FT232RL-2000 FTDI [Future Technology Devices International Ltd.], FT232RL-2000 Datasheet - Page 31

• Manufacturer Part Number: FT232RL-2000
• Description: USB UART IC - Single chip USB to asynchronous serial data transfer interface
• Manufacturer: FTDI [Future Technology Devices International Ltd.]

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.
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.
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.
Copyright © 2010 Future Technology Devices International Limited
FT232R
FT232R
CBUS[0...4]
CBUS[0...4]
CBUS[0...4]
FT232R USB UART IC Datasheet Version 2.07
TXLED#
RXLED#
TX
TX&RXLED#
270R
LED
VCCIO
VCCIO
270R
Document No.: FT_000053
270R
Clearance No.: FTDI# 38
RX
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