FT4232H datasheet(12/45 Pages) FTDI

12 / 45 page

Document No.: FT_000060

FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC

Datasheet Version 2.2

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.

(see note 1, 2 and 3)

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

Notes

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 4232H will not wake up from suspend.

FT4232H Datasheet(PDF) 12 Page - Future Technology Devices International Ltd.

FT4232H Datasheet(HTML) 12 Page - Future Technology Devices International Ltd.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL