Copyright © 2015 Future Technology Devices International Limited

1

FT234XD USB TO BASIC UART IC

Version 1.2

Document No.: FT_000753 Clearance No.: FTDI#324

Future Technology

Devices International

FT234XD

The FT234XD is a USB to serial UART

interface with optimised packaging (3mm

x 3mm 12 pin DFN) for smaller PCB

designs 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 a 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 pin.



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 Charging 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 3.3V/1.8V LDO regulators



Low operating and USB suspend current;

8mA (active-typ) and 70uA (suspend-typ).



UHCI/OHCI/EHCI host controller compatible.



USB 2.0 Full Speed compatible.



Extended operating temperature range; -40 to

85⁰C.



Available in compact Pb-free 12 pin DFN package

(3mm x 3mm) 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