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FT232R Datasheet(PDF) 8 Page - Future Technology Devices International Ltd. |
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FT232R Datasheet(HTML) 8 Page - Future Technology Devices International Ltd. |
8 / 29 page FT232R USB UART I.C. Datasheet Version 1.04 © Future Technology Devices International Ltd. 2005 Page 8 4.2 SSOP-28 Package Signal Descriptions Table 1 - SSOP Package Pin Out Description Pin No. Name Type Description USB Interface Group 15 USBDP I/O USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up resistor to 3.3V 16 USBDM I/O USB Data Signal Minus, incorporating internal series resistor. Power and Ground Group 4 VCCIO PWR +1.8V to +5.25V supply to the UART Interface and CBUS group pins (1...3, 5, 6, 9...14, 22, 23). In USB bus powered designs connect to 3V3OUT to drive out at 3.3V levels, or connect to VCC to drive out at 5V CMOS level. 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 a regulator which is supplied by the 5V on the USB bus should be used. 7, 18, 21 GND PWR Device ground supply pins 17 3V3OUT Output 3.3V output from integrated L.D.O. regulator. This pin should be decoupled to ground using a 100nF capacitor. The prime purpose of this pin is to provide the internal 3.3V supply to the USB transceiver 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 FT232R’s VCCIO pin. 20 VCC PWR 3.3V to 5.25V supply to the device core. 25 AGND PWR Device analog ground supply for internal clock multiplier Miscellaneous Signal Group 8, 24 NC NC No internal connection. 19 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. 26 TEST Input Puts the device into I.C. test mode. Must be tied to GND for normal operation. 27 OSCI Input Input to 12MHz Oscillator Cell. Optional - Can be left unconnected for normal operation. * 28 OSCO Output Output from 12MHz Oscillator Cell. Optional - Can be left unconnected for normal operation if internal oscilla- tor is used. * UART Interface and CBUS Group ** 1 TXD Output Transmit Asynchronous Data Output. 2 DTR# Output Data Terminal Ready Control Output / Handshake signal. 3 RTS# Output Request To Send Control Output / Handshake signal. 5 RXD Input Receive Asynchronous Data Input. 6 RI# Input Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low can be used to resume the PC USB host controller from suspend. 9 DSR# Input Data Set Ready Control Input / Handshake signal. 10 DCD# Input Data Carrier Detect Control input. 11 CTS# Input Clear to Send Control input / Handshake signal. 12 CBUS4 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default function is SLEEP#. See CBUS Signal Options, Table 3. 13 CBUS2 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default function is TXDEN. See CBUS Signal Options, Table 3. 14 CBUS3 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default function is PWREN#. See CBUS Signal Options, Table 3. 22 CBUS1 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default function is RXLED#. See CBUS Signal Options, Table 3. 23 CBUS0 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default function is TXLED#. See CBUS Signal Options, Table 3. * Contact FTDI technical support for details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R. ** 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. |
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