FT232R

Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Future Technology Devices International Ltd. FT232R USB UART IC The FT232R is a USB to serial UART interface with the following advanced features: Single chip USB to asynchronous serial data transfer interface. Entire USB protocol handled on the chip. No USB specific firmware programming required. Fully integrated 1024 bit EEPROM storing device descriptors and CBUS I/O configuration. Fully integrated USB termination resistors. Fully integrated clock generation with no external crystal required plus optional clock output selection enabling a glue-less interface to external MCU or FPGA. Data transfer rates from 300 baud to 3 Mbaud (RS422, RS485, RS232 ) at TTL levels. 128 byte receive buffer and 256 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput. FTDI‟s royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases. Unique USB FTDIChip-ID™ feature. Configurable CBUS I/O pins. Transmit and receive LED drive signals. UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity FIFO receive and transmit buffers for high data throughput. Synchronous and asynchronous bit bang interface options with RD# and WR# strobes. Device supplied pre-programmed with unique USB serial number. Supports bus powered, self powered and highpower bus powered USB configurations. Integrated +3.3V level converter for USB I/O. Integrated level converter on UART and CBUS for interfacing to between +1.8V and +5V logic. True 5V/3.3V/2.8V/1.8V CMOS drive output and TTL input. Configurable I/O pin output drive strength. Integrated power-on-reset circuit. Fully integrated AVCC supply filtering - no external filtering required. UART signal inversion option. +3.3V (using external oscillator) to +5.25V (internal oscillator) Single Supply Operation. Low operating and USB suspend current. Low USB bandwidth consumption. UHCI/OHCI/EHCI host controller compatible. USB 2.0 Full Speed compatible. -40°C to 85°C extended operating temperature range. Available in compact Pb-free 28 Pin SSOP and QFN-32 packages (both RoHS compliant). Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or re produced in any material or electronic form w ithout the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology Devices Internationa l Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park , Glasgow G41 1HH United Kingdom. Scotland Registered Company Number: SC136640 Copyright © 2010 Future Technology Devices International Limited 1 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 1 Typical Applications USB to RS232/RS422/RS485 Converters Upgrading Legacy Peripherals to USB Cellular and Cordless Phone USB data transfer cables and interfaces Interfacing MCU/PLD/FPGA based designs to USB USB Audio and Low Bandwidth Video data transfer PDA to USB data transfer USB Smart Card Readers USB Instrumentation USB Industrial Control USB MP3 Player Interface USB FLASH Card Reader and Writers Set Top Box PC - USB interface USB Digital Camera Interface USB Hardware Modems USB Wireless Modems USB Bar Code Readers USB Software and Hardware Encryption Dongles 1.1 Driver Support Royalty free VIRTUAL COM PORT (VCP) DRIVERS for... Windows 98, 98SE, ME, 2000, Server 2003, XP and Server 2008 Windows 7 32,64-bit Windows XP and XP 64-bit Windows Vista and Vista 64-bit Windows XP Embedded Windows CE 4.2, 5.0 and 6.0 Mac OS 8/9, OS-X Linux 2.4 and greater The drivers listed above are all available to download for free from FTDI website (www.ftdichip.com). Various 3rd party drivers are also available for other operating systems - see FTDI website (www.ftdichip.com) for details. For driver installation, please refer to http://www.ftdichip.com/Documents/InstallGuides.htm Royalty free D2XX Direct Drivers (USB Drivers + DLL S/W Interface) Windows 98, 98SE, ME, 2000, Server 2003, XP and Server 2008 Windows 7 32,64-bit Windows XP and XP 64-bit Windows Vista and Vista 64-bit Windows XP Embedded Windows CE 4.2, 5.0 and 6.0 Linux 2.4 and greater 1.2 Part Numbers Part Number Package FT232RQ-xxxx FT232RL-xxxx Note: Packing codes for xxxx is: 32 Pin QFN 28 Pin SSOP - Reel: Taped and Reel, (SSOP is 2,000pcs per reel, QFN is 6,000pcs per reel). - Tube: Tube packing, 47pcs per tube (SSOP only) - Tray: Tray packing, 490pcs per tray (QFN only) For example: FT232RQ-Reel is 6,000pcs taped and reel packing Copyright © 2010 Future Technology Devices International Limited 2 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 1.3 USB Compliant The FT232R is fully compliant with the USB 2.0 specification and has been given the USB -IF Test-ID (TID) 40680004. Copyright © 2010 Future Technology Devices International Limited 3 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 2 VCC FT232R Block Diagram SLEEP# 48MHz 3.3 Volt LDO Regulator Baud Rate Generator 3V3OUT FIFO RX Buffer USBDP USBDM USB Transceiver with Integrated Series Resistors and 1.5K Pullup Serial Interface Engine ( SIE ) USB Protocol Engine UART FIFO Controller UART Controller with Programmable Signal Inversion DBUS0 DBUS1 DBUS2 DBUS3 DBUS4 DBUS5 DBUS6 DBUS7 Internal EEPROM USB DPLL 3V3OUT CBUS0 CBUS1 CBUS2 CBUS3 CBUS4 FIFO TX Buffer OSCO (optional) OCSI (optional) Internal 12MHz Oscillator x4 Clock Multiplier RESET# To USB Transeiver Cell Reset Generator 48MHz TEST GND Figure 2.1 FT232R Block Diagram For a description of each function please refer to Section 4. Copyright © 2010 Future Technology Devices International Limited 4 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Table of Contents 1 Typical Applications ........................................................................ 2 1.1 1.2 1.3 Driver Support .................................................................................... 2 Part Numbers...................................................................................... 2 USB Compliant .................................................................................... 3 Note: Packing codes for xxxx is: .................................................................. 2 2 3 FT232R Block Diagram .................................................................... 4 Device Pin Out and Signal Description ............................................ 7 3.1 3.2 3.3 3.4 3.5 28-LD SSOP Package .......................................................................... 7 SSOP Package Pin Out Description...................................................... 7 QFN-32 Package ............................................................................... 10 QFN-32 Package Signal Description .................................................. 10 CBUS Signal Options ......................................................................... 13 Key Features ..................................................................................... 14 Functional Block Descriptions ........................................................... 15 Absolute Maximum Ratings............................................................... 17 DC Characteristics............................................................................. 18 EEPROM Reliability Characteristics ................................................... 21 Internal Clock Characteristics ........................................................... 21 USB Bus Powered Configuration ...................................................... 23 Self Powered Configuration .............................................................. 24 USB Bus Powered with Power Switching Configuration .................... 25 USB Bus Powered with Selectable External Logic Supply .................. 26 USB to RS232 Converter ................................................................... 27 USB to RS485 Coverter ..................................................................... 28 USB to RS422 Converter ................................................................... 29 USB to MCU UART Interface .............................................................. 30 LED Interface .................................................................................... 31 Using the External Oscillator ............................................................ 32 4 Function Description ..................................................................... 14 4.1 4.2 5 Devices Characteristics and Ratings.............................................. 17 5.1 5.2 5.3 5.4 6 USB Power Configurations ............................................................ 23 6.1 6.2 6.3 6.4 7 Application Examples .................................................................... 27 7.1 7.2 7.3 7.4 7.5 7.6 8 9 Internal EEPROM Configuration .................................................... 33 Package Parameters ..................................................................... 35 9.1 SSOP-28 Package Dimensions .......................................................... 35 Copyright © 2010 Future Technology Devices International Limited 5 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 9.2 9.3 9.4 9.5 QFN-32 Package Dimensions ............................................................ 36 QFN-32 Package Typical Pad Layout ................................................. 37 QFN-32 Package Typical Solder Paste Diagram ................................. 37 Solder Reflow Profile ........................................................................ 38 10 Contact Information ................................................................... 39 Appendix A – References ........................................................................... 40 Appendix B - List of Figures and Tables ..................................................... 41 Appendix C - Revision History .................................................................... 