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參數(shù)資料
| 型號： | LM9831 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| 中文描述： | LM9831 42位彩色，1200dpi的USB圖像掃描儀 |
| 文件頁數(shù)： | 28/41頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LM9831 |
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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
the trailing edge of the first RS pulse. This mode works for TR1
only, under all TR1 settings (normal and CIS TR1 Timing
modes 1 and 2).
5.3 AFE Operation
The LM9831 supports the following operation modes, controlled
by registers 26 and 27:
3 Channel Pixel Rate Mode. In this mode all three channels are
converted with the multiplexer in front of the ADC switching at
the ADC conversion rate, producing interleaved RGB data that
is transferred to RAM. The ADC runs at MCLK/8, each chan-
nel’s pixel rate is MCLK/24. Each color has its own offset and
gain coefficients. This mode typically uses Illumination Mode 1.
3 Channel Line Rate Mode. In this mode all three channels are
converted with the multiplexer in front of the ADC switching at
the line rate, producing a line of Red data, followed by a line of
Green data, followed by a line of Blue data, etc. that is trans-
ferred to RAM. The selected channel and the ADC both run at
MCLK/8. Each color has its own offset and gain coefficients.
This mode typically uses Illumination Mode 1.
In the 3 Channel Line Rate Mode three TR pulses are generated.
TR
RED
is the TR1 output, TR
is the TR2 output, and
TR
BLUE
is the CP2 output. In this mode TR pulses for a particular
color can be “skipped”, increasing the integration time for that
color. In the example shown in Figure 30, the red channel sees 2
times the integration time of the green channel, and the blue
channel sees 3 times the integration time of the green channel.
Each channel can be independently programmed to drop 0, 1, or
2 TR pulses.
Each color’s TR pulse can be programmed to occur in position 1
(inside 1 high) or position 2 (inside 1 low), as shown in Figure
31.
1 Channel Grayscale: Uses the selected channel’s offset and
gain coefficients for all lines. 1 Channel Grayscale is used to
scan a grayscale images. This mode typically uses Illumination
Mode 1 when used with a 3 Channel Color sensor, or Illumina-
tion Mode 3 when used with a 1 Channel sensor.
Figure 27: Fake Optical Black Pixels
Trailing edge of
first RS pulse
End of Optical
Black Pixels
TR1
RS
Red Channel
Figure 28:
3 Channel Pixel Rate Mode
Green Channel
Blue Channel
ADC
C
C
D
ADC Out LIne 1: RGBRGBRGBRGBRGB...
ADC Out LIne 2: RGBRGBRGBRGBRGB...
ADC Out LIne 3: RGBRGBRGBRGBRGB...
ADC Out LIne 4: RGBRGBRGBRGBRGB...
Pixel-Rate
Multiplexing
Red Channel
Figure 29:
3 Channel Line Rate Mode
Green Channel
Blue Channel
ADC
C
C
D
ADC Out LIne 1: RRRRRRRRRRRRRRR...
ADC Out LIne 2: GGGGGGGGGGGGGG...
ADC Out LIne 3: BBBBBBBBBBBBBBBBB...
ADC Out LIne 4: RRRRRRRRRRRRRRR...
Line-Rate
Multiplexing
Figure 30:
3 Channel Line Rate TR Pulse Timing
TR
RED
TR
GREEN
TR
BLUE
Multiplexer
Channel
Red
Green
Blue
Red
Green
t
INT (RED)
t
INT (GREEN)
t
INT (BLUE)
TR
RED
TR
GREEN
TR
BLUE
1
1
2
1
2
Figure 31:
3 Channel Line Rate Mode with 2 TR
Pulse Positions
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM9831CCVJDX | LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832CCVJD | LM9832 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832 | LM9832 42-Bit Color, 1200dpi USB Image Scanner |
| LM9833CCVJD | LM9833 48-Bit Color, 1200dpi USB Image Scanner |
| LM9833 | LM9833 48-Bit Color, 1200dpi USB Image Scanner |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM9831CCVJD | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9831CCVJDX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9832 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832B-B WAF | 制造商:Texas Instruments 功能描述: |
| LM9832B-E WAF | 制造商:Texas Instruments 功能描述: |
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