UMFT221XE-01 FTDI, UMFT221XE-01 Datasheet - Page 8

• Manufacturer Part Number: UMFT221XE-01
• Description: Interface Development Tools USB to 8-Bit SPI FT1248 Mod.
• Manufacturer: FTDI
• Type: USB to SPIr
• Series: FT221Xr

Specifications of UMFT221XE-01

• Rohs: yes
• Product: Development Modules
• Tool Is For Evaluation Of: FT221XQ
• Interface Type: I2C, SPI, USB
• Operating Supply Voltage: 3.3 V
• Description/function: USB to 8bit SPI evaluation module
• Dimensions: 29.02 mm x 19.24 mm x 9.2 mm
• Operating Supply Current: 1 A
• Factory Pack Quantity: 25
• For Use With: FT221XQ

5.2
Figure 5.1 – Bus Powered Configuration
A bus powered configuration draws its power from the USB host/hub. The UMFT221XE is configured by
default to be in bus powered mode.
Figure 5.1 illustrates the UMFT221XE module in a typical USB bus powered design configuration. By
default 3V3OUT is connected to VCCIO, and VBUS is connected to VCC.
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 FT221X power input (VCC)
+3.3V power is sourced from the FT221X‟s voltage regulator output and is connected to the FT221X IO
port‟s power input (VCCIO).
Interfacing the UMFT221XE module to a microcontroller (MCU), or other logic devices for bus powered
configuration is done in exactly the same way as a self-powered configuration (see Section 5.3), 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).
Bus Powered Configuration
Current Flow
Jumper JP1 - Closed
3V3 TTL Mode
Self-Sourced
GND
connection
Alternative
3V3OUT
VCCIO
Copyright © 2012 Future Technology Devices International Limited
Document Reference No.: FT_000651
VBUS
VCC
connection
Jumper JP2 - Closed
Alternative
Bus Powered
Mode
GND
Clearance No.: FTDI#
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