FT230X USB TO BASIC UART IC
Document No.: FT_000566 Clearance No.: FTDI# 260
Version 1.2
7
Application Examples
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
VCCIO
VCC
1
2
3
4
47pF
5
SHIELD
RESET#
10nF
VCCIO
GND
3V3OUT
47pF
FT230X
Ferrite
Bead
VCC
27R
USBDM
27R
USBDP
VCCIO
TXD
TXD
RXD
RTS#
CTS#
RXD
RTS#
TXDATA
RXDATA
RTS
RS232 LEVEL
CONVERTER
CTS#
CTS
270R
270R
CBUS0
CBUS1
CBUS2
GN
D
SLEEP#
SHDN#
TXLED
RXLED
GND
VCC
100nF
+
4.7uF
GND
VCCIO
100nF
GND
10k
TXD
RXD
RTS#
CTS#
10k
10k
10k
AG
ND
GND
CTS
TXDATA
RTS
RXDATA
5
9
4
8
3
7
2
6
1
10
DB9M
SHIELD
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.
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25
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