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© Copyright 2011 Future Technology Devices International Ltd

Document Reference No.: FT_000367

UM232H Single Channel USB Hi-Speed FT232H Development Module

Datasheet Version 1.2

Clearance No.: FTDI# 198

USB

5V0

3V3

VIO

J2-1

J2-14

J1-1

J1-14

3V3

MCU

TXD

TXD

RXD

RXD

RTS#

CTS#

RTS#

CTS#

5V or 3V3

3V3

PU1

RST#

PU2

Figure 7.5 : Self-Powered Configuration – 3V3 External Supply

Figure 7.4 illustrates the UM232H in a typical USB Self-Powered configuration similar to Figure 7.3. The

difference here is that the UM232H module is powered from an external 3.3V supply which is connected to

the 5V0 (+3V3 power supply input can also be supplied to 5V0 pin), VIO and 3V3 pins of the modules.

Please note that when the UM232H running from +3V3, the 3V3 pin becomes an input. The VIO and 3V3

pins connection provides 3V3 to the VCCIOs, VPLL and VPHY on the FT232H chip.

Simularly to the USB-Powered configuation an alternative configuration which utilised PWRSAV# can be

implemented. Figure 7.6 illustrated this configuration.

USB

5V0

3V3

VIO

J2-1

J2-14

J1-1

J1-14

3V3

MCU

TXD

TXD

RXD

RXD

RTS#

CTS#

RTS#

CTS#

5V or 3V3

3V3

PU1

ACBUS7

PU2

Figure 7.6 : Alternative Self-Powered Configuration – 3V3 External Supply