USB - RS232, Elektronika, Artykuły

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USBP
Ver 3
FT232 based TTL to RS232 via USB port
The USBP provides an easy method of connecting TTL to RS232 signals on PC via a USB port.
Ideal for microcontroller circuits. The design uses Future Technology Devices Intl Ltd's (FTDI)
FT232BM chip. The FTDI website provides the USB drivers for a virtual com port as well as
Windows DLLs for interfacing with VisualBasic and Visual C, plus other applications.
FT232BM documentation and files are available from their website:
Construction Hints
Assembly of this kit requires that the user has the necessary tools and skills to work with SMD (surface mount device)
components.
If you are not comfortable with soldering miniature parts, then please seek assistance from someone who is capable
to do so.
Small mistakes can cause many frustrating hours of grief in trouble shooting!
Minimum tools required:
A fine point low power (25w max) soldering iron and thin solder. Ideally, 0.020" diameter (or less) silver-bearing non-corrosive
rosin core should be used. In addition. narrow needle nose pliers, diagonal cutting pliers, good quality tweezers, large magnifying
glass, volt-ohm meter, and a 7 to 12 vdc power supply.
Make sure that you work in a clean well lighted area and have adequate desk area. If you have carpeting then please be aware of
static discharge as well as accidentally losing tiny components in the carpets fiber. SMD capacitors and resistors are very tiny and
can quickly become lost in the carpeting.
Disclaimer and Terms of Agreement
As with any kit, only the individual parts supplied are guaranteed against defects and not the user assembled unit. All kit parts
are purchased from reputable sources such as Digikey Inc, Allied Electronics and Mouser Inc, however, should a kit part be
ascertained to be defective it will be replaced at no charge within 30 (thirty) days of the purchase date. Beyond that, COMPSys
Workbench and / or the COMPSys developer(s) assume no liability and WILL NOT be held liable nor be held responsible wholly
or in part for any damages caused by the construction of and / or use of their products sold .
USBP3 doc
(c) COMPSys 2004
USBP3 Parts Layout
USB-Type B
CN1
4
3
12
R2
2.2k
R4
27 27
R5
8
1
IC3
C5
10nf
IC2
9
32
8
1
FB
+
1.5k
10k
R6
R1
C4
C6
33nf
D1
R3
470
D2
IC1
0.1uf
6mhz
16
25
R7
470 470
R8
17
24
X1
Eeprom Pin 1
PCB foil layout
Note: Pin 1 (dot on FT232BM chip)
Parts List Basic Kit
R3,R7,R8 470 ohm
R6 1.5k
R4,R5 27 0hm
C4 33nf
C5 10nf
C6 0.1uf
FB Ferrite bead
D1,D2 LEDs
IC1 FT232BM
X1 6Mhz resonator
CN1 USB-B pcb connector
Enhanced Kit also includes
R1 10k
R2 2.2k
IC2 3.3v Regulator
IC3 Eeprom (93C46 or 93C56)
Recommended Assembly Steps
y
Top side first, carefully orient and mount the FT232 chip
y
Mount capacitors and resistors next**
y
Bottom side, mount Eeprom (note pin 1)*
y
Mount 3.3 reg*
y
Mount capacitors, ferrite bead and resistors**
y
Install the 6mhz resonator
y
Carefully mount and solder the USB-Type B connector
y
Mount headers as needed
y
DOUBLE CHECK ALL COMPONENTS!
Use
solder sparingly
! Apply only tiny
amounts when required on the pcb
pads.
Double check orientation
of all
parts BEFORE soldering.
*Enchanced kit includes 3.3 reg, eeprom and 2 resistors
**The capacitors and ferrite bead do not have any
markings, make sure to identify each before installing.
(c) COMPSys 2004
FT232BM schematic with optional 3.3v reg and eeprom
TXD
RXD
RTS
CTS
TTL RX
TTL TX
TTL CTS
TTL RTS
Typical connections to a
TTL RS232 device or mcu
Note: Schematic may not reflect recent changes
(c) COMPSys 2004
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