FT240X USB 8-BIT FIFO IC Datasheet
Version 1.3
Document No.: FT_000626 Clearance No.: FTDI# 259
8 Internal MTP Memory Configuration
The FT240X includes an internal MTP memory which holds the USB configuration descriptors, other
configuration data for the chip and also user data areas. Following a power-on reset or a USB reset the
FT240X will scan its internal MTP memory and read the USB configuration descriptors stored there.
In many cases, the default values programmed into the MTP memory will be suitable and no re-
programming will be necessary. The defaults can be found in Section 8.1.
The MTP memory in the FT240X can be programmed over USB if the values need to be changed for a
particular application. Further details of this are provided from section 8.2 onwards.
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. See TN_100 – USB Vendor ID/Product ID
Guidelines for more details.
8.1 Default Values
The default factory programmed values of the internal MTP memory are shown in Table 8.1.
Parameter
Value
Notes
USB Vendor ID (VID)
USB Product UD (PID)
Serial Number Enabled
0403h
6015h
Yes
FTDI default VID (hex)
FTDI default PID (hex)
A unique serial number is generated and
programmed into the MTP memory during device
final test.
Serial Number
See Note
Disabled
Enabling this option will make the device pull down
on the FIFO interface lines when in USB suspend
mode (PWREN# is high).
Pull down I/O Pins in USB
Suspend
Manufacturer Name
Product Description
Max Bus Power Current
Power Source
FTDI
FT240X USB FIFO
90mA
Bus Powered
FT240X
Device Type
Returns USB 2.0 device description to the host.
Note: The device is a USB 2.0 Full Speed device
(12Mb/s) as opposed to a USB 2.0 High Speed
device (480Mb/s).
USB Version
0200
Taking SIWU# low will wake up the USB host
controller from suspend in approximately 20 ms.
When enabled.
Remote Wake Up
Disabled
DBUS Drive Current
Strength
4mA
Slow
Options are 4mA, 8mA, 12mA, 16mA
Options are slow or fast
DBUS slew rate
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