EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90

© Future Technology Devices International Ltd. 2005

Page 7

3.2 Header Pin and Jumper Signal Descriptions

Table 1 - Module Pin Out Description - Jumper J1

Pin No. Name

Type Description

1

VCC

Output

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.

2

VCCIO

Input

+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

VCC3O

Output

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).

Table 2 - Module Pin Out Description - 8 Pin Header J2

Pin No. Name

Type Description

1

VCC

Output

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.

2

CBUS0

Input

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, Table 4.*

3

CBUS1

Output

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default

4

CBUS2

Output

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default

5

CBUS3

Output

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default

6

VCC3O

Output

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.

7

RESET#

Input

Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up

to VCCIO.

3

GND

GND

Module ground supply pins

Table 3 - Module Pin Out Description - Jumper J3

Pin No. Name

Type Description

1

CBUS0

Output

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, Table 4.*

Connect to LP1 to drive the red receive data LED (module default)

2

LP1

Input

Red receive data LED

3

CBUS1

Output

Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default

Connect to LP2 to drive the green transmit data LED (module default)

3

LP2

Intput

Green transmit data LED

* 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.