UMFT234XF Datasheet
Version 1.0
Document Reference No.: FT_000818
Clearance No.: FTDI#
337
Future Technology
Devices
International Ltd
Datasheet
UMFT234XF Development
Module
UMFT234XF is a USB to UART development module
1
Introduction
The UMFT234XF development module utilizes FTDI’s FT234XD IC to convert USB to a basic UART (RXD,
TXD, RTS#, CTS#).
1.1
Features
The UMFT234XF is a development module that converts USB2.0 Full-Speed to UART. The module includes a
micro-B USB connector to connect to a USB host and the UART IO are available on separate pads. The
module is designed to be soldered directly to another PCB (PCB on PCB technology).
The UART interface operates between +1.8V and +3.3V voltage levels depending on the VIO signal, however
all I/Os are 5V tolerant.
An additional configurable bus (CBUS) pad allows for general IO or indicating that the module is connected to
a dedicated charging port for battery charging.
1.2
Ordering Information
Module
UMFT234XF
Interface
UART
Features
USB 2.0 full speed to basic UART with one control bus line which may be
used for battery charger detection.
The PCB pads are designed to be soldered directly to another PCB for
secure bonding.
Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees
to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting
from such use.
UMFT234XF Datasheet
Version 1.0
Document Reference No.: FT_000818
Clearance No.: FTDI#
337
2
Driver Support
Royalty-Free D2XX Direct Drivers:
Windows 8 32,64-bit
Windows 7 32,64-bit
Windows Vista
Windows XP 32,64-bit
Windows XP Embedded
Windows CE.NET 4.2, 5.0 and 6.0
MAC OS OS-X
Linux 3.0 and greater
Android
Windows 8 32,64-bit
Windows 7 32,64-bit
Windows Vista
Windows XP 32,64-bit
Windows XP Embedded
Windows CE.NET 4.2 , 5.0 and 6.0
MAC OS OS-X
Linux 3.0 and greater
Android
Royalty-Free VIRTUAL COM PORT (VCP):
The drivers listed above as well as Third Party Drivers for other operating systems are available for free
downloads from
www.ftdichip.com.
2
Copyright ©
2013
Future Technology Devices International Limited
UMFT234XF Datasheet
Version 1.0
Document Reference No.: FT_000818
Clearance No.: FTDI#
337
Table of Contents
1
Introduction ................................................................................... 1
1.1
1.2
Features ........................................................................................................ 1
Ordering Information .................................................................................... 1
2
3
Driver Support ................................................................................ 2
UMFT234XF Signals and Configurations.......................................... 4
3.1
3.2
3.3
UMFT234XF CN1 Signal Descriptions ............................................................. 4
UMFT234XF PAD Signal Descriptions ............................................................. 4
UMFT234XF J-1 ............................................................................................. 4
4
5
6
7
8
9
CBUS Signal Options ....................................................................... 5
4.1
Configuring the MTP ROM .............................................................................. 6
Module Dimensions ........................................................................ 7
Module Circuit Schematic ............................................................... 8
6.1
UMFT234XF Schematic .................................................................................. 8
Environmental Compliances ........................................................... 9
Internal MTP ROM Configuration .................................................. 10
Contact Information ..................................................................... 11
Appendix A - List of Figures and Tables ................................................................... 9
Appendix B: Revision History ................................................................................ 10
3
Copyright ©
2013
Future Technology Devices International Limited
UMFT234XF Datasheet
Version 1.0
Document Reference No.: FT_000818
Clearance No.: FTDI#
337
3
UMFT234XF Signals and Configurations
USB connectivity is via CN1 a micro-B USB connector. The UART and CBUS signals are available on PCB
pads.
3.1
UMFT234XF CN1 Signal Descriptions
Pin No.
Name
Type
Description
5V Power input to USB port, for a USB bus low-powered design; up to 100mA may be
sourced from the 5V supply on the USB bus. A maximum of 500mA can be sourced
from the USB bus in a USB bus high-powered design.
Negative USB data signal
Positive USB data signal
Not Connected
1
2
3
4
VBUS
D-
D+
ID
PWR
Signal
Signal
Signal
5
GND
PWR
Module Ground
Table 1 USB Connector Pin Out Description
3.2
UMFT234XF PAD Signal Descriptions
Pad
No.
P1
P2
Name
RESET#
3V3
Type
Signal
PWR
Description
Active low input may be used to reset the FT234XD IC
3V3OUT from FT234XD. May be used for external logic. (50mA max)
Also powers the FT234XD VCCIO (if JP1 fitted (default)
Optional input to supply the FT234XD VCCIO from an external supply. VIO may be
between 1.8V to 3.3V.
JP1 must be disconnected to use this input.
P4
P5
P6
P7
P8
P9
GND
VBUS
CB0
TXD
RTS#
RXD
PWR
PWR
Signal
Signal
Signal
Signal
Module GND
5V output supplied from the USB port.
Configurable Bus pin 0. Available settings for the pin are defined in table 3. The
default is PWREN#
UART data output signal
UART Ready to Send output signal. Active low.
UART data input signal
P3
VIO
PWR
P10
CTS#
Signal
UART Clear to Send input signal. Active low.
Table 2 USB Connector Pin Out Description
3.3
UMFT234XF J-1
J-1 is used to connect/disconnect the 3V3OUT frm the FT234XD IC to the VCCIO input pin. By default it is
connected.
4
Copyright ©
2013
Future Technology Devices International Limited
UMFT234XF Datasheet
Version 1.0
Document Reference No.: FT_000818
Clearance No.: FTDI#
337
4
CBUS Signal Options
Available On
CBUS Pin
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
IO Pad is tri-stated
Output a constant 1
Output a constant 0
Enable transmit data for RS485
Output is low after the device is configured by USB but high during USB
suspended mode. This output is used to control power to external logic.
Transmit data LED drive – open drain pulses low when transmitting data via
UART.
Receive data LED drive – open drain pulses low when receiving data via
UART.
LED drive – open drain pulses low when transmitting or receiving data via
UART.
Goes low during USB suspend mode. Typically used to power down external
logic to RS232 level converter IC in USB to RS232 converter designs
24 MHz Clock output.**
12 MHz Clock output.**
6 MHz Clock output.**
CBUS bit bang mode option. Allows up to 4 of the CBUS pins to be used as
general purpose I/O. A separate application note,
AN232R-01,
available
from
FTDI website
(www.ftdichip.com) describes in more detail how to use
CBUS bit bang mode.
Battery Charge Detect indicates when the device is connected to a dedicated
battery charger host. Active high output. NOTE: Requires a 10K pull-down
to remove power up toggling.
Active low BCD Charger, driven by an open drain to ground with no internal
pull-up.
Synchronous and asynchronous bit bang mode WR# strobe output.
Synchronous and asynchronous bit bang mode RD# strobe output.
Input to detect when VBUS is present.
Toggle signal which changes state each time a USB SOF is received
Active Low input, prevents the chip from going into suspend.
CBUS Signal
Option
Tristate
DRIVE_1
DRIVE_0
TXDEN
PWREN#
Description
TXLED#
RXLED#
TX&RXLED#
SLEEP#
CLK24MHz
CLK12MHz
CLK6MHz
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
GPIO
CBUS0
BCD_Charger
CBUS0
BCD_Charger#
BitBang_WR#
BitBang_RD#
VBUS_Sense
Time_Stamp
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
Keep_Awake#
CBUS0
Table 3 CBUS Configuration Control
* PWREN# must be used with a 10kΩ resistor pull up.
**When in USB suspend mode the outputs clocks are also suspended.
5
Copyright ©
2013
Future Technology Devices International Limited
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