FT232RN datasheet(10/40 Pages) FTDI

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FT232RN USB UART IC Datasheet

Version 1.0

Document No.: FT_001521 Clearance No.: FTDI#571

Pin No.

Name

Type

Description

5, 12,

13, 23,

25, 29

No internal connection. Do not connect.

RESET#

Input

Active low reset. Can be used by an external device to reset the

FT232RN. If not required can be left unconnected or pulled up to VCC.

TEST

Input

Puts the device into IC test mode. Must be tied to GND for normal

operation, otherwise the device will appear to fail.

OSCI

Input

Input 12MHz Oscillator Cell. Optional – Can be left unconnected for

normal operation. (See Note 1).

OSCO

Output

Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected

for normal operation if internal Oscillator is used. (See Note 1).

Table 3.7 Miscellaneous Signal Group

Pin No.

Name

Type

Description

TXD

Output

Transmit Asynchronous Data Output.

DTR#

Output

Data Terminal Ready Control Output / Handshake Signal.

RTS#

Output

Request to Send Control Output / Handshake Signal.

RXD

Input

Receiving Asynchronous Data Input.

RI#

Input

Ring Indicator Control Input. When remote wake up is enabled in the internal

EEPROM taking RI# low (20ms active low pulse) can be used to resume the

PC USB host controller from suspend.

DSR#

Input

Data Set Ready Control Input / Handshake Signal.

DCD#

Input

Data Carrier Detect Control Input.

CTS#

Input

Clear To Send Control Input / Handshake Signal.

CBUS4

I/O

Configurable CBUS output only Pin. Function of this pin is configured in the

device internal EEPROM. Factory default configuration is SLEEP#. See CBUS

Signal Options, Table 3.9.

CBUS2

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device

internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal

Options, Table 3.9.

CBUS3

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device

internal EEPROM. Factory default configuration is PWREN#. See CBUS Signal

Options, Table 3.9. PWREN# should be used with a 10kΩ resistor pull up.

CBUS1

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device

internal EEPROM. Factory default configuration is RXLED#. See CBUS Signal

Options, Table 3.9.

CBUS0

I/O

Configurable CBUS I/O Pin. Function of this pin is configured in the device

internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal

Options, Table 3.9.

Table 3.8 UART Interface and CBUS Group (see note 1)

Notes:

1. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232RN,

please refer to Section 7.6.

2. When used in Input Mode, the input pins are pulled to VCCIO via internal 200kΩ resistors. These

pins can be programmed to gently pull low during USB suspend (PWREN# = “1”) by setting an

option in the internal EEPROM.

3.5 CBUS Signal Options

The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both

package versions of the FT232RN. These options can be configured in the internal EEPROM using the

software utility FT_PROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The default

configuration is described in Section 8.

FT232RN Datasheet(PDF) 10 Page - Future Technology Devices International Ltd.

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