43 Copyright © 2010 Future Technology Devices International Limited 6 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 3 Device Pin Out and Signal Description 3.1 28-LD SSOP Package 4 1 5 3 11 2 9 10 6 23 22 13 14 12 XXXXXXXXXXXX TXD DTR# RTS# 1 28 OSCO OSCI TEST VCCIO VCC TXD RXD 20 16 15 USBDM RTS# USBDP CTS# FT232RL 14 Name USBDP USBDM Name VCCIO GND VCCIO RXD RI# GND NC DSR# DCD# CTS# CBUS4 CBUS2 CBUS3 AGND NC 8 FT232RL NC RESET# NC OSCI OSCO DTR# DSR# DCD# RI# CBUS0 CBUS1 Figure 3.1 SSOP Package Pin Out and Schematic Symbol 3.2 SSOP Package Pin Out Description Note: The convention used throughout this document for active low signals is the signal name followed by a# Pin No. 15 16 Type I/O I/O Description USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up resistor to 3.3V. USB Data Signal Minus, incorporating internal series resistor. Table 3.1 USB Interface Group YYXX-A FTDI 15 CBUS0 CBUS1 GND VCC RESET# GND 3V3OUT USBDM USBDP 19 24 27 28 17 3V3OUT A G N D 25 7 G N D 18 G N D 21 G N D 26 T E S T CBUS2 CBUS3 CBUS4 Pin No. Type Description +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 this pin to 3V3OUT pin 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 to +2.8V supply in order to dr ive outputs 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. Device ground supply pins 4 PWR 7, 18, 21 PWR Copyright © 2010 Future Technology Devices International Limited 7 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Pin No. Name Type Description +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 +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. +3.3V to +5.25V supply to the device core. (see Note 1) Device analogue ground supply for internal clock multiplier 17 3V3OUT Output 20 25 VCC AGND PWR PWR Table 3.2 Power and Ground Group Pin No. Name Type Description 8, 24 19 NC RESET# NC Input No internal connection 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. 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 normal operation. (see Note 2) Output from 12MHZ Oscillator Cell. Optional – Can be left unconnected for normal operation if internal Oscillator is used. (see Note 2) 26 TEST Input 27 OSCI Input 28 OSCO Output Table 3.3 Miscellaneous Signal Group Pin No. 1 2 3 5 Name TXD DTR# RTS# RXD Type Output Output Output Input Description Transmit Asynchronous Data Output. Data Terminal Ready Control Output / Handshake Signal. Request to Send Control Output / Handshake Signal. Receiving Asynchronous Data Input. Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low (20ms active low pulse) can be used to resume the PC USB host controller from suspend. Data Set Ready Control Input / Handshake Signal. Data Carrier Detect Control Input. Clear To Send Control Input / Handshake Signal. Configurable CBUS output only Pin. Function of this pin is configured in the 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 internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9. 8 6 RI# Input 9 10 11 DSR# DCD# CTS# Input Input Input 12 CBUS4 I/O 13 CBUS2 I/O Copyright © 2010 Future Technology Devices International Limited Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Pin No. Name Type Description Configurable CBUS I/O Pin. Function of this pin is configured in the device 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 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 internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9. 14 CBUS3 I/O 22 CBUS1 I/O 23 CBUS0 I/O Table 3.4 UART Interface and CUSB 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 Section 7.6 3. When used in Input Mode, the input 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. Copyright © 2010 Future Technology Devices International Limited 9 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 3.3 QFN-32 Package 32 25 1 YYXX-A XXXXXXX 8 9 FTDI 16 24 1 19 15 14 5 VCCIO VCC TXD RXD 30 2 32 8 31 6 7 3 22 21 10 11 9 USBDM RTS# USBDP NC NC NC NC NC RESET# NC OSCI OSCO 3V3OUT A G N D 24 4 G N D 17 G N D 20 G N D 26 T E S T CBUS2 CBUS3 CBUS4 CBUS0 CBUS1 DSR# DCD# RI# CTS# FT232RQ OSCO DTR# RTS# TEST 26 17 12 13 25 29 FT232RQ DTR# OSCI TX D NC NC 25 27 28 29 30 31 32 18 23 AGND 24 1 2 3 4 5 6 7 8 VCCIO RXD RI# GND NC DSR# DCD# CTS# 27 28 16 NC 23 CBUS0 22 CBUS1 21 GND VCC 20 19 RESET# 18 GND 17 16 15 14 13 12 11 10 9 CBUS3 CBUS4 Figure 3.2 QFN-32 Package Pin Out and schematic symbol 3.4 QFN-32 Package Signal Description Pin No. Name Type Description USB Data Signal Plus, incorporating internal series resistor and 1.5kΩ pull up resistor to +3.3V. USB Data Signal Minus, incorporating internal series resistor. 3V3OUT USBDM USBDP NC NC CBUS2 14 15 USBDP USBDM I/O I/O Table 3.5 USB Interface Group Pin No. Name Type Description +1.8V to +5.25V supply for the UART Interface and CBUS group pins (2, 3, 6,7,8,9,10 11, 21, 22, 30,31,32). In USB bus powered designs connect this pin 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 to +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. Device ground supply pins. 1 VCCIO PWR 4, 17, 20 GND PWR Copyright © 2010 Future Technology Devices International Limited 10 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Pin No. Name Type Description +3.3V output from integrated LDO regulator. This pin should be decoupled 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. +3.3V to +5.25V supply to the device core. (See Note 1). Device analogue ground supply for internal clock multiplier. 