參數(shù)資料
型號(hào)： FT232BM
廠(chǎng)商： Electronic Theatre Controls, Inc.
英文描述： Generation of FTDI’s Popular USB UART I.C.
中文描述： 在FTDI的流行的USB UART的新一代集成電路
文件頁(yè)數(shù)： 18/24頁(yè)
文件大?。?/td> 812K
代理商： FT232BM
DS232B Version 1.1 Future Technology Devices Intl. Ltd. 2002
Page 18 of 24
FT232BM USB UART ( USB - Serial) I.C.
7.4 UART Interface Configuration
Figure 10
USB => RS232 Converter Configuration
12
14
2
7
8
4
6
1
9
VCC
SP213EHCA
T1In
T1Out
T2Out
T3Out
T4Out
R1In
T2In
T3In
T4In
R2In
R3In
R4In
R5In
EN
R1Out
R2Out
R3Out
R4Out
R5Out
SHDN#
25
7
22
20
8
6
5
26
19
21
11
2
23
1
9
3
4
27
16
28
VCC
C1+
C1-
C2+
C2-
V
C
C
V-
V+
15
16
10
11
3
13
17
G
N
D
VCC
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
5
FT232BM
PWREN#
SLEEP#
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
RI#
10
TXDEN
25
24
23
22
15
21
20
19
18
16
DB9-M
TXD
RXD
RTS
DTR
CTS
DSR
DCD
RI
GND
Figure 10 illustrates how to connect the UART interface of the FT232BM to a TTL – RS232 Level Converter I.C. to
make a USB -> RS232 converter using the popular “213” series of TTL to RS232 level converters. These devices
have 4 transmitters and 5 receivers in a 28 LD SSOP package and feature an in-built voltage converter to convert
the 5v ( nominal ) VCC to the +/- 9volts required by RS232. An important feature of these devices is the SHDN# pin
which can power down the device to a low quiescent current during USB suspend mode
The device used in the example is a Sipex SP213EHCA which is capable of RS232 communication at up to 500k
baud. If a lower baud rate is acceptable, then several pin compatible alternatives are available such as Sipex
SP213ECA , Maxim MAX213CAI and Analog Devices ADM213E which are good for communication at up to 115,200
baud. If a higher baud rate is desired, use a Maxim MAX3245CAI part which is capable of RS232 communication at
rates of up to 1M baud. The MAX3245 is not pin compatible with the 213 series devices, also it’s SHDN pin is active
high so connect this to PWREN# instead of SLEEP#.
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