3.2 Header Pin and Jumper Signal Descriptions
Table 1 - Module Pin Out Description - Jumper J1
Pin No. Name
1
VCC
Page 7
Type
Output
Description
5V Power output USB port. For a low power USB bus powered design, up to 100mA can be sourced from the
5V supply on the USB bus. A maximum of 500mA can be sourced from the USB bus in a high power USB bus
powered design.
+1.8V to +5.25V supply to the FT232RL’s UART Interface and CBUS I/O pins. In USB bus powered designs
connect to 3V3 to drive out at 3.3V levels (connect VCCIO to VCC3O), or connect to VCC to drive out at 5V
CMOS level (connect VCCIO to VCC). This pin can also be supplied with an external 1.8V - 2.8V supply in
order to drive out at lower levels. It should be noted that in this case this supply should originate from the
same source as the supply to Vcc. This means that in bus powered designs (like the EVAL232R for example)
a regulator which is supplied by the 5V on the USB bus should be used.
3.3V output from FT232RL’s integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb
with a 100nF capacitor. The prime purpose of this pin is to provide the internal 3.3V supply to the USB trans-
ceiver cell and the internal 1.5kΩ pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power
external logic if required. This pin can also be used to supply the FT232RL’s VCCIO pin by connecting this pin
to pin 3 (VCCIO).
2
VCCIO
Input
3
VCC3O
Output
Table 2 - Module Pin Out Description - 8 Pin Header J2
Pin No. Name
1
VCC
Type
Output
Description
5V Power output USB port. For a low power USB bus powered design, up to 100mA can be sourced from the
5V supply on the USB bus. A maximum of 500mA can be sourced from the USB bus in a high power USB bus
powered design.
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is RXLED#. See CBUS Signal Options,
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is TXLED#. See CBUS Signal Options,
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is PWREN#. See CBUS Signal Options,
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is PWREN#. See CBUS Signal Options,
3.3V output from FT232RL’s integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb
with a 100nF capacitor. The prime purpose of this pin is to provide the internal 3.3V supply to the USB trans-
ceiver cell and the internal 1.5kΩ pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power
external logic if required.
Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up
to VCCIO.
Module ground supply pins
2
3
4
5
6
CBUS0
CBUS1
CBUS2
CBUS3
VCC3O
Input
Output
Output
Output
Output
7
3
RESET#
GND
Input
GND
Table 3 - Module Pin Out Description - Jumper J3
Pin No. Name
1
CBUS0
Type
Output
Description
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is RXLED#. See CBUS Signal Options,
Connect to LP1 to drive the red receive data LED (module default)
Red receive data LED
Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default
pin function for the EVAL232R module is TXLED#. See CBUS Signal Options,
Connect to LP2 to drive the green transmit data LED (module default)
Green transmit data LED
2
3
LP1
CBUS1
Input
Output
3
LP2
Intput
* When used in Input Mode, these pins are pulled to VCCIO via internal 200kΩ resistors. These pins can be
programmed to gently pull low during USB suspend ( PWREN# = “1” ) by setting an option in the internal EEPROM.
EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90
© Future Technology Devices International Ltd. 2005
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
