMP
G
LAMP
B
LAMP
R
Figure 31:
Illumination Mode 3 (green only)
TR
LAMP
G
LAMP
R
(LAMP
R
On > Line End, LAMP
R
Off < Line End
LAMP
B
(LAMP
B
On > Line End, LAMP
B
Off < Line End
TR Pulse same as first clock pulse
Figure 32:
TR-1Guardband Can Be Equal To 0
TR
1
Figure 33:
CIS TR1 Timing Mode 1
Dummy
Pixels
RS
TR1
1
Transfer
Phase
Previous
Line
1 inside TR1 pulse
Figure 34:
CIS TR1 Timing Mode 2
TR1
1
t
1
/4
t
1
/4
t
1
/4
t
1
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