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FT232H Datasheet(PDF) 52 Page - Future Technology Devices International Ltd. |
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FT232H Datasheet(HTML) 52 Page - Future Technology Devices International Ltd. |
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52 / 65 page  Copyright © 2014 Future Technology Devices International Limited 52 Document No.: FT_000288 FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC Datasheet Version 1.81 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, VCORE and pin 37, 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” is enabled in FT_Prog. This configuration uses the ACBUS7 pin, when this function is enabled ACBUS7 should not be used as a GPIO in MPSSE mode. |
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