UMFT234XF FTDI, UMFT234XF Datasheet - Page 5

• Manufacturer Part Number: UMFT234XF
• Description: Interface Development Tools USB to UART Breakout Board
• Manufacturer: FTDI
• Type: USB to UARTr

Specifications of UMFT234XF

• Rohs: yes
• Product: Development Modules
• Tool Is For Evaluation Of: FT234XD
• Interface Type: UART, USB
• Operating Supply Voltage: 1.8 V to 3.3 V
• Description/function: Development module utilizes FTDI?s FT234XD IC to convert USB to a basic UART
• Operating Supply Current: 100 mA
• For Use With: FT234XD

4
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.
CBUS Signal
BCD_Charger#
Keep_Awake#
BitBang_WR#
BitBang_RD#
BCD_Charger
VBUS_Sense
Time_Stamp
TX&RXLED#
CLK24MHz
CLK12MHz
CLK6MHz
DRIVE_1
DRIVE_0
PWREN#
Option
TXLED#
RXLED#
SLEEP#
Tristate
TXDEN
GPIO
CBUS Signal Options
Available On
CBUS Pin
Copyright © 2013 Future Technology Devices International Limited
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
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
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.
FTDI website
Document Reference No.: FT_000818
(www.ftdichip.com) describes in more detail how to use
Description
UMFT234XF Datasheet
Clearance No.: FTDI#
Version 1.0
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