16 3V3OUT Output 19 24 VCC AGND PWR PWR Table 3.6 Power and Ground Group Pin No. 5, 12, 13, 23, 25, 29 18 Name Type Description NC NC No internal connection. Do not connect. 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 operation, otherwise the device will appear to fail. 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 normal operation if internal Oscillator is used. (See Note 2). 26 TEST Input 27 OSCI Input 28 OSCO Output Table 3.7 Miscellaneous Signal Group Pin No. 30 31 32 2 Name TXD DTR# RTS# RXD Type Output Output Output Input Description Transmit Asynchronous Data Output. Data Terminal Ready Control Output / Handshake Signal. Request to Send Control Output / Handshake Signal. Receiving Asynchronous Data Input. Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low (20ms active low pulse) can be used to resume the PC USB host controller from suspend. Data Set Ready Control Input / Handshake Signal. Data Carrier Detect Control Input. Clear To Send Control Input / Handshake Signal. Configurable CBUS output only Pin. Function of this pin is configured in the 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 internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9. 3 RI# Input 6 7 8 DSR# DCD# CTS# Input Input Input 9 CBUS4 I/O 10 CBUS2 I/O Copyright © 2010 Future Technology Devices International Limited 11 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Pin No. Name Type Description Configurable CBUS I/O Pin. Function of this pin is configured in the device 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 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 internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9. 11 CBUS3 I/O 21 CBUS1 I/O 22 CBUS0 I/O 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. 3. When used in Input Mode, the input 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. Copyright © 2010 Future Technology Devices International Limited 12 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 3.5 CBUS Signal Options The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both package versions of the FT232R. These options can be configured in the internal EEPROM using the software utility FT_PPROG or MPROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The default configuration is described in Section 8. CBUS Signal Option TXDEN Available On CBUS Pin Description CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Enable transmit data for RS485 Output is low after the device has been configured by USB, then high during USB suspend mode. This output can be used to control power to external logic P-Channel logic level MOSFET switch. Enable the interface pull-down option when using the PWREN# in this way.* Transmit data LED drive – pulses low when transmitting data via USB. See Section 7.5 for more details. Receive data LED drive – pulses low when receiving data via USB. See Section 7.5 for more details. LED drive – pulses low when transmitting or receiving data via USB. See Section 7.5 for more details. Goes low during USB suspend mode. Typically used to power down an external TTL to RS232 level converter IC in USB to RS232 converter designs. 48MHz Clock output.** 24 MHz Clock output.** 12 MHz Clock output.** 6 MHz Clock output.** CBUS bit bang mode option. Allows up to 4 of the CBUS pins to be used as general purpose I/O. Configured individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the internal EEPROM. A separate application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes in more detail how to use CBUS bit bang mode. Synchronous and asynchronous bit bang mode WR# strobe output. Synchronous and asynchronous bit bang mode RD# strobe output. PWREN# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 TXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 TX&RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 SLEEP# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CLK48 CLK24 CLK12 CLK6 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBitBangI/O CBUS0, CBUS1, CBUS2, CBUS3 BitBangWRn CBUS0, CBUS1, CBUS2, CBUS3 BitBangRDn CBUS0, CBUS1, CBUS2, CBUS3 Table 3.9 CBUS Configuration Control * PWREN# must be used with a 10kΩ resistor pull up. **When in USB suspend mode the outputs clocks are also suspended. Copyright © 2010 Future Technology Devices International Limited 13 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 4 Function Description The FT232R is a USB to serial UART interface device which simplifies USB to serial designs and reduces external component count by fully integrating an external EEPROM, USB termination resistors and an integrated clock circuit which requires no external crystal, into the device. It has been designed to operate efficiently with a USB host controller by using as little as possible of the total USB bandwidth available. 4.1 Key Features Functional Integration. Fully integrated EEPROM, USB termination resistors, clock generation, AVCC filtering, POR and LDO regulator. Configurable CBUS I/O Pin Options. The fully integrated EEPROM allows configuration of the Control Bus (CBUS) functionality, signal inversion and drive strength selection. There are 5 configurable CBUS I/O pins. These configurable options are 1. 