FT4232HL datasheet(11/55 Pages) FTDI

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FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC

Datasheet

Version 2.4

Document No.: FT_000060 Clearance No.: FTDI#78

3.1.4

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.

3.1.4.1

FT4232H pins used as an asynchronous serial interface

Any of the 4 channels of the FT4232H 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.

(see note 1, 2 and 3)

TXDEN = (TTL level). For use with RS485

level converters.

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

Notes

1. When using remote wake-up, ensure the resistors are pulled-up in suspend. Also ensure

peripheral designs do not allow any current sink paths that may partially power the peripheral.

If remote wake-up is enabled, a peripheral is allowed to draw up to 2.5mA in suspend. If remote

wake-up is disabled, the peripheral must draw no more than 500uA in suspend.

3. If a Pull-down is enabled, the FT4232H will not wake up from suspend.

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