UMFT230XA Datasheet
Version 1.4
Document Reference No.: FT_000519 Clearance No.: FTDI#269
Note 2: If power is applied to VCCIO and no power is applied to VCC all Ios will be at an unknown state,
this however will not damage the chip. The FT230X also has protective circuitry to prevent the chip being
damaged by a voltage discrepancy betweenVCCIO and the level of the signal being processed.
Note 3: When using VCCIO less than 3V3 on a chip from FTDI’s X-chip range, it is recommended to uses
pull up resistors (47K) to VCCIO on the data lines, all of the UMFT2xxXA devices include an on-board
pull-up for these lines.
5.7 3.3V Voltage Supply
Vcc = 3.3V
Vcc = 3.3V
TXD
TXD
RXD
RTS#
CTS#
RXD
RTS#
CTS#
MCU
VCCIO
VCC
3V3OUT
VBUS
GND
Solder Links JP2 - Open
Solder Links JP1 - Closed
Viewing pins thourgh the board
from the top.
Figure 5.5 – USB Self Powered 3.3V Logic Drive
The FT230X can be powered from a single 3.3V supply. This feature is an alternative to having the
FT230X poweredat 5V in standard self-powered configuration.
The 3.3V Self Powered configuration is illustrated in Figure 5.5. Note that the 3.3V input is connected to
VCC, VCCIO and 3V3OUT. (Note that Figure 5.5 is for illustration only and that the pins do not actually go
all the way through the PCB)
Copyright © Future Technology Devices International Limited
13
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
