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13

UMFT230XA Datasheet

Version 1.4

Doc ument Reference N o.: FT _000519 C learance N o.: FT DI# 2 6 9

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 between VCCIO 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

MCU

Vcc = 3.3V

TXD

RXD

RTS#

CTS#

TXD

RXD

RTS#

CTS#

Solder Links JP2 - Open

Solder Links JP1 - Closed

GND

Vcc = 3.3V

VCCIO

3V3OUT

VBUS

VCC

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 powered at 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)