- 您現在的位置：買賣IC網 > PDF目錄361036 > LM9833 (National Semiconductor Corporation) LM9833 48-Bit Color, 1200dpi USB Image Scanner PDF資料下載
參數資料
| 型號： | LM9833 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LM9833 48-Bit Color, 1200dpi USB Image Scanner |
| 中文描述： | LM9833 48位彩色，1200dpi的USB圖像掃描儀 |
| 文件頁數： | 34/42頁 |
| 文件大小： | 547K |
| 代理商： | LM9833 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁當前第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁
34
www.national.com
remote wakeup signals (after the device is initialized).
MISC I/O 4-6 are configured as outputs.
10.2 Soft Reset
A Soft Reset is generated by setting bit 5 of register 07. A Soft
Reset:
Stops most of the internal clocks inside the system to save
power.
Does NOT stop 48MHz oscillator.
Resets internal state machines for correct operation after
register changes.
Stops DRAM refresh. This will corrupt all the gamma, offset,
gain values, as well as any image data, stored in the external
DRAM.
Does NOT prevent configuration register read/writes.
The following procedure should be followed to produce a Soft
Reset:
Set register 0x07 to 0x00 (Idle)
Set register 0x18 to 0x18 (disabling sampling)
Set register 0x07 to 0x20 (Reset)
Write original value back into register 0x18, write additional
configuration registers (if desired)
Set register 0x07 to 0x00 (Idle)
10.3 Standby
The LM9833 enters the Standby mode by setting bit 4 of register
07. Standby Mode:
Powers down the analog section to conserve power.
Tristates the stepper motor outputs (regardless of the state of
register 45, bit4).
Does NOT prevent configuration register read/writes.
10.4 Suspend Mode: Entering
Suspend Mode is entered when the USB bus has had no activity
for 3ms. The Suspend state forces the LM9833 into a low current
idle state. Suspend Mode:
Stops the oscillator.
Forces all black-box highlighted configuration registers to their
default settings (including the Reset and Standby bits). See
the Reset and Standby mode descriptions for more
information.
MISC I/O 1-3 will be configured as inputs and can be used as
remote wakeup signals.
10.5 Suspend Mode: Exiting
When the LM9833 exits Suspend Mode:
The oscillator is restarted.
The Reset and Standby bits are still set. The driver software is
responsible for clearing them and setting the configuration
registers again to resume operation. All configuration registers
and DRAM data should be re-written after a Suspend
sequence.
11.0 USEFUL EQUATIONS
The integration time (t
INT
) for 1 line is always:
where pixel_period is the time it takes to clock one pixel out of the
sensor (C = 3 for Pixel Rate Color, and 1 for all other modes):
and line_length is the length of an entire line, measured in units of
pixels. Note that this includes the transfer portion of the line:
These equations apply for any ITA (Integration Time Adjust, Reg-
ister 19) setting.
To maximize scanner throughput, it is desirable to generate data
at the same rate as the digital I/O to the host PC. Under some
conditions (slow digital I/O, or very high resolution scans), the
time to generate one line may be greater than the maximum inte-
gration time. In this case, the integration time may be set to an
acceptable value using the previous equations, and the time to
process a line extended using Register 19 (the ITA function).
Using the ITA function, the time to process 1 line can be extended
to match the digital I/O rate required:
The maximum DRAM write pixel rate allowed is 1MHz. If you con-
figure the LM9833 to generate data any faster then 1Mpixel/s, the
LM9833 will not function correctly. To ensure that the LM9833 is
programmed to a legal datarate, ensure that this constraint is
met:
When using the ITA function (ITA > 0), use this version of the
equation:
Use this equation to calculate the stepsize for a scan:
line_length
=
where vertical_resolution = the desired vertical resolution of the
scan, and FSPI = the number of full steps required to move the
sensor one inch.
When using the ITA function (ITA > 0), use this version of the
equation to compensate for the ITA function:
FSPI
12.0 CHANGES FROM THE LM9831
12.1 FullStep Timeout Function
The LM9833 features a motor step counter that will automatically
stop the scan after a certain number of motor steps. To enable
this mode, set register 58, bit 5 = 0, then program the number of
fullsteps to scan.
12.2 16 Bit Output Mode
The LM9833’s 16 bit output mode is fully functional. It is capable
of scanning any image that the LM9833 can scan at 8 bits, and
does not require any polling of register 01.
tINT
pixel_period line_length
=
pixel_period
mcl48MHz
=
line_length
line_end
TR_time
+
=
tLINE
1+ ITA
(
)
tINT
=
mclk_divider HDPI_divider
6
≥
mclk_divider HDPI_divider ITA
6
≥
scan_stepsize
vertical_resolution
FSPI
4
scan_stepsize
vert_res
4
line_length
-ITA
1
+
(
)
ITA
=
Applications Information
(Continued)
L
相關PDF資料 |
PDF描述 |
|---|---|
| LM98501CCVBH | 10-Bit, 27 MSPS Camera Signal Processor |
| LM98501 | 10-Bit, 27 MSPS Camera Signal Processor |
| LMC555CBPEVAL | CMOS Timer |
| LMC555CN | CMOS Timer |
| LMC555 | CMOS Timer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM9833B-F WAF | 制造商:Texas Instruments 功能描述: |
| LM9833CCVJD | 制造商:Texas Instruments 功能描述:USB Image Scanner 100-Pin TQFP |
| LM9833CCVJD NOPB | 制造商:Texas Instruments 功能描述:Bulk |
| LM9833CCVJD/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 |
| LM98501 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-Bit, 27 MSPS Camera Signal Processor |
發布緊急采購，3分鐘左右您將得到回復。