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PDF USB245 Data sheet ( Hoja de datos )
| Número de pieza | USB245 | |
| Descripción | Pinout Information | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de USB245 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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USB245
Res. [1]
Res. [2]
Res. [3]
SD7 [4]
SD6 [5]
SD5 [6]
SD4 [7]
SD3 [8]
SD2 [9]
SD1 [10]
SD0 [11]
GND [12]
[24] VCC
Pinout Information
[23] FILTER_VCC
[22] USB_VCC
[21] DM
[20] DP
[19] GND
[18] TXE#
[17] WRITE
[16] READ#
[15] RESET#
[14] RXF#
[13] RCCLK
Res.
SD(0..7)
RCCLK
RXF#
RESET#
READ#
WRITE
TXE#
DP
DM
USB_VCC
FILTER_VCC
VCC
GND
Reserved, Unconnected. Do not use.
Data Bus. Driven when READ# is asserted.
Data inputs when WRITE is asserted.
Output of the onboard RC Timer.
Active low output. When asserted, receive
data is available, and can be read from FIFO.
Active Low output. Remains low for 140msec
after power-up, then goes high.
Active Low input. When low, the device drives
the current receive FIFO data onto SD0-SD7.
Input that Clocks Data at SD0-SD7 into
transmit FIFO on a High-to-Low transition.
Active Low Output. When asserted, signifies
transmit FIFO space is available.
USB Plus Data Signal.
USB Minus Data Signal.
Input to onboard 5volt power filter.
Output of onboard 5volt power filter.
5 Volt power input.
Ground.
• USB ver1.1 compatible device with
a 384 byte transmit FIFO and 128
Byte receive FIFO.
• Works with FTDI’s Virtual Com
Port (VCP) and D2XX Drivers for
Microsoft Windows.
• Small Size: Surface Mount
Technology allows the device to fit
in standard 24 pin DIP socket.
• Preprogrammed 93C46 EEPROM
with unique USB device information.
• Easy to use 8-bit microcontroller-
microprocessor interface with FIFO
status lines
The USB245 is small, easy to use device with all necessary
timing circuits, and power filtering built in.
Each contains a preprogrammed EEPROM which holds the
device and vendor ID codes.
The 8-bit data bus easily connects to processor data buses.
The two control bus lines (READ# and WRITE) direct data flow
from the device, while two status lines (TXE# and RXF#) give
information about the state of the internal transmit and receive
FIFOs. The status lines can also be used as interrupt sources
for the processor.
The onboard RESET# line is routed externally and can be
used to drive other circuits.
The device can be wired to derive and source power from
the USB bus, or alternatively have power sourced from the
processor interface.
All Trademarks are property of
their respective owners
© 2002 Xylotex
www.xylotex.com
1 page  
asks for the drivers, put the floppy disk sent with the USB245 into the computer’s floppy drive and
tell the setup routine which drive you placed it into (usually A:).
After it has completed setup, you can find the COM port the USB245 has been assigned, by
clicking on: Start ÎSettingsÎControl Panel, then double click the System Icon Î Device
Manager Î Ports (COM &LPT). Here you should see: USB Serial Port (COMn), where n is the
COM port assigned.
Now that it has been found, unplug the USB cable from the PC. Never unplug the cable from
the USB245 end, while the other end is plugged into a PC or USB master..
Wire the 8 data lines and 4 status lines to your preprogrammed microcontroller. You can use
the 5V supply from pin 24, and the GND from pin 12 for you microcontroller. Do NOT tie another
5V source to the USB 5V source. RESET# is also available if needed.
Plug the USB cable back into the PC. The PC should now search for and find the proper driver
software. The PC may ‘freeze’ for about 25 seconds while the software is loaded. The chipset &
driver manufacturer explains that this is normal.
If the example program listed above was downloaded to your embedded processor, you should
be able to open a COM program like PCPlus, choose the correct COM Port, and start typing in
the data entry area and see you characters show up on the screen. If they show up twice, go to
half-duplex mode.
A very simple Basic program
USB VAR BYTE
LOW 8
HIGH 9
REM A Place to store the character
REM I/O 0-7 used for DATA
REM I/O 8 used for WRITE SIGNAL, Start LOW
REM I/O 9 used for READ SIGNAL, Start HIGH
REM I/O 10 used for RXF# input
REM TXE IS NOT CHECKED
10 IF IN10 = 0 THEN
LOW 9
USB=INL
HIGH 9
DIRL=%11111111
HIGH 8
OUTL=USB
LOW 8
DIRL=%00000000
END
GOTO 10
REM IF RXF is LOW, there is a char available
REM make the READ line active LOW
REM read the character
REM deactivate the READ line
REM set PORT for OUTPUT
REM strobe the WRITE line HIGH
REM output the character
REM bring the strobe back LOW LOW
REM set PORT for INPUT
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet USB245.PDF ] | |
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