FT232RN datasheet(12/40 Pages) FTDI

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FT232RN USB UART IC Datasheet

Version 1.0

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

Function Description

The FT232RN is a USB to serial UART interface device which simplifies USB to serial designs and reduces

external component count by fully integrating an external EEPROM, USB termination resistors and an

integrated clock circuit which requires no external crystal, into the device. It has been designed to operate

efficiently with a USB host controller by using as little as possible of the total USB bandwidth available.

4.1 Key Features

Functional Integration. Fully integrated EEPROM, USB termination resistors, clock generation, AVCC

filtering, POR and LDO regulator.

Configurable CBUS I/O Pin Options. The fully integrated EEPROM allows configuration of the Control

Bus (CBUS) functionality, signal inversion and drive strength selection. There are 5 configurable CBUS I/O

pins. These configurable options are -

1. TXDEN - transmit enable for RS485 designs.

2. PWREN# - Power control for high power, bus powered designs.

3. TXLED# - for pulsing an LED upon transmission of data.

4. RXLED# - for pulsing an LED upon receiving data.

5. TX&RXLED# - which will pulse an LED upon transmission OR reception of data.

6. SLEEP# - indicates that the device going into USB suspend mode.

7. CLK48 / CLK24 / CLK12 / CLK6 - 48MHz, 24MHz, 12MHz, and 6MHz clock output signal options.

8. BitBangWRn / BitBangRDn - Synchronous and asynchronous bit bang mode WR# / RD# strobe

outputs

The CBUS pins can also be individually configured as GPIO pins, similar to asynchronous bit bang mode. It

is possible to use this mode while the UART interface is being used, thus providing up to 4 general purpose

I/O pins which are available during normal operation. An application note, AN232R-01, available from FTDI

website (www.ftdichip.com)describes this feature.

The CBUS lines can be configured with any one of these output options by setting bits in the internal

EEPROM. The device is supplied with the most commonly used pin definitions pre-programmed - see Section

8 for details.

Asynchronous Bit Bang Mode with RD# and WR# Strobes. The FT232RN supports FTDI’s previous

chip generation bit-bang mode. In bit-bang mode, the eight UART lines can be switched from the regular

interface mode to an 8-bit general purpose I/O port. Data packets can be sent to the device, and they will

be sequentially sent to the interface at a rate controlled by an internal timer (equivalent to the baud rate

pre-scaler). With the FT232RN device this mode has been enhanced by outputting the internal RD# and

WR# strobes signals which can be used to allow external logic to be clocked by accesses to the bit-bang

I/O bus. This option will be described more fully in a separate application note AN232R-01 available from

FTDI website (www.ftdichip.com)http:///.

Synchronous Bit Bang Mode. The FT232RN supports synchronous bit bang mode. This mode differs from

asynchronous bit bang mode in that the interface pins are only read when the device is written to. This

makes it easier for the controlling program to measure the response to an output stimulus as the data

returned is synchronous to the output data. An application note, AN232R-01, available from FTDI website

(www.ftdichip.com) describes this feature.

FTDIChip-ID™. The FT232RN also includes the new FTDIChip-ID™ security dongle feature. This FTDIChip-

ID™ feature allows a unique number to be burnt into each device during manufacture. This number cannot

be reprogrammed. This number is only readable over USB and forms a basis of a security dongle which

can be used to protect any customer application software being copied. This allows the possibility of using

the FT232RN in a dongle for software licensing. Further to this, a renewable license scheme can be

implemented based on the FTDIChip-ID™ number when encrypted with other information. This encrypted

number can be stored in the user area of the FT232RN internal EEPROM, and can be decrypted, then

compared with the protected FTDIChip-ID™ to verify that a license is valid. Web based applications can be

used to maintain product licensing this way. An application note, AN232R-02, available from FTDI website

(www.ftdichip.com) describes this feature.

FT232RN Datasheet(PDF) 12 Page - Future Technology Devices International Ltd.

FT232RN Datasheet(HTML) 12 Page - Future Technology Devices International Ltd.

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