FT201XS-R datasheet(36/49 Pages) FTDI

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FT201X USB I2C SLAVE IC Datasheet

Version 1.4

Document No.: FT_000627 Clearance No.: FTDI# 264

Parameter

Value

Notes

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

Disabled

Enabling this will load the VCP driver interface for

the device.

I2C Address

22h

The I2C device address

CBUS0

SLEEP#

Default configuration of CBUS0 – USB suspend mode.

CBUS1

TRI-STATE

Default configuration of CBUS1 – TRI-STATE.

CBUS2

TRI-STATE

Default configuration of CBUS2 – TRI-STATE

CBUS3

PWREN#

Default configuration of CBUS3 – Power enable. Low

after USB enumeration, high during USB suspend

mode.

CBUS4

VBUS_Sense

Default configuration of CBUS4– Power enable. Low

after USB enumeration, high during USB suspend

mode.

CBUS5

Keep_Awake#

Prevents the device from entering suspend state

when unplugged. May be used if programming the

MTP memory over I2C.

Table 10.1 Default Internal MTP Memory Configuration

Note: These values apply to Revision D and later. The previous revisions had different CBUS defaults.

10.2 Methods of Programming the MTP Memory

10.2.1

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

10.2.2

Programming the MTP memory over I2C

In the FT201X device, it is possible to program the MTP memory over its I2C interface. This is the same

interface which is used in the normal application of the FT201X and would normally be connected to the

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