2. 3. 4. 5. 6. 7. TXDEN - transmit enable for RS485 designs. PWREN# - Power control for high power, bus powered designs. TXLED# - for pulsing an LED upon transmission of data. RXLED# - for pulsing an LED upon receiving data. TX&RXLED# - which will pulse an LED upon transmission OR reception of data. SLEEP# - indicates that the device going into USB suspend mode. CLK48 / CLK24 / CLK12 / CLK6 - 48MHz, 24MHz, 12MHz, and 6MHz clock output signal options. The CBUS pins can also be individually configured as GPIO pins, similar to asynchronous bit bang mode. It is possible to use this mode while the UART interface is being used, thus providing up to 4 general purpose I/O pins which are available during normal operation. An applicatio n note, AN232R-01, available from FTDI website (www.ftdichip.com) describes this feature. The CBUS lines can be configured with any one of these output options by setting bits in the internal EEPROM. The device is supplied with the most commonly used pin definitions pre -programmed - see Section 8 for details. Asynchronous Bit Bang Mode with RD# and WR# Strobes. The FT232R supports FTDI‟s previous chip generation bit-bang mode. In bit-bang mode, the eight UART lines can be switched from the regular interface mode to an 8-bit general purpose I/O port. Data packets can be sent to the device and they will be sequentially sent to the interface at a rate controlled by an internal timer (equivalent to the baud rate pre-scaler). With the FT232R device this mode has been enhanced by outputting the internal RD# and WR# strobes signals which can be used to allow external logic to be clocked by accesses to the bit -bang I/O bus. This option will be described more fully in a separate application note available from FTDI website (www.ftdichip.com). Synchronous Bit Bang Mode. The FT232R supports synchronous bit bang mode. This mode differs from asynchronous bit bang mode in that the interface pins are only read when the device is written to. This makes it easier for the controlling program to measure the response to an output stimulus as the data returned is synchronous to the output data. An application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes this feature. FTDIChip-ID™. The FT232R also includes the new FTDIChip-ID™ security dongle feature. This FTDIChip-ID™ feature allows a unique number to be burnt into each device during manufacture. This number cannot be reprogrammed. This number is only readable over USB and forms a basis of a security dongle which can be used to protect any customer application software being copied. This allows the possibility of using the FT232R in a dongle for software licensing. Further to this, a renewable license scheme can be implemented based on the FTDIChip-ID™ number when encrypted with other information. This encrypted number can be stored in the user area of the FT232R internal EEPROM, and can be decrypted, then compared with the protected FTDIChip-ID™ to verify that a license is valid. Web based applications can be used to maintain product licensing this way. An application note, AN232R-02, available from FTDI website (www.ftdichip.com) describes this feature. The FT232R is capable of operating at a voltage supply between +3.3V and +5V with a nominal operational mode current of 15mA and a nominal USB suspend mode current of 70µA. This allows greater margin for peripheral designs to meet the USB suspend mode current limit of 2.5mA. An integrated level converter within the UART interface allows the FT232R to interface to UART logic running at +1.8V, 2.5V, +3.3V or +5V. Copyright © 2010 Future Technology Devices International Limited 14 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 4.2 Functional Block Descriptions The following paragraphs detail each function within the FT232R. Please refer to the block diagram shown in Figure 2.1 Internal EEPROM. The internal EEPROM in the FT232R is used to store USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other USB configuration descriptors. The internal EEPROM is also used to configure the CBUS pin functions. The FT232R is supplied with the internal EEPROM pre-programmed as described in Section 8. A user area of the internal EEPROM is available to system designers to allow storing additional data. The internal EEPROM descriptors can be programmed in circuit, over USB without any additional voltage requirement. It can be programmed using the FTDI utility software called MPROG, which can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). +3.3V LDO Regulator. The +3.3V LDO regulator generates the +3.3V reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to th e 3V3OUT regulator output pin. It also provides +3.3V power to the 1.5kΩ internal pull up resistor on USBDP. The main function of the LDO is to power the USB Transceiver and the Reset Generator Cells rather than to power external logic. However, it can be used to supply external circuitry requiring a +3.3V nominal supply with a maximum current of 50mA. USB Transceiver. The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full -speed physical interface to the USB cable. The output drivers provide +3.3V level slew rate control signalling, whilst a differential input receiver and two single ended input receivers provide USB data in, Single -Ended-0 (SE0) and USB reset detection conditions respectfully. This function also incorporates the internal USB series termination resistors on the USB data lines and a 1.5kΩ pull up resistor on USBDP. USB DPLL. The USB DPLL cell locks on to the incoming NRZI USB data and generates recovered clock and data signals for the Serial Interface Engine (SIE) block. Internal 12MHz Oscillator - The Internal 12MHz Oscillator cell generates a 12MHz reference clock. This provides an input to the x4 Clock Multiplier function. The 12MHz Oscillator is also used as the reference clock for the SIE, USB Protocol Engine and UART FIFO controller blocks. Clock Multiplier / Divider. The Clock Multiplier / Divider takes the 12MHz input from the Internal Oscillator function and generates the 48MHz, 24MHz, 12MHz and 6MHz reference clock signals. The 48Mz clock reference is used by the USB DPLL and the Baud Rate Generator blocks. Serial Interface Engine (SIE). The Serial Interface Engine (SIE) block performs the parallel to serial and serial to parallel conversion of the USB data. In accordance with the USB 2.0 specification, it performs bit stuffing/un-stuffing and CRC5/CRC16 generation. It also checks the CRC on the USB data stream. USB Protocol Engine. The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the low level USB protocol requests ge nerated by the USB host controller and the commands for controlling the functional parameters of the UART in accordance with the USB 2.0 specification chapter 9. FIFO RX Buffer (128 bytes). Data sent from the USB host controller to the UART via the USB data OUT endpoint is stored in the FIFO RX (receive) buffer. Data is removed from the buffer to the UART transmit register under control of the UART FIFO controller. (Rx relative to the USB interface). FIFO TX Buffer (256 bytes). Data from the UART receive register is stored in the TX buffer. The USB host controller removes data from the FIFO TX Buffer by sending a USB request for data from the device data IN endpoint. (Tx relative to the USB interface). UART FIFO Controller. The UART FIFO controller handles the transfer of data between the FIFO RX and TX buffers and the UART transmit and receive registers. UART Controller with Programmable Signal Inversion and High Drive. Together with the UART FIFO Controller the UART Controller handles the transfer of data b etween the FIFO RX and FIFO TX buffers and the UART transmit and receive registers. It performs asynchronous 7 or 8 bit parallel to serial and serial to parallel conversion of the data on the RS232 (or RS422 or RS485) interface. Control signals supported by UART mode include RTS, CTS, DSR, DTR, DCD and RI. The UART Controller also provides a transmitter enable control signal pin option (TXDEN) to assist with interfacing to RS485 transceivers. RTS/CTS, DSR/DTR and XON / XOFF handshaking options are also supported. Handshaking is handled in hardware to ensure fast response times. The UART interface also supports the RS232 BREAK setting and detection conditions. Copyright © 2010 Future Technology Devices International Limited 15 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Additionally, the UART signals can each be individually inverted and have a configurable high driv e strength capability. Both these features are configurable in the EEPROM. Baud Rate Generator - The Baud Rate Generator provides a 16x clock input to the UART Controller from the 48MHz reference clock. It consists of a 14 bit pre-scaler and 3 register bits which provide fine tuning of the baud rate (used to divide by a number plus a fraction or “sub -integer”). This determines the baud rate of the UART, which is programmable from 183 baud to 3 Mbaud. The FT232R supports all standard baud rates and non-standard baud rates from 183 Baud up to 3 Mbaud. Achievable non-standard baud rates are calculated as follows Baud Rate = 3000000 / (n + x) where „n‟ can be any integer between 2 and 16,384 ( = 2 ) and „x’ can be a sub-integer of the value 0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, or 0.875. When n = 1, x = 0, i.e. baud rate divisors with values between 1 and 2 are not possible. 