FT231XS-R FTDI, FT231XS-R Datasheet - Page 25

• Manufacturer Part Number: FT231XS-R
• Description: USB Interface IC USB to Full Serial UART IC SSOP-20
• Manufacturer: FTDI

Specifications of FT231XS-R

• Rohs: yes
• Product: USB 2.0
• Data Rate: 12 Mbps, 480 Mbps
• Interface Type: UART, USB
• Operating Supply Voltage: 2.97 V to 5.5 V
• Operating Supply Current: 8 mA to 8.4 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-20
• Tradename: X-Chip

7
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
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.
NOTE: If design uses VCCIO < 3V3 then 10k pullup to VCCIO is required on IO lines
Application Examples
SHIELD
5
1
2
3
4
Copyright © 2013 Future Technology Devices International Limited
100nF
GND
10nF
Ferrite
Bead
47pF
VCC
+
GND
4.7uF
GND
VCC
47pF
GND
27R
27R
FT231X USB TO FULL HANDSHAKE UART IC
100nF
USBDM
VCC
USBDP
3V3OUT
RESET#
VCCIO
FT231X
Document No.: FT_000565 Clearance No.:
CBUS2
CBUS0
CBUS1
DCD#
DTR#
DSR#
RTS#
CTS#
RXD
TXD
RI#
SLEEP#
DCD#
RTS#
CTS#
DTR#
DSR#
RXD
TXD
RI#
RXDATA
TXDATA
DCD
DTR
DSR
CTS
RTS
SHDN#
RI
GND
SHIELD
RI
7
2
6
1
TXDATA
RTS
CTS
DTR
DSR
DCD
5
9
4
8
3
RXDATA
TXLED
RXLED
10
DB9M
VCC
Datasheet
Version 1.2
270R
FTDI# 261
VCC
270R
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