Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.09
Clearance No.: FTDI#78
Self Powered application example 2: Self powered configuration (with additional 1.8V LDO voltage
regulator for VCORE)
+3.3V
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
+3.3V
100nF 100nF 100nF 100nF
LDO +1.8V
Vin Vout
GND
+1.8V
100nF 100nF 100nF
GND GND GND GND GND GND GND
4.7uF 4.7uF 100nF 100nF
GND GND GND GND
100nF
GND
100nF
GND
+1.8V
+3.3V
Ext. Power Supply
GND
LDO +3.3V
+3.3V
50
16
17
18
19
21
22
23
24
VREGIN
1
2
ADBUS0
Vin
Vout
ADBUS1
ADBUS2
ADBUS3
49
GND
VREGOUT
GND
ADBUS4
ADBUS5
ADBUS6
ADBUS7
100nF
GND
VBUS
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
4.7K
10K
14
BDBUS6
BDBUS7
RESET#
0?
1K
GND
12K
38
39
40
41
43
44
45
46
CDBUS0
CDBUS1
CDBUS2
CDBUS3
CDBUS4
CDBUS5
+3.3V
10K
GND
GND
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
4
7
DDBUS6
DDBUS7
CS
ORG
D
SCL
VCC
Q
1
3
3
OSCO
TEST
93C46
60
36
PWREN#
SUSPEND#
2.2K
12MHz
13
DU
5
GND
27pF
GND
27pF
GND
GND
GND
Figure 6.4 Self Powered Configuration Example 2
Figure 6.4 illustrates the FT4232H in a typical USB self powered configuration similar to Figure 6.3. The
difference here is that the +1.8V for the FT4232H core has been regulated from the external power
supply.
Note that in this set-up, the EEPROM should be configured for self-powered operation.
Copyright © 2010 Future Technology Devices International Limited
32
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