FT221XQ-R International Semiconductor Technologies, FT221XQ-R Datasheet - Page 33

• Manufacturer Part Number: FT221XQ-R
• Description: Specifications: Applications: * ; Interface: * ; Voltage - Supply: 3.3 V ~ 5 V ; Package / Case: 20-VFQFN Exposed Pad ; Packaging: Digi-Reel
• Manufacturer: International Semiconductor Technologies

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The FT221X 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
FT221X 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 9.1.
The MTP memory in the FT221X can be programmed over USB or over the FT1248 bus if the values need
to be changed for a particular application. Further details of this are provided from section 9.2 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.
9.1 Default Values
The default factory programmed values of the internal MTP memory are shown in Table 9.1.
Pull down I/O Pins in USB
Serial Number Enabled?
Max Bus Power Current
USB Product UD (PID)
USB Vendor ID (VID)
DBUS Drive Current
Manufacturer Name
Product Description
Internal MTP Memory Configuration
Remote Wake Up
DBUS slew rate
Serial Number
Power Source
USB Version
Device Type
Parameter
Strength
Suspend
Copyright © 2013 Future Technology Devices International Limited
FT221X 8-BIT
Bus Powered
See Note
Disabled
Disabled
FT1248
FT221X
0403h
6015h
90mA
Value
0200
FTDI
4mA
Slow
Yes
Enabling this option will make the device pull down
on the UART interface lines when in USB suspend
programmed into the MTP memory during device
Note: The device is a USB 2.0 Full Speed device
Returns USB 2.0 device description to the host.
(12Mb/s) as opposed to a USB 2.0 High Speed
Document No.: FT_000630 Clearance No.: FTDI# 263
A unique serial number is generated and
Options are 4mA, 8mA, 12mA, 16mA
mode (PWREN# is high).
Options are slow or fast
FTDI default VID (hex)
FTDI default PID (hex)
device (480Mb/s).
final test.
Notes
Version 1.2
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