Data Sheet

Copyright © 2013 Future Technology Devices International Limited 32
FT231X USB TO FULL HANDSHAKE UART IC
Datasheet
Version 1.2
Document No.: FT_000565 Clearance No.: FTDI# 261
8 Internal MTP Memory Configuration
The FT231X 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
FT231X 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 FT231X can be programmed over USB if the values need to be changed for a
particular application. Further details of this are provided from section 0 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)
0403h
FTDI default VID (hex)
USB Product UD (PID)
6015h
FTDI default PID (hex)
Serial Number Enabled?
Yes
Serial Number
See Note
A unique serial number is generated and
programmed into the MTP memory during device
final test.
Pull down I/O Pins in USB
Suspend
Disabled
Enabling this option will make the device pull down
on the UART interface lines when in USB suspend
mode (PWREN# is high).
Manufacturer Name
FTDI
Product Description
FT231X USB UART
Max Bus Power Current
90mA
Power Source
Bus Powered
Device Type
FT231X
USB Version
0200
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).
Remote Wake Up
Enabled
Taking RI# low will wake up the USB host controller
from suspend in approximately 20 ms.
DBUS Drive Current
Strength
4mA
Options are 4mA, 8mA, 12mA, 16mA
DBUS slew rate
Slow
Options are slow or fast
DBUS Schmitt Trigger
Enable
Normal
Options are normal or Schmitt