UM232H 查看數據表（PDF） - Future Technology
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UM232H Datasheet PDF : 25 Pages
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Document Reference No.: FT_000367
UM232H Single Channel USB Hi-Speed FT232H Development Module
Datasheet Version 1.2
Clearance No.: FTDI# 198
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 PWRSAV# is used to prevent current from flowing the USB line in the same way as
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.
5V or 3V3
MCU
RXD
TXD
CTS#
RTS#
J2-1
PU2
PU1
VIO
3V3
TXD
RXD
RTS#
CTS#
5V
J1-1
5V0
USB
ACBUS7
J2-14
J1-14
Figure 7.4 : Alternative Self-Powered Configuration – 5V0 External Supply
17
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