14 This gives achievable baud rates in the range 183.1 baud to 3,000,000 baud. When a non -standard baud rate is required simply pass the required baud rate value to the driver as normal, and the FTDI driver will calculate the required divisor, and set the baud rate. See FTDI application note AN232B-05 on the FTDI website (www.ftdichip.com) for more details. RESET Generator - The integrated Reset Generator Cell provides a reliable power-on reset to the device internal circuitry at power up. The RESET# input pin allows an external device to reset the FT232R. RESET# can be tied to VCC or left unconnected if not being used. Copyright © 2010 Future Technology Devices International Limited 16 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings The absolute maximum ratings for the FT232R devices are as follows. These are in accordance with the Absolute Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the device. Parameter Value Unit Storage Temperature Floor Life (Out of Bag) At Factory Ambient (30°C / 60% Relative Humidity) Ambient Temperature (Power Applied) MTTF FT232RL MTTF FT232RQ -65°C to 150°C 168 Hours (IPC/JEDEC J-STD-033A MSL Level 3 Compliant)* -40°C to 85°C 11162037 4464815 Degrees C Hours Degrees C hours hours VCC Supply Voltage DC Input Voltage – USBDP and USBDM DC Input Voltage – High Impedance Bidirectionals DC Input Voltage – All Other Inputs DC Output Current – Outputs DC Output Current – Low Impedance Bidirectionals Power Dissipation (VCC = 5.25V) Table 5.1 Absolute Maximum Ratings -0.5 to +6.00 -0.5 to +3.8 -0.5 to + (VCC +0.5) -0.5 to + (VCC +0.5) 24 24 500 V V V V mA mA mW * If devices are stored out of the packaging beyond this time limit the devices should be baked before use. The devices should be ramped up to a temperature of +125°C and baked for up to 17 hours. Copyright © 2010 Future Technology Devices International Limited 17 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 5.2 DC Characteristics DC Characteristics (Ambient Temperature = -40°C to +85°C) Parameter Description Minimum Typical Maximum Units Conditions VCC1 VCC Operating Supply Voltage VCC Operating Supply Voltage VCCIO Operating Supply Voltage Operating Supply Current Operating Supply Current 3.3v regulator output 4.0 --- 5.25 V Using Internal Oscillator Using External Crystal VCC1 3.3 --- 5.25 V VCC2 1.8 --- 5.25 V Icc1 --- 15 --- mA Normal Operation Icc2 3V3 50 3.0 70 3.3 100 3.6 μA V USB Suspend Table 5.2 Operating Voltage and Current Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 3.2 0.3 1.0 4.1 0.4 1.2 4.9 0.6 1.5 V V V I source = 2mA I sink = 2mA ** VHys 20 25 30 mV ** Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 2.2 0.3 1.0 2.7 0.4 1.2 3.2 0.5 1.5 V V V I source = 1mA I sink = 2mA ** VHys 20 25 30 mV ** Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level) Copyright © 2010 Future Technology Devices International Limited 18 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 2.1 0.3 1.0 2.6 0.4 1.2 2.8 0.5 1.5 V V V I source = 1mA I sink = 2mA ** VHys 20 25 30 mV ** Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 1.32 0.06 1.0 1.62 0.1 1.2 1.8 0.18 1.5 V V V I source = 0.2mA I sink = 0.5mA ** VHys 20 25 30 mV ** Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level) Parameter Voh Vol Description Minimum 3.2 0.3 Typical 4.1 0.4 Maximum 4.9 0.6 Units V V Conditions I source = 6mA I sink = 6mA Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Vin 1.0 1.2 1.5 V ** VHys 20 25 30 mV ** Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 2.2 0.3 1.0 2.8 0.4 1.2 3.2 0.6 1.5 V V V I source = 3mA I sink = 8mA ** VHys 20 25 30 mV ** Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level) Copyright © 2010 Future Technology Devices International Limited 19 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 2.1 0.3 1.0 2.6 0.4 1.2 2.8 0.6 1.5 V V V I source = 3mA I sink = 8mA ** VHys 20 25 30 mV ** Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis 1.35 0.12 1.0 1.67 0.18 1.2 1.8 0.35 1.5 V V V I source = 0.4mA I sink = 3mA ** VHys 20 25 30 mV ** Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ** Only input pins have an internal 200KΩ pull-up resistor to VCCIO Parameter Description Minimum Typical Maximum Units Conditions Vin Input Switching Threshold Input Switching Hysteresis 1.3 1.6 1.9 V VHys 50 55 60 mV Table 5.11 RESET# and TEST Pin Characteristics Copyright © 2010 Future Technology Devices International Limited 20 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions UVoh I/O Pins Static Output (High) 2.8 3.6 V RI = 1.5kΩ to 3V3OUT (D+) RI = 15KΩ to GND (D-) RI = 1.5kΩ to 3V3OUT (D+) RI = 15kΩ to GND (D-) UVol I/O Pins Static Output (Low) Single Ended Rx Threshold Differential Common Mode Differential Input Sensitivity Driver Output Impedance 0 0.3 V UVse 0.8 2.0 V UCom 0.8 2.5 V UVDif 0.2 V UDrvZ 26 29 44 Ohms See Note 1 Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics 5.3 EEPROM Reliability Characteristics The internal 1024 Bit EEPROM has the following reliability characteristics: Parameter Data Retention Read / Write Cycle Value 10 10,000 Unit Years Cycles Table 5.13 EEPROM Characteristics 5.4 Internal Clock Characteristics The internal Clock Oscillator has the following characteristics: Value Parameter Minimum Typical Maximum Unit Frequency of Operation (see Note 1) Clock Period Duty Cycle 11.98 83.19 45 12.00 83.33 50 12.02 83.47 55 MHz ns % Table 5.14 Internal Clock Characteristics Note 1: Equivalent to +/-1667ppm Copyright © 2010 Future Technology Devices International Limited 21 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Vol Vin Output Voltage High Output Voltage Low Input Switching Threshold 2.1 0.3 1.0 2.8 0.4 1.2 3.2 0.6 1.5 V V V I source = 3mA I sink = 8mA Table 5.15 OSCI, OSCO Pin Characteristics – see Note 1 Note1: When supplied, the FT232R is configured to use its internal clock oscillator. These characteristics only apply when an external oscillator or crystal is used. Copyright © 2010 Future Technology Devices International Limited 22 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 6 USB Power Configurations The following sections illustrate possible USB power configurations fo r the FT232R. