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FT201X USB I2C SLAVE IC Datasheet

Version 1.4

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

The User Memory Areas are highlighted in Green on the memory map. They can be read and written via

both USB and I2C. All locations within this range are freely programmable; no areas have special

functions and there is no checksum for the user area.

Note that the application should take into account the specification for the number of write cycles in

Section 6.4 if it will be writing to the MTP memory multiple times.

Configuration Memory Area (writable)

This area stores the configuration data for the device, including the data which is returned to the host in

the configuration descriptors (e.g. the VID, PID and string descriptions) and also values which set the

hardware configuration (the signal assigned to each CBUS pin for example).

These values can have a significant effect on the behaviour of the device. Steps must be taken to ensure

that these locations are not written to un-intentionally by an application which is intended to access only

the user area.

This area is included in a checksum which covers configuration areas of the memory, and so changing

any value can also cause this checksum to fail.

Configuration Memory Area (non-writable)

This is a reserved area and the application should not write to this area of memory. Any attempt to write

these locations will fail.

10.4 Hardware Requirements

The hardware is the same as for a typical USB-I2C application and no additional hardware or

programming voltages are required. The I2C connections are the same as shown in Section 8.1. For the

USB connections, either a bus-powered configuration (see Section 7.1 and 7.3) or a self-powered

configuration (see Section 7.2) could be used.

10.5 Protocol

The I2C MTP memory protocol consists of 3 commands:



Address MTP memory (0x10)



Write MTP memory (0x12)



Read MTP memory (0x14)

For further details on the I2C protocol, refer to section 5.

10.5.1

Address MTP memory (0x10)

This consists of a general call with a command phase followed by 2 data bytes which represent the MTP

memory address allowing users to address, potentially, up to 64K byte addresses.

10.5.2

Write MTP memory (0x12)

This consists of a general call with a command phase followed by 1 data byte which shall be programmed

into the MTP memory at the address location set by the MTP memory address command.

10.5.3

Read MTP memory (0x14)

This consists of a general call with a command phase followed by 1 data byte which is the data read from

the MTP memory at the address location set by the MTP memory address command.

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