FT232RN datasheet(8/40 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

8, 24

No internal connection

RESET#

Input

Active low reset pin. This 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 3.3 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 3.4 UART Interface and CUSB Group (see note 2)

Notes:

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

please refer 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.

FT232RN Datasheet(PDF) 8 Page - Future Technology Devices International Ltd.

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