UM232H FTDI, Future Technology Devices International Ltd, UM232H Datasheet - Page 18

• Manufacturer Part Number: UM232H
• Description: MOD EVAL USB - SERIAL - FT232H
• Manufacturer: FTDI, Future Technology Devices International Ltd

Specifications of UM232H

• Main Purpose: Interface, USB 2.0 to Serial FIFO Bridge
• Embedded: No
• Utilized Ic / Part: FT232H
• Primary Attributes: High Speed (480Mbps) Transceiver
• Secondary Attributes: LED Status Indicators
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1103

An alternative to connecting the pull-up network to the Reset pin, to prevent current from flowing back the
USB power bus line, is to connect the network ACBUS7 pin to achieve the same results but with additional
benefits. A function called
connecting the reset to the a pull-up network. However, the PWRSAV# function has the additional feature
of being able to put FT232H into sleep mode when the USB host is powered down. There is one trade of o
using reset instead of PWRSAV#, in MPSSE mode the ACBUS7 pin can be selected as a GPIO pin, using this
pin from both PWRSAV# and GPIO mode can cause a conflict. PWRSAV# is enabled and disabled using the
EEPROM, this function is disabled by default. Figure 7.4 illustrates an alternative USB Self-Power
configuration.
Figure 7.4 : Alternative Self-Powered Configuration – 5V0 External Supply
5V or 3V3
MCU
© Copyright 2011 Future Technology Devices International Ltd
PWRSAV#
CTS#
RXD
RTS#
TXD
is used to prevent current from flowing the USB line in the same way as
UM232H Single Channel USB Hi-Speed FT232H Development Module
17
J2-14
TXD
RXD
RTS#
CTS#
J2-1
PU2
PU1
3V3
VIO
Document Reference No.: FT_000367
USB
5V0
J1-1
ACBUS7
J1-14
Clearance No.: FTDI# 198
5V
Datasheet Version 1.2