FT201XQ-R FTDI, FT201XQ-R Datasheet - Page 31

• Manufacturer Part Number: FT201XQ-R
• Description: USB Interface IC USB to I2C IC QFN-16
• Manufacturer: FTDI

Specifications of FT201XQ-R

• Rohs: yes
• Product: USB 2.0
• Data Rate: 12 Mbps, 480 Mbps
• Interface Type: I2C, USB
• Operating Supply Voltage: 2.97 V to 5.5 V
• Operating Supply Current: 6.4 mA to 8.65 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-16
• Tradename: X-Chip

FT201X USB I2C SLAVE IC Datasheet
Version 1.3
Document No.: FT_000627 Clearance No.: FTDI# 264
2
9.2 I
C Interface
2
2
From an I
C point of view, the FT-X behaves as a standard I
C slave. Data transfers take the same form
2
as a standard I
C communication. In addition to reading and writing, there are some other commands
which can be used to determine the status of the device and these are covered in this section and in
further detail in section 9.3.
Note: This section uses 7-bit addressing in the examples. It uses eight characters to describe the seven
address bits and the single read/write bit. For example,
1110 011 1
means address 0x73 with the
Read/Write bit set to 1, and therefore corresponds to a read of address 0x73. Data values are
represented in bytes, for example,
1010 0101
for data value 0xA5.
9.2.1 Addressing
2
The FT-X can be given a custom slave address on the I
C bus. This is stored in MTP memory and can be
2
re-programmed over USB or I
C. Please see the separate MTP Programming information in section 10.
The slave address is used when reading and writing to the device. The FT-X supports both 7-bit and 10-
bit addressing.
The general call address (0000 000 0) is for addressing every device on the bus. Some slaves do not
support the General Call Address though the FT-X devices do support it. They will acknowledge this
address, receive the second byte and interpret it. There are several commands available for this second
byte. The FT-X will support the Software Reset command which is part of the I2C specification as well as
other custom FTDI commands. These are covered in more detail later in the Other I2C Commands
section.
9.2.2 Data Transfers
Reading and Writing
2
For all I
C data transfers to and from the FT-X, the slave address of the FT-X is used. The figure below
shows a typical 7-bit address transfer for each direction.
Figure 9.1: Data transfers using 7-bit addressing
The figure below summarises all of the transfers available (7-bit and 10-bit addressing).
Copyright © 2013 Future Technology Devices International Limited
31