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參數資料
| 型號： | LM9830VJD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | EuroDOCSIS 2.0 Diplexer Filter w/surge protection |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數： | 26/45頁 |
| 文件大?。?/td> | 566K |
| 代理商： | LM9830VJD |
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the 2 bit DAC, shown in Figure 17.
3.2 MicroStep Mode
Microstepping is a technique of driving the stepper motor with a
staircase approximation of a sine wave, as shown in Figure 18.
This technique maximizes the torque of a given motor, resulting in
a higher maximum speed. In addition, it increases the resolution
of the stepper motor. If a stepper motor moves 3.6° per full step,
microstepping can create positions inside the 3.6°: 1.8°, 0.9°, or
0.45°, for example. This increases the maximum vertical resolu-
tion of the scanner. Microstepping also results in quieter motor
movement.
The amplitude of the microstepped sine wave is controlled by the
output of the stepper motor DAC (Figure 19). The current in the
stepper motor winding is measured as a voltage across the sense
resistor, and the transistor drive signals are pulse width modu-
lated (PWM) to force the average current through the winding
equal to V
/R
. Register 56 controls the frequency of the
PWM, and Register 57 controls the minimum time the driver is on
every period. Register 57 should be set as short as possible, the
driver only needs to be on long enough to mask any transient
noise generated by the driver transistor turning on.
Figure 20 shows the LM9830’s DAC voltages. The peak current
through the stepper motor winding will be 0.5V/R
SENSE
. The table
index is incremented every microstep (StepSize pixel periods).
3.3 Pause Behavior - Non-Reversing Mode
When the
Full Steps to Reverse When Buffer is Full
register is
0, the stepper motor simply stops moving when the Pause signal
is received, as shown in Figure 21. The line of data currently
being processed (section “a” in Figure 21) will continue to be pro-
cessed and stored in SRAM. Additional lines may be digitized and
stored as well, depending on the number programmed in the
Lines to Process After Pause Scan Signal
register (Figure 22).
This value is different for different scanner designs and should be
empirically set to the value that minimizes the spacial distortion
created by the motor slowing down and stopping.
Scan Mode
DAC Voltage
Starting from
a dead stop
0.5V for number of steps specified in
Kickstart Steps
register (0-7). If
register is 0 there is no kickstart
current - movement begins at 0.35V.
0.35V
0.125V for number of steps specified
in
Hold Current Timeout
register
(0 - 31), 0V after time out. If register
is 0 there is no hold current.
Scanning
Stopped
Figure 17:
Full Step Current Control
Figure 18:
Bipolar Microstepping Waveform
A
B
B
A
1 microstep
Table Code
A (B)
A (B)
DAC Voltage
0
1
2
3
4
-0
-1
-2
-3
-4
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
N/A
0.191V
0.353V
0.462V
0.500V
N/A
0.191V
0.353V
0.462V
0.500V
Figure 20:
Microstepping Current Control
Figure 19:
Stepper Motor Waveform - LM9830 Signals
A
B
B
A
DAC A
DAC B
Figure 21:
Stepper Motor Stopping
TR
MicroStep
Pulse
Pause
Scanning
Signal
a
b
c
d
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相關代理商/技術參數 |
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| LM9830VJD/NOPB | 功能描述:視頻模擬/數字化轉換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉換器數量:1 ADC 輸入端數量:4 轉換速率:3 Gbps 分辨率:8 bit 結構: 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 |
| LM9831CCVJDX | 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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