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PDF FT231X Data sheet ( Hoja de datos )
| Número de pieza | FT231X | |
| Descripción | USB TO FULL HANDSHAKE UART IC | |
| Fabricantes | FTDI | |
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FT231X USB TO FULL HANDSHAKE UART IC
Datasheet
Version 1.2
Document No.: FT_000565 Clearance No.: FTDI# 261
Future Technology
Devices International Ltd.
FT231X
(USB to FULL HANDSHAKE UART IC)
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
to external MCU or FPGA.
glue-less interface
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 preliminar y
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
Copyright © 2013 Future Technology Devices International Limited
1
Free Datasheet http://www.datasheet4u.com/
1 page  
Table of Contents
FT231X USB TO FULL HANDSHAKE UART IC
Datasheet
Version 1.2
Document No.: FT_000565 Clearance No.: FTDI# 261
1 Typical Applications...................................................................... 2
1.1 Driver Support .................................................................................... 2
1.2 Part Numbers...................................................................................... 2
1.3 USB Compliant .................................................................................... 3
2 FT231X Block Diagram ................................................................. 4
3 Device Pin Out and Signal Description .......................................... 7
3.1 20-LD QFN Package ........................................................................... 7
3.1.1 QFN Package PinOut Description .................................................................................... 7
3.2 20-LD SSOP Package.......................................................................... 9
3.2.1 SSOP Package PinOut Description .................................................................................. 9
3.3 CBUS Signal Options ......................................................................... 10
4 Function Description................................................................... 13
4.1 Key Features..................................................................................... 13
4.2 Functional Block Descriptions ........................................................... 13
5 Devices Characteristics and Ratings ........................................... 16
5.1 Absolute Maximum Ratings............................................................... 16
5.2 ESD and Latch-up Specifications ....................................................... 16
5.3 DC Characteristics............................................................................. 17
5.4 MTP Memory Reliability Characteristics ............................................ 21
5.5 Internal Clock Characteristics........................................................... 21
6 USB Power Configurations.......................................................... 22
6.1 USB Bus Powered Configuration ...................................................... 22
6.2 Self Powered Configuration .............................................................. 23
6.3 USB Bus Powered with Power Switching Configuration .................... 24
7 Application Examples ................................................................. 25
7.1 USB to RS232 Converter ................................................................... 25
7.2 USB to RS485 Coverter ..................................................................... 26
7.3 USB to RS422 Converter ................................................................... 27
7.4 USB Battery Charging Detection ....................................................... 28
7.5 LED Interface.................................................................................... 30
8 Internal MTP Memory Configuration ........................................... 32
8.1 Default Values .................................................................................. 32
8.2 Methods of Programming the MTP Memory....................................... 34
8.2.1 Programming the MTP memory over USB...................................................................... 34
8.3 Memory Map ..................................................................................... 34
Copyright © 2013 Future Technology Devices International Limited
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
FT231X USB TO FULL HANDSHAKE UART IC
Datasheet
Version 1.2
Document No.: FT_000565 Clearance No.: FTDI# 261
The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both
package versions of the FT231X. These options can be configured in the internal MTP memory using the
software utility FT_PPROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The
default configuration is described in Section 8.
CBUS
Signal
Option
Available On CBUS Pin
Description
TRI-STATE
CBUS0, CBUS1, CBUS2, CBUS3
IO Pad is tri-stated
DRIVE 1
CBUS0, CBUS1, CBUS2, CBUS3
Output a constant 1
DRIVE 0
CBUS0, CBUS1, CBUS2, CBUS3
Output a constant 0
TXDEN
CBUS0, CBUS1, CBUS2, CBUS3
Enable transmit data for RS485
PWREN#
CBUS0, CBUS1, CBUS2, CBUS3
Output is low after the device has been configured by
USB, then high during USB suspend mode. This output can
be used to control power to external logic P-Channel logic
level MOSFET switch. Enable the interface pull-down
option when using the PWREN# in this way.
TXLED#
CBUS0, CBUS1, CBUS2, CBUS3
Transmit data LED drive – pulses low when transmitting
data via USB. See Section 7.5 for more details.
RXLED#
CBUS0, CBUS1, CBUS2, CBUS3
Receive data LED drive – pulses low when receiving data
via USB. See Section 7.5 for more details.
TX&RXLED#
CBUS0, CBUS1, CBUS2, CBUS3
LED drive – pulses low when transmitting or receiving data
via USB. See Section 7.5 for more details.
SLEEP#
CBUS0, CBUS1, CBUS2, CBUS3
Goes low during USB suspend mode. Typically used to
power down an external TTL to RS232 level converter IC
in USB to RS232 converter designs.
CLK24MHz
CBUS0, CBUS1, CBUS2, CBUS3
24 MHz Clock output.*
CLK12MHz
CBUS0, CBUS1, CBUS2, CBUS3
12 MHz Clock output.*
CLK6MHz
CBUS0, CBUS1, CBUS2, CBUS3
6 MHz Clock output.*
GPIO
CBUS0, CBUS1, CBUS2, CBUS3
CBUS bit bang mode option. Allows up to 4 of the CBUS
pins to be used as general purpose I/O. Configured
individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the
internal MTP memory. A separate application note,
AN232R-01, available from FTDI website
(www.ftdichip.com) describes in more detail how to use
CBUS bit bang mode.
BCD Charger
CBUS0, CBUS1, CBUS2, CBUS3
Battery Charge Detect, indicates when the device is
connected to a dedicated battery charger. Active high
output.
BCD
Charger#
CBUS0, CBUS1, CBUS2, CBUS3
Inverse of BCD Charger
BitBang_WR#
CBUS0, CBUS1, CBUS2, CBUS3
Synchronous and asynchronous bit bang mode WR#
strobe output.
BitBang_RD#
CBUS0, CBUS1, CBUS2, CBUS3
Synchronous and asynchronous bit bang mode RD# strobe
output.
VBUS Sense
CBUS0, CBUS1, CBUS2, CBUS3
Input to detect when VBUS is present.
Copyright © 2013 Future Technology Devices International Limited
11
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