FT2232D datasheet(29/56 Pages) FTDI

29 / 56 page

DS2232D Version 0.91

FT2232D Dual USB UART / FIFO I.C.

9.0 Signal Descriptions By IO Mode and Interface Channel Configurations

9.1 232 UART Interface Mode Signal Descriptions and Interface Configurations

When either Channel A or Channel B are in 232 UART mode the IO signal lines are configured as follows:-

Pin#

Signal

Type

Description

Channel A

Channel B

TXD

OUTPUT Transmit Asynchronous Data Output

RXD

INPUT

Receive Asynchronous Data Input

**Note 16

RTS#

OUTPUT Request To Send Control Output / Handshake signal

CTS#

INPUT

Clear To Send Control Input / Handshake signal

**Note 16

DTR#

OUTPUT Data Terminal Ready Control Output / Handshake signal

DSR#

INPUT

Data Set Ready Control Input / Handshake signal

**Note 16

DCD#

INPUT

Data Carrier Detect Control Input

**Note 16

RI#

INPUT

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.

**Note 16

TXDEN

OUTPUT Enable Transmit Data for RS485

SLEEP# OUTPUT Goes low during USB Suspend Mode. Typically used to power-

down an external TTL to RS232 level converter I.C. in USB to

RS232 converter designs.

RXLED# O.C.

LED Drive - Pulses Low when Transmitting Data via USB.

TXLED# O.C

LED Drive - Pulses Low when Receiving Data via USB.

SI/WU

INPUT

The Send Immediate / WakeUp signal combines two functions

on a single pin. If USB is in suspend mode (PWREN# = 1) and

remote wakeup is enabled in the EEPROM , strobing this pin

low will cause the device to request a resume on the USB Bus.

Normally, this can be used to wake up the Host PC.

During normal operation (PWREN# = 0), if this pin is strobed low

any data in the device TX buffer will be sent out over USB on the

next Bulk-IN request from the drivers regardless of the pending

packet size. This can be used to optimise USB transfer speed for

some applications. Tie this pin to VCCIO if not used.

**Note 16 : These pins are pulled to up VCCIO via internal 200K resistors during Reset and USB Suspend mode.

These can be programmed to gently pull low during USB suspend ( PWREN# = “1” ) by setting this option in the

EEPROM.

FT2232D Datasheet(PDF) 29 Page - Future Technology Devices International Ltd.

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