Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.09
Clearance No.: FTDI#78
6 FT4232H Configurations
The following sections illustrate possible USB power configurations for the FT4232H.
All USB power configurations illustrated apply to both package options for the FT4232H 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
GND
ADBUS4
ADBUS5
ADBUS6
ADBUS7
100nF
GND
100nF
GND
GND
1
2
3
4
26
27
28
29
30
32
33
34
VBUS
D-
D+
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
7
DM
8
DP
GND
6
REF
+3.3V
14
RESET#
BDBUS6
BDBUS7
1K
0?
GND
12K
38
39
40
41
43
44
45
46
CDBUS0
CDBUS1
CDBUS2
CDBUS3
CDBUS4
CDBUS5
+3.3V
GND
10K
10K
10K
CDBUS6
CDBUS7
63
62
61
EECS
EECLK
EEDATA
EECLK
EEDATA
48
52
53
54
55
57
58
59
DDBUS0
DDBUS1
DDBUS2
DDBUS3
DDBUS4
DDBUS5
+3.3V
2
OSCI
1
6
3
2
8
CS
ORG
D
SCL
GND
VCC
Q
DDBUS6
DDBUS7
4
7
1
3
3
OSCO
TEST
93C46
60
36
PWREN#
SUSPEND#
2.2K
12MHz
13
DU
5
27pF
GND
27pF
GND
GND
GND
Figure 6.1 Bus Powered Configuration Example 1
Figure 6.1 illustrates the FT4232H in a typical USB bus powered design configuration. A USB bus powered
device gets its power from the USB bus. In this application, the FT4232H 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 FT4232H core supply (VCORE). This requires a minimum of a 3.3uF filter capacitor.
Copyright © 2010 Future Technology Devices International Limited
29
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