Datasheet FT232R (FTDI) - 27

FT232R USB UART IC Datasheet Version 2.16
Document No.: FT_000053 Clearance No.: FTDI# 38
7.4 USB to MCU UART Interface
Vcc Vcc Ferrite Bead 1 RXD TXD VCC 2 TXD RXD USBDM RTS# 3 CTS# USBDP CTS# RTS# 4 10nF + VCCIO DTR#
FT232R
NC M 5 DSR# icro RESET# c DCD# o n t NC r SHIELD o l RI# ler OSCI 12MHz GND CBUS0 CLK_IN OSCO OUT Vcc Vcc CBUS1 10K 3V3OUT CBUS2 100nF 4.7uF + A T CBUS3 I/O G G G G E PWREN# N N N N S CBUS4 100nF D D D D T GND GND GND
Figure 7.4 USB to MCU UART Interface
An example of using the FT232R as a USB to Microcontroller (MCU) UART interface is shown in Figure 7.4. In this application the FT232R uses TXD and RXD for transmission and reception of data, and RTS# / CTS# signals for hardware handshaking. Also in this example CBUS0 has been configured as a 12MHz output to clock the MCU. Optionally, RI# could be connected to another I/O pin on the MCU and used to wake up the USB host controller from suspend mode. If the MCU is handling power management functions, then a CBUS pin can be configured as PWREN# and would also be connected to an I/O pin of the MCU. Copyright © Future Technology Devices International Limited 27 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