Copyright © 2013 Future Technology Devices International Limited

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FT231X USB TO FULL HANDSHAKE UART IC

Datasheet

Version 1.2

Document No.: FT_000565 Clearance No.:

FTDI# 261

FT231X

CBUS[0...3]

CBUS[0...3]

VCCIO

TX

TXLED#

RXLED#

RX

270R

270R

Figure 7.7 Dual LED Configuration

An example of using the FT231X to drive LEDs is shown in Figure 7.7. 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.

FT231X

CBUS [0...3]

TX& RXLED#

270R

VCCIO

LED

Figure 7.8 Single LED Configuration

Another example of using the FT231X to drive LEDs is shown in Figure 7.8. 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 FT231X will drive only a single LED.