ft232hq Future Technology Devices International Ltd., ft232hq Datasheet - Page 54

• Manufacturer Part Number: ft232hq
• Description: Ft232h Single Channel Hi- Speed Usb To Multipurpose Uart/fifo Ic
• Manufacturer: Future Technology Devices International Ltd.

Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.0
Clearance No.: FTDI #199
6.2 USB Self Powered Configuration
Self Powered application example 1: Self powered configuration running on 5V.
Figure 6.2 Self Powered Configuration Example 1
Figure 6.2 illustrates the FT232H in a typical USB self powered configuration. A USB self powered device
gets its power from its own external power supply which is connected to VREGIN. In this application the
VREGIN is the +5V input to the on chip +3.3V/1.8V regulator. The output of the on chip LDO regulator
(+1.8V) drives pin 38, the FT232H core supply (VCORE) and pin 37, the VCCA. The output of the on chip
LDO regulator (3.3V) supplies 3.3V to the VCCIOs, VPLL and VPHY through VCCD. Please note that when
the FT232H running on +5V (VREGIN), the VCCD becomes an output.
Note that in this set-up, the EEPROM should be configured for self-powered operation and the option
“suspend on ACBUS7 low” selected in FT_Prog. Also this configuration uses the pin ACBUS7, so this
assumes that MPSSE mode is not selected.
Copyright © 2011 Future Technology Devices International Limited
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