FT231XQ-R datasheet(25/45 Pages) FTDI

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FT231X USB TO FULL HANDSHAKE UART IC

Datasheet

Version 1.2

Document No.: FT_000565 Clearance No.:

FTDI# 261

7 Application Examples

The following sections illustrate possible applications of the FT231X. The illustrations have omitted pin

numbers for ease of understanding since the pins differ between the FT231XS and FT231XQ package

options.

7.1 USB to RS232 Converter

FT231X

SHIELD

Ferrite

Bead

GND

VCC

GND

VCC

3V3OUT

USBDM

USBDP

VCCIO

VCC

RESET#

100nF

10nF

4.7uF

SLEEP#

CBUS1

CBUS2

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

TXDATA

RXDATA

RTS

CTS

DTR

DSR

DCD

TXLED

RXLED

VCC

270R

GND

DTR

CTS

TXDATA

RTS

RXDATA

DSR

DCD

DB9M

SHIELD

SHDN#

CBUS0

TXD

RXD

RTS#

CTS#

DTR#

RI#

DCD#

DSR#

27R

GND

47pF

NOTE: If design uses VCCIO < 3V3 then 10k pullup to VCCIO is required on IO lines

Figure 7.1 Application Example showing USB to RS232 Converter

An example of using the FT231X 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 FT231X to

convert the 3V3 levels of the FT231X 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 CBUS0 and CBUS1 have been configured as TXLED# and RXLED# and are being

used to drive two LEDs.

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