Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.8
Clearance No.: FTDI #199
4.11 RS232 UART Mode LED Interface Description
When configured in UART mode the FT232H has two IO pins dedicated to controlling LED status
indicators, one for transmitted data the other for received data. When data is being transmitted or
received the respective pins drive from tri-state to low in order to provide indication on the LED’s of data
transfer. A digital one-shot timer is used so that even a small percentage of data transfer is visible to the
end user.
Figure 4.23 Dual LED UART Configuration
Figure 4.23 shows a configuration using two individual LED’s – one for transmitted data the other for
received data.
Figure 4.24 Single LED UART Configuration
In Figure 4.24 transmit and receive LED indicators are wire-OR’ed together to give a single LED indicator
which indicates any transmit or receive data activity.
Note that the LED’s are connected to the same supply as VCCIO.
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