FT232R Future Technology Devices Intl Ltd., FT232R Datasheet - Page 25

• Manufacturer Part Number: FT232R
• Manufacturer: Future Technology Devices Intl Ltd.

Figure 16 -Example USB to MCU UART Interface
Figure 16 is an example of interfacing the FT232R to a Microcontroller (MCU) UART interface. This example uses
TXD and RXD for transmission and reception of data, and RTS# / CTS# hardware handshaking. Also in this example
CBUS0 has been configured as a 12MHz output which is being used to clock the MCU.
Optionally, RI# can be connected to another I/O pin on the MCU and could be used to wake up the USB host
controller from suspend mode. If the MCU is handling power management functions, then a CBUS pin can be
configured as PWREN# and should also be connected to an I/O pin of the MCU.
FT232R USB UART I.C. Datasheet Version 1.02
8.4 USB to MCU UART Interface
5
Vcc
100nF
4.7uF
GND
1
2
3
4
+
GND
+
10nF
Ferrite
Bead
GND
100nF
Vcc
VCC
USBDM
USBDP
VCCIO
NC
RESET#
NC
OSCI
OSCO
3V3OUT
A
G
N
D
FT232R
G
N
D
G
N
D
GND
G
N
D
© Future Technology Devices International Ltd. 2005
T
E
S
T
CBUS0
CBUS1
CBUS2
CBUS3
CBUS4
DCD#
DSR#
DTR#
RTS#
CTS#
RXD
TXD
RI#
12MHz
OUT
PWREN#
CTS#
RTS#
RXD
TXD
CLK_IN
I/O
Vcc