Copyright © 2013 Future Technology Devices International Limited

29

FT240X USB 8-BIT FIFO IC Datasheet

Version 1.3

Document No.: FT_000626 Clearance No.:

FTDI# 259

Parameter

Value

Notes

DBUS Schmitt Trigger

Enable

Normal

Options are normal or Schmitt

CBUS Drive Current

Strength

4mA

Options are 4mA, 8mA, 12mA, 16mA

CBUS slew rate

Slow

Options are slow or fast

CBUS Schmitt Trigger

Enable

Normal

Options are normal or Schmitt

High Current I/Os

Disabled

Enables the high drive level on the FIFO data bus

and control I/O pins.

Load VCP Driver

Disabled

Enabling this will load the VCP driver interface for

the device.

CBUS5

VBUS_Sense

Used to detect when the device is connected to a

USB host and power is available.

CBUS6

Keep_Awake#

Prevents the device from entering suspend state

when unplugged.

Table 8.1 Default Internal MTP Memory Configuration

8.2 Methods of Programming the MTP Memory

8.2.1 Programming the MTP memory over USB

The MTP memory on all FT-X devices can be programmed over USB. This method is the same as for the

EEPROM on other FTDI devices such as the FT232R. No additional hardware, connections or programming

voltages are required. The device is simply connected to the host computer in the same way that it would

be for normal applications, and the FT_Prog utility is used to set the required options and program the

device.

The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below.

The user guide is also available at this link. Note that the FT-X devices require FT_Prog version 2.5 or

later.

http://www.ftdichip.com/Support/Utilities.htm#FT_Prog

Additionally, D2XX commands can be used to program the MTP memory from within user applications.

For more information on the commands available, please see the D2XX Programmers Guide below.

http://www.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer's_Guide(FT_000071).p

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