FT234XD-R datasheet(29/37 Pages) FTDI

29 / 37 page

FT234XD USB TO BASIC UART IC

Version 1.2

Document No.: FT_000753 Clearance No.: FTDI#324

Parameter

Value

Notes

Enable

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

Load VCP Driver

Enabled**

Makes the device load the VCP driver interface for

the device.

CBUS0

TXDEN

Default configuration of CBUS0 – Transmit data

enable for RS485

Invert TXD

Disabled

Signal on this pin becomes TXD# if enable.

Invert RXD

Disabled

Signal on this pin becomes RXD# if enable.

Invert RTS#

Disabled

Signal on this pin becomes RTS if enable.

Invert CTS#

Disabled

Signal on this pin becomes CTS if enable.

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.

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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