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FT2232C 데이터시트(PDF) 21 Page - Future Technology Devices International Ltd.

부품명 FT2232C
상세설명  Dual USB UART / FIFO I.C.
PDF  51 Pages
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제조업체  FTDI [Future Technology Devices International Ltd.]
홈페이지  http://www.ftdichip.com
Logo FTDI - Future Technology Devices International Ltd.

FT2232C 데이터시트(HTML) 21 Page - Future Technology Devices International Ltd.

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DS2232C Version 1.4
© Future Technology Devices International Ltd. 2005 Page 21 of 54
FT2232C Dual USB UART / FIFO I.C.
8.3 USB Bus Powered and Self Powered Configuration
Figure 8 - USB Bus Powered Configuration
Figure 8 illustrates the FT2232C in a typical USB bus powered configuration. A USB Bus Powered device gets its
power from the USB bus. Basic rules for USB Bus power devices are as follows –
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500μA.
c) A High Power USB Bus Powered Device (one that draws more than 100mA) should use the PWREN# pin to keep
the current below 100mA on plug-in and 500μA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub
e) No device can draw more that 500mA from the USB Bus.
The power descriptor in the EEPROM should be programmed to match the current draw required by the device.
A Ferrite Bead is connected in series with USB power to prevent noise from the device and associated circuitry (EMI)
being radiated down the USB cable to the Host. The value of the Ferrite Bead depends on the total current required
by the circuit – a suitable range of Ferrite Beads is available from Steward (
www.steward.com) for example Steward
Part # MI0805K400R-00 also available from
DigiKey, Part # 240-1035-1.
0.1uF
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT2232C
USB DP
7
5
V
C
C
V
C
C
V
C
C
I
O
A
3
42
14
1
2
3
4
Ferrite Bead
1.5K
33nF
3v3OUT
6
470R
A
V
C
C
46
G
N
D
G
N
D
A
G
N
D
18 25 34
10nF
VCC
RESET#
4
Decoupling Capacitors
10uF
VCC
0.1uF
0.1uF
+
31
V
C
C
I
O
A
G
N
D
G
N
D
9
45
TEST
47
EECS
EESK
EEDATA
10K
48
1
2
6MHz
27pF
27pF
XTIN
43
44 XTOUT
5



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