Copyright © Future Technology Devices International Limited

9

UMFT230XA Datasheet

Version 1.4

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

5.3 Bus Power Configuration

GND

Solder Link JP1 - Closed

GND

Solder Link JP2 - Closed

Alternative

connection

Alternative

connection

Current Flow

Bus Powered

Mode

Self-Sourced

3V3 TTL Mode

VCCIO

3V3OUT

VBUS

VCC

Viewing pins thourgh the board

from the top.

Figure 5.1 – Bus Powered Configuration

A bus powered configuration draws its power from the USB host/hub. The UMFT230XA is configured by

default to be in bus powered mode.

Figure 5.1illustrates the UMFT230XA module in a typical USB bus powered design configuration. By

default solder bridge connections link VCCIO to 3V3OUT, and VCC to VBUS. (Note that Figure 5.1 is for

illustration only and that the pins do not actually go all the way through the PCB

For a bus power configuration power is supplied from the USB VBUS:

+5V VBUS power is sourced from the USB bus and is connected to the FT230X power input (VCC)

+3.3V power is sourced from the FT230X’s voltage regulator output and is connected to the FT230X IO

port’s power input (VCCIO).

Interfacing the UMFT230XA module to a microcontroller (MCU), or other logic devices for bus powered

configuration is done the same way as a self powered configuration (see Section 3), except that it is

possible for the MCU or external device to take its power supply from the USB bus (either the 5V from

the USB pin, or 3.3V from the 3V3OUT pin).