Datasheet FT232R (FTDI) - 8

Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.11 Clearance No.: FTDI# 38 Pin No. Name Type Description
7, 18, GND PWR Device ground supply pins 21 +3.3V output from integrated LDO regulator. This pin should be decoupled to ground using a 100nF capacitor. The main use of this pin is to provide the internal 17 3V3OUT Output +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. 20 VCC PWR +3.3V to +5.25V supply to the device core. (see Note 1) 25 AGND PWR Device analogue ground supply for internal clock multiplier
Table 3.2 Power and Ground Group Pin No. Name Type Description
8, 24 NC NC No internal connection 19 RESET# Input Active low reset pin. This can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCC. 26 TEST Input Puts the device into IC test mode. Must be tied to GND for normal operation, otherwise the device will appear to fail. Input 12MHz Oscillator Cell. Optional – Can be left unconnected for 27 OSCI Input normal operation. (see Note 2) 28 OSCO Output Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for normal operation if internal Oscillator is used. (see Note 2)
Table 3.3 Miscellaneous Signal Group Pin No. Name Type Description
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 Receiving Asynchronous Data Input. Ring Indicator Control Input. When remote wake up is enabled in the 6 RI# Input internal EEPROM taking RI# low (20ms active low pulse) 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. Copyright © 2010 Future Technology Devices International Limited 8 Document Outline 1 Typical Applications 1.1 Driver Support 1.2 Part Numbers Note: Packing codes for xxxx is: 1.1 1.1 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 1.1 1.1 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 Coverter 1.1 1.1 1.1 7.3 USB to RS422 Converter 7.4 USB to MCU UART Interface 1.1 1.1 1.1 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 QFN-32 Package Typical Pad Layout 1.1 9.4 QFN-32 Package Typical Solder Paste Diagram 9.5 Solder Reflow Profile 10 Alternative Parts 11 Contact Information Appendix A – References Appendix B - List of Figures and Tables Appendix C - Revision History