Datasheet FT232R (FTDI) - 10

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FT232R USB UART IC Datasheet Version 2.16
Document No.: FT_000053 Clearance No.: FTDI# 38
Pin No. Name Type Description
to ground using a 100nF capacitor. The purpose of this output 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 VCCIO pin. 19 VCC PWR +3.3V to +5.25V supply to the device core. (See Note 1). 24 AGND PWR Device analogue ground supply for internal clock multiplier.
Table 3.6 Power and Ground Group Pin No. Name Type Description
5, 12, 13, 23, NC NC No internal connection. Do not connect. 25, 29 18 RESET# Input Active low reset. Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCC. Puts the device into IC test mode. Must be tied to GND for normal 26 TEST Input operation, otherwise the device will appear to fail. 27 OSCI Input Input 12MHz Oscillator Cell. Optional – Can be left unconnected for normal operation. (See Note 2). Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for 28 OSCO Output normal operation if internal Oscillator is used. (See Note 2).
Table 3.7 Miscellaneous Signal Group Pin No. Name Type Description
30 TXD Output Transmit Asynchronous Data Output. 31 DTR# Output Data Terminal Ready Control Output / Handshake Signal. 32 RTS# Output Request to Send Control Output / Handshake Signal. 2 RXD Input Receiving Asynchronous Data Input. Ring Indicator Control Input. When remote wake up is enabled in the internal 3 RI# Input EEPROM taking RI# low (20ms active low pulse) can be used to resume the PC USB host controller from suspend. 6 DSR# Input Data Set Ready Control Input / Handshake Signal. 7 DCD# Input Data Carrier Detect Control Input. 8 CTS# Input Clear To Send Control Input / Handshake Signal. Configurable CBUS output only Pin. Function of this pin is configured in the 9 CBUS4 I/O device internal EEPROM. Factory default configuration is SLEEP#. See CBUS Signal Options, Table 3.9. Configurable CBUS I/O Pin. Function of this pin is configured in the device 10 CBUS2 I/O internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9. Configurable CBUS I/O Pin. Function of this pin is configured in the device 11 CBUS3 I/O internal EEPROM. Factory default configuration is PWREN#. See CBUS Signal Options, Table 3.9. PWREN# should be used with a 10kΩ resistor pull up. Configurable CBUS I/O Pin. Function of this pin is configured in the device 21 CBUS1 I/O internal EEPROM. Factory default configuration is RXLED#. See CBUS Signal Options, Table 3.9. Configurable CBUS I/O Pin. Function of this pin is configured in the device 22 CBUS0 I/O internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9.
Table 3.8 UART Interface and CBUS Group (see note 3) Notes:
1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the internal clock generator. Operation at +3.3V is possible using an external crystal oscillator. 2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R, please refer to Section 7.6. Copyright © Future Technology Devices International Limited 10 Document Outline 1 Typical Applications 1.1 Driver Support 1.2 Part Numbers 1.3 USB Compliant 2 FT232R Block Diagram 3 Device Pin Out and Signal Description 3.1 28-LD SSOP Package 3.2 SSOP Package Pin Out Description 3.3 QFN-32 Package 3.4 QFN-32 Package Signal Description 3.5 CBUS Signal Options 4 Function Description 4.1 Key Features 4.2 Functional Block Descriptions 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings 5.2 DC Characteristics 5.3 EEPROM Reliability Characteristics 5.4 Internal Clock Characteristics 5.5 Thermal Characteristics 6 USB Power Configurations 6.1 USB Bus Powered Configuration 6.2 Self Powered Configuration 6.3 USB Bus Powered with Power Switching Configuration 6.4 USB Bus Powered with Selectable External Logic Supply 7 Application Examples 7.1 USB to RS232 Converter 7.2 USB to RS485 Converter 7.3 USB to RS422 Converter 7.4 USB to MCU UART Interface 7.5 LED Interface 7.6 Using the External Oscillator 8 Internal EEPROM Configuration 9 Package Parameters 9.1 SSOP-28 Package Dimensions 9.2 QFN-32 Package Dimensions 9.3 Solder Reflow Profile 10 Alternative Parts 11 Contact Information Appendix A – References Document References Acronyms and Abbreviations Appendix B – List of Figures and Tables List of Figures List of Tables Appendix C – Revision History