Copyright © 2008 Future Technology Devices International Limited 1
Document Reference No.: FT_000065
TTL-232R-PCB TTL TO USB SERIAL CONVERTER PCB Datasheet Version 1.01
Clearance No.: FTDI# 54
1 Description
The TTL-232R-PCB is a USB to TTL serial UART converter PCB incorporating FTDI’s FT232RQ USB to
Serial UART interface IC device which handles all the USB signalling and protocols. The PCB provides a
fast, simple way to connect devices with a TTL level serial interface to USB.
Each TTL-232R_PCB contains a small internal electronic circuit board, utilising the FT232R plus a USB
type-A connector. The FT232R datasheet, DS_FT232R, is available at http://www.ftdichip.com.
The PCB is RoHS compliant at TTL levels of + 5V or + 3.3V.
The PCB is USB powered and USB 2.0 full speed compatible. Each PCB supports a data transfer rate up to
3 Mbaud and supports the FTDIChip-ID™, with a unique USB serial number programmed into the
FT232R. This feature can be used to create a security or password protected file transfer access using the
PCB. Further information and examples on this feature are available at http://www.ftdichip.com under
FTDIChip-ID Projects.
The TTL-232R_PCB requires USB drivers, available free from http://www.ftdichip.com, which are
used to make the FT232R on the PCB appear as a virtual COM port (VCP). This then allows the user to
communicate with the USB interface via a standard PC serial emulation port (for example TTY). Another
FTDI USB driver, the D2XX driver, can also be used with application software to directly access the
FT232R on the PCB though a DLL. This is illustrated in the Figure 1.1.
VCP
TTY
USB
TTL-232R_PCB
Virtual COM Port
Software application access to USB via D2XX
USB
TTY
D2XX
DLL
TTL-232R_PCB
UART SIGNALS
UART SIGNALS
Figure 1.1 Using the TTL-232R-PCB
