FT232R datasheet(31/43 Pages) FTDI

31 / 43 page

Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.07

Clearance No.: FTDI# 38

7.5 LED Interface

Any of the CBUS I/O pins can be configured to drive an LED. The FT232R has 3 configuration options for

driving LEDs from the CBUS. These are TXLED#, RXLED#, and TX&RXLED#. Refer to Section 3.5 for

configuration options.

FT232R

CBUS[0...4]

VCCIO

TXLED#

RXLED#

270R

Figure 7.5 Dual LED Configuration

An example of using the FT232R to drive LEDs is shown in Figure 7.5. In this application one of the CBUS

pins is used to indicate transmission of data (TXLED#) and another is used to indicate receiving data

(RXLED#). When data is being transmitted or received the respective pins will drive from tri-state to low

in order to provide indication on the LEDs of data transfer. A digital one-shot is used so that even a small

percentage of data transfer is visible to the end user.

FT232R

CBUS[0...4]

TX&RXLED#

270R

VCCIO

LED

Figure 7.6 Single LED Configuration

Another example of using the FT232R to drive LEDs is shown in Figure 7.6. In this example one of the

CBUS pins is used to indicate when data is being transmitted or received by the device (TX&RXLED). In

this configuration the FT232R will drive only a single LED.

FT232R Datasheet(PDF) 31 Page - Future Technology Devices International Ltd.