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PDF LM9831CCVJDX Data sheet ( Hoja de datos )
| Número de pieza | LM9831CCVJDX | |
| Descripción | LM9831 42-Bit Color / 1200dpi USB Image Scanner | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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October 1999
N
LM9831 42-Bit Color, 1200dpi USB Image Scanner
General Description
The LM9831 is a complete USB image scanner system on a sin-
gle IC. The LM9831 provides all the functions (image sensor
control, illumination control, analog front end, pixel processing
function image data buffer/DRAM controller, microstepping
motor controller, and USB interface) necessary to create a high
performance color scanner. The LM9831 scans images in 42 bit
color/14 bit gray, and has output data formats for 24 bit color/8
bit gray. The LM9831 supports sensors with pixel counts of up to
16384 pixels x 3 colors (1200 dpi x 13.6 inches).
The LM9831’s low operating and suspend mode supply currents
allow design of USB bus-powered scanners. The only additional
active components required are an external 4Mbit or 16Mbit
DRAM for data buffering and power transistors for the stepper
motor.
Applications
• Color Flatbed Document Scanners
• Color Sheetfed Document Scanners
Features
• 14 bit ADC digitizes at up to 6Mpixels/s (2M RGB pixels/sec).
• Digital Pixel Processing provides 1200, 800, 600, 400, 300,
200, 150, and 100dpi horizontal resolution from a 1200dpi
sensor and 600, 400, 300, 200, 150, 100, 75, and 50dpi
horizontal resolution from a 600dpi sensor.
• Provides 50-2400dpi vertical resolution in 1 dpi increments.
• Pixel rate error correction for gain (shading) and offset errors.
• Supports 4 or 16Mbit external DRAMs.
• Multiple CCD clocking rates allows matching of CCD clock to
scan resolution and pixel depth for maximum scan speed.
• Stepper motor control tightly coupled with image data buffer
management to maximize data transfer efficiency.
• PWM stepper motor current control allows microstepping for
the price of fullstepping.
• USB interface for Plug and Play operation on USB-equipped
computers.
• Serial EEPROM option for custom Vendor and Product IDs.
• Support for USB bus-powered operation.
• Pixel depths of 1, 2, or 4 bits are packed into bytes for faster
scans of line art and low pixel depth images.
• Supports 3 channel CCDs and 1 channel CIS sensors.
• 3 (R, G, and B) 12-bit, user-programmable gamma correction
tables.
• Compatible with a wide range of color linear CCDs and
Contact Image Sensors (CIS).
• Operates with 48MHz external crystal.
• Internal bandgap voltage reference.
• 100 pin TQFP package
Key Specifications
• Analog to Digital Converter Resolution
• Maximum Pixel Conversion Rate
• A4 Color 150dpi scan time
• A4 Color 300dpi scan time
• A4 Color 600dpi scan time
• Supply Voltage
- LM9831
- LM9831 DRAM I/O
• Typical Operating Current Consumption
14 Bits
6MHz
<10 seconds
<40 seconds
<160 seconds
+4.75V to +5.25V
+2.85 to +5.25V
134mA
LM9831 Scanner System Block Diagram
CCD/CIS
Illumination
USB
Port
Optional Serial
EEPROM
22
8 MISC
1-3 I/O
2-6 LM9831CCVJD
1-3 30 DRAM
48MHz Crystal
+24V
Stepper
Motor
Power
Transistors
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
©1999 National Semiconductor Corporation
1
www.national.com
1 page  
AC Electrical Characteristics
The following specifications apply for AGND=DGND=0V, VA=VD=VDRAM=+5.0VDC unless otherwise noted,
fCRYSTAL IN= 48MHz, MCLK DIVIDER = 1.0 (unless otherwise noted), fMCLK = fCRYSTAL IN/MCLK DIVIDER, fADC CLK = fMCLK/8,
CL (databus loading) = 20pF/pin. Boldface limits apply for TA=TJ=TMIN to TMAX; all other limits TA=TJ=25°C. (Notes 8, 9, & 10)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 10)
Units
(Limits)
DRAM Timing (Figure 1)
tRD SETUP Data valid to RD rising edge
tRD HOLD
tWR SETUP
tWR HOLD
Data valid after RD rising edge
Data valid before WR falling edge
Data valid after WR rising edge
VDRAM=5.0V
VDRAM=3.3V
26 ns (min)
35 ns (min)
0 ns (min)
5 ns (min)
10 ns (min)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional,
but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply
only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: All voltages are measured with respect to GND=AGND=DGND=0V, unless otherwise specified.
