Document No.: FT_000061
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 2.09
Clearance No.: FTDI#77
3.4 Configured Pins
The following sections describe the function of the configurable pins referred to in the table given in
Section 3.2 which is determined by how the FT2232H is configured.
3.4.1 FT2232H pins used in an RS232 interface
The FT2232H channel A or channel B can be configured as an RS232 interface. When configured in this
mode, the pins used and the descriptions of the signals are shown in Table 3.4.
Channel A
Pin No.
16
17
18
19
21
22
23
Channel B
Pin No.
38
39
40
41
43
44
45
Name
Type
RS232 Configuration Description
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.
(Also see note 1, 2, 3 in section 4.12)
TXDEN = (TTL level). For use with RS485 level converters.
24
46
RI#
INPUT
26
29
48
54
TXDEN
RXLED#
OUTPUT
OUTPUT
RXLED = Receive signaling output. Pulses low when receiving
data (RXD) via USB. This should be connected to an LED.
TXLED = Transmit signaling output. Pulses low when
30
55
TXLED#
OUTPUT
transmitting data (TXD) via USB. This should be connected to
an LED.
Table 3.4 Channel A and Channel B RS232 Configured Pin Descriptions
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