FT4232H datasheet(12/43 Pages) FTDI

12 / 43 page

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

Pin No.

Channel

Pin No.

Channel

Pin No.

Channel

Pin No.

Name

Type

RS232 Configuration

Description

TXD

OUTPUT

TXD = transmitter output

RXD

INPUT

RXD = receiver input

RTS#

OUTPUT

RTS# = Ready To send

handshake output

CTS#

INPUT

CTS# = Clear To Send

handshake input

DTR#

OUTPUT

DTR# = Data Transmit Ready

modem signaling line

DSR#

INPUT

DSR# = Data Set Ready modem

signaling line

DCD#

INPUT

DCD# = Data Carrier Detect

modem signaling line

RI#/

TXDEN

INPUT/OUTPUT

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.

Table 3.5 Channel A,B,C and Channel D Asynchronous Serial Interface Configured Pin Descriptions

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