Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.09
Clearance No.: FTDI#77
6.2 USB Self Powered Configuration
Self Powered application example 1: Self powered configuration
+3.3V
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
+3.3V
100nF 100nF 100nF 100nF
100nF 100nF 100nF
GND GND GND GND GND GND GND
4.7uF 4.7uF 100nF 100nF
GND GND GND GND
+1.8V
+3.3V
Ext. Power Supply
LDO +3.3V
Vin Vout
GND
+3.3V
50
49
16
17
18
19
21
22
23
24
VREGIN
1
2
ADBUS0
ADBUS1
ADBUS2
ADBUS3
+1.8V
VREGOUT
GND
ADBUS4
ADBUS5
ADBUS6
ADBUS7
100nF
GND
VBUS
100nF
GND
3.3uF
GND
GND
1
2
3
4
26
27
28
29
30
32
33
34
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
VBUS
D-
D+
7
8
DM
DP
GND
6
REF
+3.3V
14
ACBUS6
ACBUS7
RESET#
0?
1K
GND
12K
38
39
40
41
43
44
45
46
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
+3.3V
GND
10K
10K
10K
BDBUS6
BDBUS7
63
62
61
EECS
EECLK
EEDATA
EECLK
EEDATA
48
52
53
54
55
57
58
59
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
VBUS
4.7K
+3.3V
2
OSCI
1
6
3
2
8
BCBUS6
BCBUS7
CS
ORG
D
VCC
Q
4
7
1
3
3
OSCO
TEST
93C46
60
36
PWREN#
SUSPEND#
2.2K
SCL
10K
12MHz
13
DU
5
GND
27pF
GND
27pF
GND
GND
GND
GND
Figure 6.3 Self Powered Configuration Example 1
Figure 6.3 illustrates the FT2232H 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 and the option
“suspend on DBUS7 low” selected in MPROG. Also this configuration uses the pin BCBUS7, so this
assumes that MPSSE mode is not selected.
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50
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