Copyright © 2015 Future Technology Devices International Limited

5

FT234XD USB TO BASIC UART IC

Version 1.2

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

Table of Contents

1

Typical Applications...................................................................... 2

1.1

Driver Support .................................................................................... 2

1.2

Part Numbers...................................................................................... 2

1.3

USB Compliant .................................................................................... 3

2

FT234XD Block Diagram ............................................................... 4

3

Device Pin Out and Signal Description.......................................... 7

3.1

12-Pin DFN Package.......................................................................... 7

3.1.1

DFN Package PinOut Description ....................................................................................7

3.2

CBUS Signal Options ........................................................................... 9

4

Function Description................................................................... 11

4.1

Key Features..................................................................................... 11

4.2

Functional Block Descriptions ........................................................... 11

5

Devices Characteristics and Ratings ........................................... 14

5.1

Absolute Maximum Ratings............................................................... 14

5.2

DC Characteristics............................................................................. 15

5.3

MTP Memory Reliability Characteristics ............................................ 19

5.4

Internal Clock Characteristics........................................................... 19

6

USB Power Configurations.......................................................... 20

6.1

USB Bus Powered Configuration ...................................................... 20

6.2

Self Powered Configuration .............................................................. 21

6.3

USB Bus Powered with Power Switching Configuration .................... 22

7

Application Examples ................................................................. 23

7.1

USB to RS232 Converter ................................................................... 23

7.2

USB to RS485 Coverter ..................................................................... 24

7.3

USB to RS422 Converter ................................................................... 25

7.4

USB Battery Charging Detection ....................................................... 26

7.5

LED Interface.................................................................................... 27

8

Internal MTP Memory Configuration........................................... 28

8.1

Default Values .................................................................................. 28

8.2

Methods of Programming the MTP Memory....................................... 29

8.2.1

Programming the MTP memory over USB...................................................................... 29

8.3

Memory Map ..................................................................................... 30

9

Package Parameters................................................................... 31

9.1

DFN-12 Package Mechanical Dimensions .......................................... 31

9.2

DFN-12 Package Markings ................................................................ 32