Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.05
Clearance No.: FTDI#78
3.4
Configured Pins
The following sections describe the function of the configurable pins referred to in Table
3.1
which is
determined by how the FT4232H is configured.
3.4.1
FT4232H pins used as an asynchronous serial interface
The FT4232H any of the 4 channels can be configured as an asynchronous serial UART interface
(RS232/422/485). When configured in this mode, the pins used and the descriptions of the signals are
shown in Table 3.5.
Channel
A
Pin No.
Channel
B
Pin No.
Channel
C
Pin No.
Channel
D
Pin No.
Name
Type
RS232 Configuration
Description
16
17
18
19
21
22
23
26
27
28
29
30
32
33
38
39
40
41
43
44
45
48
52
53
54
55
57
58
TXD
RXD
RTS#
CTS#
DTR#
DSR#
DCD#
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
INPUT
INPUT
TXD = transmitter output
RXD = receiver input
RTS# = Ready To send
handshake output
CTS# = Clear To Send
handshake input
DTR# = Data Transmit Ready
modem signaling line
DSR# = Data Set Ready modem
signaling line
DCD# = Data Carrier Detect
modem signaling line
RI# = Ring Indicator Control
Input. When the Remote Wake
up option is enabled in the
EEPROM, taking RI# low can be
used to resume the PC USB Host
controller from suspend.
TXDEN = (TTL level). For use
with RS485 level converters.
24
34
46
59
RI#/
TXDEN
INPUT/OUTPUT
Table 3.5 Channel A,B,C and Channel D Asynchronous Serial Interface Configured Pin Descriptions
Copyright © 2009 Future Technology Devices International Limited
12
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
