Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.09
Clearance No.: FTDI#77
6 FT2232H Configurations
The following sections illustrate possible USB power configurations for the FT2232H.
All USB power configurations illustrated apply to both package options for the FT2232H device
6.1 USB Bus Powered Configuration
Bus Powered Application example 1: Bus 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
LDO +3.3V
Vin Vout
GND
+3.3V
50
16
17
18
19
21
22
23
24
VREGIN
ADBUS0
ADBUS1
ADBUS2
ADBUS3
49
+1.8V
VREGOUT
3.3uF
ADBUS4
ADBUS5
ADBUS6
ADBUS7
100nF
GND
100nF
GND
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#
0Ω
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
+3.3V
2
OSCI
1
8
BCBUS6
BCBUS7
CS
ORG
D
VCC
Q
6
3
2
4
7
1
3
3
OSCO
TEST
93C46
60
36
PWREN#
SUSPEND#
2.2K
SCL
12MHz
13
DU
5
GND
27pF
GND
27pF
GND
GND
GND
Figure 6.1 Bus Powered Configuration Example 1
Figure 6.1 illustrates the FT2232H in a typical USB bus powered design configuration. A USB bus powered
device gets its power from the USB bus. In this application, the FT2232H requires that the VBUS (USB
+5V) is regulated down to +3.3V (using an LDO) to supply the VCCIO, VPLL, VPHY and VREGIN.
VREGIN is the +3.3V input to the on chip +1.8V regulator. The output of the on chip LDO regulator
(+1.8V) drives the FT2232H core supply (VCORE). This requires a minimum of a 3.3uF filter capacitor.
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48
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