Copyright © 2013 Future Technology Devices International Limited

1

FT231X USB TO FULL HANDSHAKE UART IC

Datasheet

Version 1.2

Document No.: FT_000565 Clearance No.:

FTDI# 261

Future Technology

FT231X

The FT231X is a USB to serial UART

interface with full modem control and

the following advanced features:



Single chip USB to asynchronous serial data

transfer interface.



Entire USB protocol handled on the chip. No

USB specific firmware programming required.



Fully

integrated

2048

byte

multi-time-

programmable (MTP) memory, storing device

descriptors and CBUS I/O configuration.



Fully integrated clock generation with no

external crystal required plus optional clock

output selection enabling glue-less interface

to external MCU or FPGA.



Data transfer rates from 300 baud to 3 Mbaud

(RS422, RS485, and RS232 ) at TTL levels.



512 byte receive buffer and 512 byte transmit

buffer utilising buffer smoothing technology to

allow for high data throughput.



FTDI’s royalty-free Virtual Com Port (VCP)

and Direct (D2XX) drivers eliminate the

requirement for USB driver development in

most cases.



Configurable CBUS I/O pins.



Transmit and receive LED drive signals.



UART interface support for 7 or 8 data bits, 1

or 2 stop bits and odd / even / mark / space

no parity



Synchronous and asynchronous bit bang

interface options with RD# and WR# strobes.



USB Battery Charger Detection. Allows for USB

peripheral devices to detect the presence of a

higher

power

source

to

enable

improved

charging.



Device supplied pre-programmed with unique

USB serial number.



USB

Power

Configurations;

supports

bus-

powered, self-powered and bus-powered with

power switching



Integrated +3.3V level converter for USB I/O.



True 3.3V CMOS drive output and TTL input;

Operates down to 1V8 with external pull-ups.

Tolerant of 5V input.



Configurable I/O pin output drive strength; 4

mA(min) and 16 mA(max).



Integrated power-on-reset circuit.



Fully integrated AVCC supply filtering - no

external filtering required.



UART signal inversion option.



+ 5V Single Supply Operation.



Internal 3V3/1V8 LDO regulators

Low operating and USB suspend current; 8mA

(active-typ) and 125uA (suspend-typ).



UHCI/OHCI/EHCI host controller compatible



USB 2.0 Full Speed capable.



Extended operating temperature range; -40 to

85⁰C.



Available in compact, Pb-free, 20 Pin SSOP and

QFN packages (both RoHS compliant).

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced

in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are

supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology

Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your

statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in

which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary

information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by

the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow

G41 1HH United Kingdom. Scotland Registered Company Number: SC136640