Document Reference No.: FT_000065
TTL-232R-PCB TTL TO USB SERIAL CONVERTER PCB Datasheet Version 1.01
Clearance No.: FTDI# 54
Appendix A - PCB EEPROM Configuration
Each TTL-232R-PCB is controlled by the FTDI FT232R IC. This FT232R device contains an EEPROM which
contains the USB configuration descriptors for that device. When the PCB is plugged into a PC or a USB
reset is performed, the PC will read these descriptors. The default values stored into the internal EEPROM
are defined in Table 0.1 Default Internal EEPROM Configuration
Parameter
Value
0403h
6001h
Yes
Notes
FTDI default VID (hex)
FTDI default PID (hex)
USB Vendor ID (VID)
USB Product UD (PID)
Serial Number Enabled?
Serial Number
A unique serial number is generated and programmed into
the EEPROM during device final test.
See Note
Enabling this option will make the device pull down on the
UART interface lines when the power is shut off (PWREN#
is high).
Pull down I/O Pins in USB
Suspend
Disabled
Manufacturer Name
Product Description
Max Bus Power Current
Power Source
FTDI
See note
90mA
TTL-232R-PCB
Bus Powered
FT232R
Device Type
Returns USB 2.0 device description to the host.
Note: The device is be a USB 2.0 Full Speed device
(12Mb/s) as opposed to a USB 2.0 High Speed device
(480Mb/s).
USB Version
0200
Remote Wake Up
High Current I/Os
Load VCP Driver
Invert TXD
Disabled
Enabled
Enabled
Disabled
Disabled
Disabled
Disabled
Enables the high drive level on the UART and CBUS I/O
pins.
Makes the device load the VCP driver interface for the
device.
Signal on this pin becomes TXD# if enable.
Signal on this pin becomes RXD# if enable.
Signal on this pin becomes RTS if enable.
Signal on this pin becomes CTS if enable.
Invert RXD
Invert RTS#
Invert CTS#
Table 0.1 Default Internal EEPROM Configuration
The internal EEPROM on the PCB can be re-programmed over USB using the utility program FT_PROG.
FT_PROG can be downloaded from the www.ftdichip.com. Version 2.8a or later is required for the FT232R
chip. Users who do not have their own USB Vendor ID but who would like to use a unique Product ID in
their design can apply to FTDI for a free block of unique PIDs. Contact FTDI support for this service.
Copyright © 2008 Future Technology Devices International Limited
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