FT232R datasheet(27/43 Pages) FTDI

27 / 43 page

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.07

Clearance No.: FTDI# 38

7 Application Examples

The following sections illustrate possible applications of the FT232R. The illustrations have omitted pin

numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ package

options.

7.1 USB to RS232 Converter

FT232R

GND

100nF

VCC

USBDM

USBDP

VCCIO

RESET#

OSCI

OSCO

3V3OUT

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

GND

SHIELD

GND

100nF

4.7uF +

10nF +

Ferrite Bead

VCC

SLEEP#

GPIO2

GPIO3

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#

Figure 7.1 Application Example showing USB to RS232 Converter

An example of using the FT232R as a USB to RS232 converter is illustrated in Figure 7.1. In this

application, a TTL to RS232 Level Converter IC is used on the serial UART interface of the FT232R to

convert the TTL levels of the FT232R to RS232 levels. This level shift can be done using the popular “213”

series of TTL to RS232 level converters. These “213” devices typically have 4 transmitters and 5 receivers

in a 28-LD SSOP package and feature an in-built voltage converter to convert the +5V (nominal) VCC to

the +/- 9 volts required by RS232. A useful feature 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 Sipex SP213EHCA which is capable of RS232 communication at up

to 500k baud. If a lower baud rate is acceptable, then several pin compatible alternatives are available

such as the Sipex SP213ECA, the Maxim MAX213CAI and the Analogue Devices ADM213E, which are all

suitable for communication at up to 115.2k baud. If a higher baud rate is required, the Maxim

MAX3245CAI device is capable of RS232 communication rates up to 1Mbaud. Note that the MAX3245 is

not pin compatible with the 213 series devices and that the SHDN pin on the MAX device is active high

and should be connect to PWREN# pin instead of SLEEP# pin.

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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