Note 3: When the input voltage (VIN) at any pin exceeds the power supplies (VIN<GND or VIN>VA or VD), the current at that pin should be limited to 25mA. The 50mA
maximum package input current rating limits the number of pins that can simultaneously safely exceed the power supplies with an input current of 25mA to two.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax, ΘJA and the ambient temperature, TA. The maximum allow-
able power dissipation at any temperature is PD = (TJmax - TA) / ΘJA. TJmax = 150°C for this device. The typical thermal resistance (ΘJA) of this part when board mounted
is 53°C/W.
Note 5: Human body model, 100pF capacitor discharged through a 1.5kΩ resistor. Machine model, 200pF capacitor discharged through a 0Ω resistor.
Note 6: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in any National Semiconductor Linear
Data Book for other methods of soldering surface mount devices.
Note 7: Two diodes clamp the OS analog inputs to AGND and VA as shown below. This input protection, in combination with the external clamp capacitor and the output
impedance of the sensor, prevents damage to the LM9831 from transients during power-up.
VA
OS Input
To Internal
Circuitry
AGND
Note 8: For best performance, it is required that all supply pins be powered from the same power supply with separate bypass capacitors at each supply pin.
Note 9: Typicals are at TJ=TA=25°C, fCRYSTAL IN = 48MHz, and represent most likely parametric norm.
Note 10: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 11: Integral linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that best fits the actual transfer function of the ADC.
Note 12: VREF is defined as the CCD OS voltage for the reference period following the reset feedthrough pulse. VWHITE is defined as the peak CCD pixel output voltage for
a white (full scale) image with respect to the reference level, VREF . VRFT is defined as the peak positive deviation above VREF of the reset feedthrough pulse. The maximum
correctable range of pixel-to-pixel VWHITE variation is defined as the maximum variation in VWHITE (due to PRNU, light source intensity variation, optics, etc.) that the
LM9831 can correct for using its internal PGA.
CCD Output Signal
VRFT VREF
VWHITE
Note 13: PGA Gain Error is the maximum difference between the measured gain for any PGA code and the ideal gain calculated by using the formula
G ai n PG A
VV---
=
G0
+
X
P----G-----A------c---o---d---e--
32
where X
=
( G31
–
G0
)
3----2-
31
.
5 www.national.com
5 Page 
Address
Function
DDDDDDDD
76543210
Value
COMMAND REGISTER
Command Register
This register is used to start and end a scan.
It is also used to home the sensor in a
flatbed scanner or eject the image in a
sheetfed scanner. Note: Always make sure
the Command Register is in the idle state
(=0) before issuing a new command.
07
Standby
When this bit is set the entire chip enters a
low power state.
Warning: A Standby command will stop
DRAM refresh.
Reset
Write a 1 then a 0 to reset the LM9831’s
state machines.
Warning: A Reset will stop DRAM refresh.
MASTER CLOCK DIVIDER
MCLK Divider
This register sets the master clock frequency
08 for the entire scanner.
fMCLK = 48MHz/MCLK_Divider
fADC = fMCLK/8
Idle - Stops motor (A, B, A, B = 0),
0 0 0 completes current line of data (if scanning).
Note: CCD/CIS clocks continue clocking.
High Speed Forward - Moves motor forward at a
0 0 1 speed determined by the Fast Feed Step Size
(registers 48 and 49).
High Speed Reverse - Moves motor backward at a
0 1 0 speed determined by the Fast Feed Step Size
(registers 48 and 49).
0
1
1
Start Scan - Resets the LM9831’s data pointers and
starts an image scan.
Programmed High Speed Forward - Moves motor
1
0
1
forward at a speed determined by the Fast Feed Step
Size (registers 48 and 49) for the number of lines
programmed in registers 4A and 4B.
Programmed High Speed Reverse - Moves motor
1
1
0
backward at a speed determined by the Fast Feed
Step Size (registers 48 and 49) for the number of lines
programmed in registers 4A and 4B.
0 Normal Operation
1 Low Power Standby Mode
0 Normal Operation
1 Resets the LM9831
0 0 0 0 0 0 ÷1.0
0 0 0 0 0 1 ÷1.5
0 0 0 1 1 0 ÷4
a a a a a a ÷ ((aaaaaa/2)+1)
1 1 1 1 1 0 ÷32.0
1 1 1 1 1 1 ÷32.5
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| PDF Descargar | [ Datasheet LM9831CCVJDX.PDF ] | |
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