FT232H datasheet(51/65 Pages) FTDI

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Document No.: FT_000288

FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC

Datasheet Version 1.81

Clearance No.: FTDI #199

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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