`
Document Reference No.: FT_000331
FT4232H Hub Module Datasheet
Version 1.0
Clearance No.: FTDI# 174
Power Supply of FT4232H Hub Module
The GL850G and the FT4232H ICs and their related circuits on the FT4232H Hub Module are directly
powered by USB bus power. The estimated current consumed by the cirucuits of module is about 100-
300mA depending on the application. It is important that the user ensures that the host can supply this
current via USB.
The maximum total current consumed by the external usb devices on downstream port 2 and 3 is 1A. If
the total current exceed 1A, the fuse on the FT4232H Hub Module will be disconnected. If this occurs
then LEDs D2 and D5 on the module will illuminate to indicate over-current status.
There are two options to supply power to external downstream usb devices connected to ports 2 and 3.
1. Use USB bus power to supply downstream ports:
Connect 5V to VCC_BUS (CN3, pin 3 to CN3, pin 2).
This connection uses the power from
upstream USB bus to supply the downstream USB ports of the USB hub. With this connection, user
should make sure that the usb host can supply enough current to the external USB devices – in
addition to the current required by the module.
2. Use external power to supply downstream ports:
Connect 5V (CN3, pin 3) to external +5v DC power supply.
This connection takes the power
from external power to supply the downstream USB ports of USB hub. Users should also make sure
that the external power can supply enough current required by the external devices.
Note: It is recommened to select the mode of operation before connecting the FT4232H Hub
Module.
Copyright © 2010 Future Technology Devices International Limited
8
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
