7

Copyright © 2012 Future Technology Devices International Limited

UMFT221XE

Version 1.0

Document Reference No.: FT_000651

Clearance No.: FTDI#

293

5

Module Configurations

5.1

Jumper Configuration Options

Jumper No.

Setting

Status

Description

JP1

Shorted

Default

Connects internal 3.3V regulator to VCCIO. This restricts signal drive to only 3.3V

level signals.

JP1

Opened

Non-

Default

Disconnects internal 3.3V regulator connection to VCCIO. This mode allows for the

supply of 1.8V-3.3V power from an external power supply, thus allows the

processing of signals with logic levels between 1.8V and 3.3V. VCCIO can be

adjusted to match the interface requirements of external circuitry.

Table 5.1 – Jumper JP1 Pin Description

Jumper No.

Setting

Status

Description

JP2

Shorted

Default

Connects VBUS to VCC. This mode is known as “USB-Powered” mode.

JP2

Opened

Non-

Default

Disconnects VBUS to VCC. This allows the supply of power from an external power

supply. This mode is known as “Self-Powered” mode.

Table 5.2 – Jumper JP2 Pin Description

Note: There should never be more than one power output supplied to the same net. If JP2 is fitted when

an external power supply is applied a direct short between two power supplies will be formed, this can

result in damage to the UMFT221XE module and the target circuit.