參數(shù)資料
型號(hào)： LM9832CCVJD
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費(fèi)家電
英文描述： LM9832 42-Bit Color, 1200dpi USB Image Scanner
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁數(shù)： 34/42頁
文件大?。?/td> 337K
代理商： LM9832CCVJD
34
www.national.com
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.
10.3 Standby
The LM9832 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 LM9832 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 LM9832 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 LM9832 to generate data any faster then 1Mpixel/s, the
LM9832 will not function correctly. To ensure that the LM9832 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 LM9832 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 14 Bit Output Mode
The LM9832’s 14 bit output mode is fully functional. It is capable
of scanning any image that the LM9832 can scan at 8 bits, and
does not require any polling of register 01.
12.3 Steps to Reverse Register Increased
To improve performance with some mechanical designs, the
number of bits in register 50 was increased from 6 to 8 bits. This
allows the scanner to reverse up to 255 steps when pausing due
to a buffer full condition.
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
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