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6. Internal EEPROM Configuration
Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB configuration
descriptors stored there. The default values programmed into the internal EEPROM in the FT232RQ used in the TTL-
232R are shown in Table 2.
Table 4 - Default Internal EEPROM Configuration
Parameter
Value
Notes
USB Vendor ID (VID)
0403h
FTDI default VID (hex)
USB Product ID (PID)
Serial Number Enabled?
Serial Number
6001h
Yes
FTDI default PID (hex)
See Note
A unique serial number is generated and programmed into the EEPROM
during final test of the TTL-232R module.
Pull Down I/O Pins in USB Suspend
Disabled
Enabling this option will make the device pull down on the UART interface
lines when the power is shut off (PWREN# is high)
Manufacturer Name
Manufacturer ID
Product Description
Max Bus Power Current
Power Source
FTDI
FT
TTL232R
90mA
Bus Powered
FT232R
0200
Device Type
USB Version
Returns USB 2.0 device descriptor 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).
Remote Wake up
High Current I/Os
Load VCP Driver
Invert TXD
Disabled
Enabled
Enabled
Disabled
Disabled
Disabled
Disabled
RI# pin is not available, so this option has been 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 enabled.
Invert RXD
Signal on this pin becomes RXD# if enabled.
Invert RTS#
Signal on this pin becomes RTS if enabled.
Invert CTS#
Signal on this pin becomes CTS if enabled.
The internal EEPROM in the FT232R can be reprogrammed over USB using the utility program MPROG. MPROG
can be downloaded from the FTDI website. 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.
TTL-232R USB to TTL Serial Converter Cable
Datasheet Version 1.0
© Future Technology Devices International Ltd. 2006
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
