Datasheet

Copyright © 2011 Future Technology Devices International Limited 3
Document Reference No.: FT_000204
DB9-USB Datasheet
Version 2.1
Clearance No.: FTDI# 130
1.4 Block Diagrams
FTDI FT232R
USB Serial Bridge
RS232
Level Shifter
USB Mini B
Client
Connector
DB9 PCB
Decal
DB9 Module
DB9 Module
Figure 1.2 – DB9-USB RS232 Level Block Diagram
USB Mini B
Client
Connector
DB9 PCB
Decal
DB9 Module
DB9 Module
VIO
VIO
3.3V
3.3V
3.3V TTL/CMOS
UART
3.3V TTL/CMOS
UART
3V3OUT
3V3OUT
FTDI
FT232R USB
Serial Bridge
FTDI
FT232R USB
Serial Bridge
Figure 1.3 – DB9-USB-D3 Digital Voltage Level Block Diagram
FTDI FT232R
USB Serial Bridge
USB Mini B
Client
Connector
DB9 PCB
Decal
DB9 Module
DB9 Module
VIO
VIO5V
5V
5V TTL/CMOS
UART
5V TTL/CMOS
UART
Figure 1.4 – DB9-USB-D5 Digital Voltage Level Block Diagram
1.4.1 Block description
USB Mini B Client Connector
This connector provides the interface for connection to a USB Host or Hub port.
FTDI FT232R
The FTDI FT232R provides the USB-to-Serial conversion. Operating system device drivers are required in
order to operate with the FT232R to provide the Virtual COM Port serial functionality.
RS232 Level Shifter
The RS232 level shifter converts the signals provided by the FT232R into the voltage levels required by
application RS232 interface.