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參數(shù)資料
| 型號： | LM9830VJDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | LM9830 36-Bit Color Document Scanner |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 44/45頁 |
| 文件大小： | 566K |
| 代理商： | LM9830VJDX |
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74HCT373
To
Computer
To
Printer
D
D
5
8
LM9830
Databus
Control Signals
Printer Passthrough Block Diagram
TRISTATE
LATCH
5
5
4
4
4
BIAS
V
PASSTHROUGH
Notes:
V
PASSTHROUGH
is generated by rectifying the control outputs from the PC and printer parallel ports. If needed, the 8 bit data lines
may be rectified as well to provide additional current.
If the LM9830’s TRISTATE output is not forced to ground when the LM9830 power is off, then it needs a pulldown resistor to
ground.
The 74HCT373 needs to pass 4 lines from the PC to the printer, the 74HCT244 controls 5 lines from the printer to the PC. The
latch is needed to hold the 4 inputs to the printer in the state they were in before the LM9830 left the transparent mode. It is possi-
ble that a simple tristate buffer (74HCT244) could be used instead of the latch, with pullups/pulldowns defining the signals sent to
the printer when the LM9830 is active. It is also possible that one signal (probably INIT) could always be simultaneously connected
to the printer port and the LM9830, allowing just one 74HCT244 to implement the printer passthrough function.
The final recommended schematic for this mode is an applications issue and will be determined after testing with final silicon.
The design requirements are:
Scanner Active
PassThrough
LM9830 Power Off
TRISTATE
+5V
0V
0V (through pulldown, if necessary)
LATCH
0V
5V
5V (through pullup) (latches previous states)
D0-D7
LM9830 sends/receives
Tristate
Tristate
STROBE, AUTOFEED,
Inputs to LM9830
Tristate
Tristate
SELECT IN, INIT
ACK, BUSY, PE,
LM9830 Outputs
Tristate
Tristate
SELECT, ERROR
74HCT244
+5V from Scanner Power Supply
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LM9832 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9832 42-Bit Color, 1200dpi USB Image Scanner |
| LM9832B-B WAF | 制造商:Texas Instruments 功能描述: |
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