DS_FT230X Datasheet, PDF (25/44 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

7 Application Examples
FT230X USB TO BASIC UART IC
Version 1.2
Document No.: FT_000566 Clearance No.: FTDI# 260
The following sections illustrate possible applications of the FT230X. The illustrations have omitted pin
numbers for ease of understanding since the pins differ between the FT230XS and FT230XQ package
options.
7.1 USB to RS232 Converter
1
2
3
4
5
SHIELD
Ferrite
Bead
47pF
VCC
27R
27R
47pF
10nF
GND
GND
VCC
USBDM
USBDP
TXD
RXD
RTS#
CTS#
FT230X
RESET#
VCCIO
3V3OUT
CBUS0
CBUS1
CBUS2
100nF
VCC
+
4.7uF
GND
100nF
VCCIO
TXD
RXD
RTS#
CTS#
SLEEP# _SHDN#
VCCIO
TXDATA
RXDATA
RTS
CTS
270R
VCCIO
270R
TXLED
RXLED
GND
TXD
RXD
RTS#
CTS#
10k 10k 10k 10k
GND
5
9
4
CTS
TXDATA
RTS
RXDATA
8
3
7
2
6
1
SHIELD
DB9M
10
Figure 7.1 Application Example showing USB to RS232 Converter
An example of using the FT230X as a USB to RS232 converter is illustrated in Figure 7.1. In this
application, a 3V3 TTL to RS232 Level Converter IC is used on the serial UART interface of the FT230X to
convert the 3V3 levels of the FT230X to RS232 levels. This level shift can be done using line drivers from
a variety of vendors e.g. Zywyn. A useful feature on some of these devices is the SHDN# pin which can
be used to power down the device to a low quiescent current during USB suspend mode.
A suitable level shifting device is the Zywyn ZT3243F which is capable of RS232 communication at up to
1000k baud.
In example shown, the CBUS1 and CBUS2 have been configured as TXLED# and RXLED# and are being
used to drive two LEDs.
Copyright © 2013 Future Technology Devices International Limited
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