FT232HQ-TRAY Datasheet, PDF (52/66 Pages) Future Technology Devices International Ltd. – Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC

Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.82
Clearance No.: FTDI #199
6 FT232H Configurations
The following section illustrates possible USB power configurations for the FT232H.
All USB power configurations illustrated apply to both package options for the FT232H device
6.1 USB Bus Powered Configuration
Bus Powered Application example 1: Bus powered configuration running on +5V
Figure 6.1 Bus Powered Configuration Example 1
Figure 6.1 illustrates the FT232H in a typical USB bus powered design configuration. A USB bus powered
device gets its power from the VBUS (+5V) 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 pin
39, VCCD. Please note that when the FT232H running on +5V (VREGIN), the VCCD becomes an output.
Note:
1. In this application, pin 40 (VREGIN) is the +5V input to the on chip +3.3V/1.8V regulator.
Since the VREGIN is +5.0V, pin 39 (VCCD) becomes 3V3 output and supplies 3.3V to the
VCCIOs, VPLL and VPHY.
2. The output of the on chip LDO +3.3V/1.8V regulator (+1.8V) drives pin 38, the FT232H core
supply (VCORE) and pin 37, the VCCA.
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