FT4232HQ-TRAY Datasheet, PDF(31/45 Page) Future Technology Devices International Ltd. – Quad High Speed USB to Multipurpose UART/MPSSE IC

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FT4232HQ-TRAY Datasheet, PDF (31/45 Pages) Future Technology Devices International Ltd. – Quad High Speed USB to Multipurpose UART/MPSSE IC

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Document No.: FT_000060

FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC

Datasheet Version 2.2

Clearance No.: FTDI#78

6.2 USB Self Powered Configuration

Self Powered application example 1: Self powered configuration

+3.3V

4.7uF 4.7uF 100nF 100nF

GND GND GND GND

+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V

100nF 100nF 100nF 100nF 100nF 100nF 100nF

GND GND GND GND GND GND GND

+1.8V

+3.3V

Ext. Power Supply

GND

100nF

GND

LDO +3.3V

Vin Vout

GND

+3.3V

+1.8V

50 VREGIN

49 VREGOUT

GND

100nF

GND

3.3uF

GND

VBUS 1

D-

D+

GND

4.7K

10K

12K

6 REF

14 RESET#

+3.3V

10K 10K

GND

10K

+3.3V

VCC 8

ORG

SCL

93C46 Q

GND

2.2K

GND

EECLK

EEDATA

EECS

EECLK

EEDATA

2 OSCI

12MHz

3 OSCO

13 TEST

27pF

GND

27pF

GND

ADBUS0

ADBUS1

ADBUS2

ADBUS3 19

ADBUS4 21

ADBUS5 22

ADBUS6 23

ADBUS7 24

BDBUS0 26

BDBUS1 27

BDBUS2 28

BDBUS3 29

BDBUS4 30

BDBUS5 32

BDBUS6 33

BDBUS7 34

CDBUS0

CDBUS1

CDBUS2 40

CDBUS3 41

CDBUS4 43

CDBUS5 44

CDBUS6 45

CDBUS7 46

DDBUS0

DDBUS1

DDBUS2

DDBUS3 54

DDBUS4 55

DDBUS5 57

DDBUS6 58

DDBUS7 59

PWREN# 60

SUSPEND# 36

GND

Figure 6.3 Self Powered Configuration Example 1

Figure 6.3 illustrates the FT4232H in a typical USB self powered configuration. A USB self powered device

gets its power from its own power supply and does not draw current from the USB bus. In this example

an external power supply is used. This external supply is regulated to +3.3V.

Note that in this set-up, the EEPROM should be configured for self-powered operation.

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