db9-usb Future Technology Devices International Ltd., db9-usb Datasheet - Page 4

• Manufacturer Part Number: db9-usb
• Description: The Db9-usb Family Of Usb To Uart Converter Modules
• Manufacturer: Future Technology Devices International Ltd.

1.4
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.
Block Diagrams
USB Mini B
USB Mini B
Connector
USB Mini B
Connector
Connector
Client
Client
Client
Figure 1.3 – DB9-USB-D3 Digital Voltage Level Block Diagram
Figure 1.4 – DB9-USB-D5 Digital Voltage Level Block Diagram
Copyright © 2011 Future Technology Devices International Limited
Figure 1.2 – DB9-USB RS232 Level Block Diagram
USB Serial Bridge
FTDI FT232R
3.3V
5V
3.3V
5V
3V3OUT
VIO
VIO
USB Serial Bridge
VIO
3V3OUT
VIO
FTDI FT232R
FT232R USB
Serial Bridge
DB9 Module
DB9 Module
DB9 Module
FT232R USB
Serial Bridge
DB9 Module
DB9 Module
DB9 Module
FTDI
FTDI
Level Shifter
RS232
3.3V TTL/CMOS
5V TTL/CMOS
3.3V TTL/CMOS
5V TTL/CMOS
UART
UART
UART
UART
Document Reference No.: FT_000204
DB9 PCB
DB9 PCB
DB9 PCB
Decal
Decal
Decal
Clearance No.: FTDI# 130
DB9-USB Datasheet
Version 2.1
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