FT201XS-R datasheet(37/49 Pages) FTDI

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FT201X USB I2C SLAVE IC Datasheet

Version 1.4

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

I2C master implemented in a microcontroller (MCU) or FPGA. However, special commands can also be

used to access the MTP memory in the FT201X over the same I2C connection, allowing the MCU/FPGA to

read and write locations in the MTP memory. No additional hardware, connections or programming

voltages are required.

Two examples where it may be desired to use the I2C interface to write and read the MTP Memory are

given below. In some cases, the application may use both of these possibilities.

1. To store and retrieve application specific data such as calibration constants in the user area (e.g.

if the overall application was an analog measurement system). This can avoid the need for an

extra EEPROM chip on the application board.

2. To read and write the configuration data (e.g. custom VID, PID, description strings or CBUS

signal selection to enable signals for battery charging etc) without a USB host. This could allow an

MCU/FPGA to configure the FT201X during production testing of the finished device or even when

in use in the field.

The information in the rest of this chapter can be used to implement the storing and reading of

application data in the user area as in example 1 above. Example 2 requires details of the configuration

data stored in the MTP memory. Further details can be found in the following application note:

http://www.ftdichip.com/Support/Documents/AppNotes/AN_201_FT-

X%20MTP%20Memory%20Configuration.pdf

10.3 Memory Map

The FT-X family MTP memory has various areas which come under three main categories:



User Memory Area



Configuration Memory Area (writable)



Configuration Memory Area (non-writable)

Memory Area Description

Word Address

User Memory Area 2

Accessible via USB, I2C and FT1248

0x3FF - 0x80

Configuration Memory Area

Accessible via USB, I2C and FT1248

0x7E - 0x50

Configuration Memory Area

Cannot be written

0x4E - 0x40

User Memory Area 1

Accessible via USB, I2C and FT1248

0x3E - 0x12

Configuration Memory Area

Accessible via USB, I2C and FT1248

0x10 - 0x00

Figure 10.1: Simplified memory map for the FT201X

User Memory Area

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