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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 27/45頁 |
| 文件大?。?/td> | 566K |
| 代理商： | LM9830 |
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When the Resume Scan signal is received, the stepper motor
controller waits the appropriate number of pixel periods after the
next TR pulse and then starts stepping again at the normal rate.
The first new line transmitted is determined by the
Lines to Dis-
card After Resume Scan Signal
register. The discard value
must be the same as the value in the
Lines to Process After
Pause Scan Signal
register.
3.4 Pause Behavior - Reversing Mode
If the
Full Steps to Reverse When Buffer is Full
register is >0,
then the Reversing Mode is enabled.
The Reversing Mode eliminates spacial distortion due to the
pausing of a scan. When the Pause Scan signal is received, the
line currently being processed is completed and stored in RAM
(line “b” in Figure 25). When the scan resumes, ideally the
LM9830 would send out lines “c” and after under the exact same
speed and positional conditions the scanner was in before the
scan stopped (as indicated by the dotted line in Figure 25).
When the Pause Scan signal is received, the LM9830 sends out
the remainder of the line currently being read from the CCD (line
b), and stores the offset (in pixel periods) between the last TR
pulse and the last step. It then stops, reverses, stops, and waits
for the Resume Scan signal. Once Resume Scan is asserted, the
motor controller waits for the previously stored number of pixels
periods, then starts moving forward again, maintaining the same
phase relationship between the TR pulse and the stepper motor
control signals. The result is as if the stepper motor had never
paused.
Stopping, reversing, and resuming forward motion all follow the
curve programmed in the
Acceleration Profile
configuration reg-
ister. There are 3 segments (Stopped, 25%, and 50%), and the
number in each register indicates the number of full steps to stay
at that acceleration. A value of 0 indicates that that segment is to
be skipped. For example, a value of 0 in all three registers would
mean that the motor would instantly reverse when the buffer is
full, then instantly stop after going back the specified number of
lines.
This acceleration profile is used any time the motor is started,
stopped, or reversed.
The acceleration profile for stopping, reversing, stopping, and
going forward again is this:
Full speed forward (1 step = #pixels in
Scanning Step Size
register) until the Pause Scanning signal is received.
50% speed forward for z steps (1 step = 2* #pixels in
Scanning
Step Size
register)
25% speed forward for y steps (1 step = 4*#pixels in
Scanning
Step Size
register)
Stopped for x microsteps (= #pixels in
Scanning Step Size
reg-
ister).
25% speed backward for y steps (1 step = 4*#pixels in
Scan-
ning Step Size
register)
50% speed backward for z steps (1 step = 2* #pixels in
Scan-
ning Step Size
register)
Full speed backward (1 step = #pixels in
Scanning Step Size
register) for number of steps in the
Steps to Reverse
register
50% speed backward for z steps (1 step = 2* #pixels in
Scan-
ning Step Size
register)
25% speed backward for y steps (1 step = 4*#pixels in
Scan-
ning Step Size
register)
Value
Additional Lines to Store in SRAM
0
1
2
...
7
0(a only)
1 (a and b)
2 (a, b and c)
...
7
Figure 22: Lines to Process after Pause Scan Signal
Register
Value
First Line to Transmit After Pause
0
1
2
...
7
b
c
d
...
i
Figure 23: Lines to Discard After Resume Scan Signal
Register
Figure 24:
Stepper Motor Resuming
TR
MicroStep
Pulse
Resume
Scanning
Signal
a
b
c
d
Speed
Register
DAC output
Stop
(x = 0 to 3)
x = number of full step clocks to wait
before reversing motor.
y = number of full steps at 25% of final
speed. Full step period = 4 full step
clocks.
z = number of full steps at 50% of final
speed. Full step period = 4 full step
clocks.
25%
(y = 0 to 3)
50%
(z = 0 to 3)
Figure 26: Acceleration Profile Settings
Figure 25:
Reversing - The Goal
TR
MicroStep
Pulse
Pause
Scanning
Signal
a
b
c
d
MicroStep Pulse
(if motor had not
paused)
e
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM9830VJD | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| LM9830VJD/NOPB | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| LM9830VJDX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9830 36-Bit Color Document Scanner |
| LM9831 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner |
| LM9831CCVJD | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner |
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