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UMFT231XE-01 Datasheet(PDF) 8 Page - Future Technology Devices International Ltd. |
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UMFT231XE-01 Datasheet(HTML) 8 Page - Future Technology Devices International Ltd. |
8 / 18 page 8 Copyright © 2012 Future Technology Devices International Limited UMFT231XE Version 1.0 Document Reference No.: FT_000652 Clearance No.: FTDI# 294 5.2 Bus Powered Configuration GND Jumper JP1 - Closed GND Jumper JP2- Closed Alternative connection Alternative connection Current Flow Bus Powered Mode Self-Sourced 3V3 TTL Mode VCCIO 3V3OUT VBUS VCC Figure 5.1 – Bus Powered Configuration A bus powered configuration draws its power from the USB host/hub. The UMFT231XE is configured by default to be in bus powered mode. Figure 5.1 illustrates the UMFT231XE module in a typical USB bus powered design configuration. By default VCCIO is connected to 3V3OUT, and VCC is connected to VBUS. 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 FT231X power input (VCC) +3.3V power is sourced from the FT231X‟s voltage regulator output and is connected to the FT231X IO port‟s power input (VCCIO). Interfacing the UMFT231XE 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 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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