UMFT230XA-02 Datasheet, PDF (9/21 Pages) Future Technology Devices International Ltd. – UMFT230XA USB to Basic UART Development Module

5.3 Bus Power Configuration
UMFT230XA Datasheet
Version 1.4
D oc ument Reference N o.: FT _000519 C learance N o.: FT DI# 2 6 9
GND
Alternative
connection
Current Flow
GND
VCCIO
3V3OUT
VCC
VBUS
Alternative
connection
Self-Sourced
Bus Powered
3V3 TTL Mode
Mode
Solder Link JP1 - Closed
Solder Link JP2 - Closed
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 pow er 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).
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