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| FT232BM Datasheet, PDF (18/24 Pages) Future Technology Devices International Ltd. – USB UART ( USB - Serial) I.C. | |||
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7.4 UART Interface Configuration
FT232BM USB UART ( USB - Serial) I.C.
Figure 10
USB => RS232 Converter Configuration
FT232BM
PWREN# 15
SLEEP# 10
TXD 25
RXD 24
RTS# 23
CTS# 22
DTR# 21
DSR# 20
DCD# 19
RI# 18
TXDEN 16
0.1uF
0.1uF
SP213EHCA
25 SHDN#
EN 11
7 T1In
T1Out 2
22 R4Out
R4In 23
20 T3In
T3Out 1
8 R1Out
R1In 9
6 T2In
T2Out 3
5 R2Out
R2In 4
26 R3Out
R3In 27
19 R5Out
R5In 16
21 T4In
T4Out 28
12 C1+
C2+ 15
14 C1-
17 V-
G
N
D
10
C2- 16
V+ 13
V
C
C
11
VCC
DB9-M
3 TXD
2 RXD
7 RTS
8 CTS
4
DTR
6 DSR
1 DCD
9
RI
5 GND
0.1uF
0.1uF
VCC
0.1uF
VCC
Figure 10 illustrates how to connect the UART interface of the FT232BM to a TTL â RS232 Level Converter I.C. to
make a USB -> RS232 converter using the popular â213â 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 itâs SHDN pin is active
high so connect this to PWREN# instead of SLEEP#.
DS232B Version 1.1 © Future Technology Devices Intl. Ltd. 2002
Page 18 of 24
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