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| FT2232H_12 Datasheet, PDF (54/67 Pages) Future Technology Devices International Ltd. – Dual High Speed USB to Multipurpose UART/FIFO IC | |||
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Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Version 2.21
Clearance No.: FTDI#77
Self Powered application example 2: Self powered configuration (with additional 1.8V LDO voltage
regulator for VCORE)
+3.3V
+3.3V
Ext. Power Supply
100nF
GND
1
2
GND
LDO +1.8V
Vin Vout
GND
+1.8V
100nF
4.7uF 4.7uF 100nF 100nF
GND GND GND GND
GND
GND
LDO +3.3V
Vin Vout
GND
+3.3V
50 VREGIN
49 VREGOUT
VBUS 1
D-
D+
2
3
GND
VBUS
0?
GND
100nF
GND
GND
100nF
GND
+3.3V
+3.3V
1K
12K
GND
7
8
DM
DP
6 REF
14 RESET#
10K 10K 10K
+3.3V
1
6
3
2
5
CS
VCC 8
ORG
D
SCL
93C46 Q
DU
4
7
GND
2.2K
GND
EECLK
EEDATA
63
62
61
EECS
EECLK
EEDATA
2 OSCI
1
3
12MHz
3 OSCO
13 TEST
27pF
GND
27pF
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
ADBUS0
ADBUS1
ADBUS2
ADBUS3
16
17
18
19
ADBUS4 21
ADBUS5 22
ADBUS6 23
ADBUS7 24
ACBUS0 26
ACBUS1 27
ACBUS2 28
ACBUS3 29
ACBUS4 30
ACBUS5 32
ACBUS6 33
ACBUS7 34
BDBUS0 38
BDBUS1 39
BDBUS2 40
BDBUS3 41
BDBUS4 43
BDBUS5 44
BDBUS6 45
BDBUS7 46
BCBUS0
BCBUS1
48
52
BCBUS2 53
BCBUS3 54
BCBUS4 55
BCBUS5 57
BCBUS6 58
BCBUS7 59
PWREN# 60
SUSPEND# 36
GND
VBUS
4.7K
10K
GND
Figure 6.4 Self Powered Configuration Example 2
Figure 6.4 illustrates the FT2232H in a typical USB self powered configuration similar to Figure 6.3. The
difference here is that the +1.8V for the FT2232H core has been regulated from the external power
supply.
Note that in this set-up, the EEPROM should be configured for self-powered operation and the option
âsuspend on DBUS7 lowâ selected in MPROG. Also this configuration uses the pin BCBUS7, so this
assumes that MPSSE mode is not selected.
Copyright © 2012 Future Technology Devices International Limited
54
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