UMFT234XD-NC FTDI, UMFT234XD-NC Datasheet - Page 4

• Manufacturer Part Number: UMFT234XD-NC
• Description: Interface Development Tools USB to UART w/4 Cntl Bus, 8 Pads on PCB
• Manufacturer: FTDI
• Type: USB to UARTr

Specifications of UMFT234XD-NC

• Rohs: yes
• Product: Development Modules
• Tool Is For Evaluation Of: FT234XD
• Interface Type: UART, USB
• Operating Supply Voltage: 3.3 V
• Dimensions: 36.3 mm x 12.1 mm x 2 mm
• Operating Supply Current: 50 mA
• For Use With: FT234XD

CBUS Signal
BCD_Charger#
Keep_Awake#
BitBang_WR#
BCD_Charger
BitBang_RD#
VBUS_Sense
Time_Stamp
TX&RXLED#
3.3
Table 3.3 CBUS Configuration Control
* PWREN# must be used with a 10kΩ resistor pull up.
**When in USB suspend mode the outputs clocks are also suspended.
CLK24MHz
CLK12MHz
CLK6MHz
DRIVE_1
DRIVE_0
PWREN#
Option
RXLED#
TXLED#
Tristate
SLEEP#
TXDEN
GPIO
CBUS Signal Options
Available On
CBUS Pin
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
CBUS0
Copyright ©
2013
IO Pad is tri-stated
Output a constant 1
Output a constant 0
Enable transmit data for RS485
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.
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
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.
Future Technology Devices International Limited
(www.ftdichip.com) describes in more detail how to use CBUS bit
Document Reference No.: FT_000801
Description
UMFT234XD Datasheet
Clearance No.: FTDI#
Version 1.0
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