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ package options. All USB power configurations illustrated apply to both package options for the FT232R device. Please r efer to Section 3 for the package option pin-out and signal descriptions. 6.1 USB Bus Powered Configuration Ferrite Bead Vcc VCC RXD 2 3 4 10nF + 5 SHIELD VCCIO NC RESET# NC OSCI GND Vcc CBUS1 100nF 4.7uF + 3V3OUT A G N D T E S T CBUS2 CBUS3 CBUS4 OSCO RI# CBUS0 DSR# DCD# USBDM RTS# USBDP CTS# TXD 1 FT232R DTR# 100nF G N D G N D G N D GND GND GND Figure 6.1 Bus Powered Configuration Figure 6.1 Illustrates the FT232R in a typical USB bus powered design configuration. A USB bus powered device gets its power from the USB bus. Basic rules for USB bus power devices are as follows – i) ii) iii) iv) v) On plug-in to USB, the device should draw no more current than 100mA. In USB Suspend mode the device should draw no more than 2.5mA. A bus powered high power USB device (one that draws more than 100mA) should use one of the CBUS pins configured as PWREN# and use it to keep the current below 100mA on plug -in and 2.5mA on USB suspend. A device that consumes more than 100mA cannot be plugged into a USB bus powered hub. No device can draw more than 500mA from the USB bus. The power descriptors in the internal EEPROM of the FT232R should be programmed to match the current drawn by the device. A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT232R and associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead depends on the total current drawn by the application. A suitable range of Ferrite Beads is availabl e from Steward (www.steward.com), for example Steward Part # MI0805K400R-10. Note: If using PWREN# (available using the CBUS) the pin should be pulled to VCCIO using a 10kΩ resistor. Copyright © 2010 Future Technology Devices International Limited 23 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 6.2 Self Powered Configuration Figure 6.2 Self Powered Configuration Figure 6.2 illustrates the FT232R in a typical USB self powered configuration. A USB self powered device gets its power from its own power supply, VCC, and does not draw current from the USB bus. The basic rules for USB self powered devices are as follows – i) ii) iii) A self powered device should not force current down the USB bus when the USB host or hub controller is powered down. A self powered device can use as much current as it needs during normal operation and USB suspend as it has its own power supply. A self powered device can be used with any USB host, a bus powered USB hub or a self powered USB hub. The power descriptor in the internal EEPROM of the FT232R should be programmed to a value of zero (self powered). In order to comply with the first requirement above, the USB bus power (pin 1) is used to control the RESET# pin of the FT232R device. When the USB host or hub is powered up an internal 1.5kΩ resistor on USBDP is pulled up to +3.3V (generated using the 4K7 and 10k resistor network), thus identifying the device as a full speed device to the USB host or hub. When the USB host or hub is powered off, RESET# will be low and the FT232R is held in reset. Since RESET# is low, the internal 1.5kΩ resistor is not pulled up to any power supply (hub or host is powered down), so no current flows down USBDP via the 1.5kΩ pull-up resistor. Failure to do this may cause some USB host or hub controllers to power up erratically. Figure 6.2 illustrates a self powered design which has a +4V to +5.25V supply. Note: 1. When the FT232R is in reset, the UART interface I/O pins are tri-stated. Input pins have internal 200kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic. 2. When using internal FT232R oscillator the VCC supply voltage range must be +4.0V to 5.25V. 3. When using external oscillator the VCC supply voltage range must be +3.3V to 5.25V Any design which interfaces to +3.3 V or +1.8V would be having a +3.3V or +1.8V supply to VCCIO. Copyright © 2010 Future Technology Devices International Limited 24 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 6.3 USB Bus Powered with Power Switching Configuration P-Channel Power MOSFET s g d Switched 5V Power To External Logic 0.1uF Soft Start Circuit 1K 0.1uF 1 2 3 Ferrite Bead 5V VCC VCC USBDM TXD RXD RTS# USBDP 4 CTS# 10nF + VCCIO NC RESET# 5 FT232R DTR# DSR# DCD# RI# SHIELD GND NC OSCI CBUS0 OSCO 5V VCC 10K PWREN# 5V VCC 3V3OUT CBUS1 CBUS2 G N D T E S T CBUS3 CBUS4 100nF 4.7uF + 100nF GND GND A G N D G N D G N D GND Figure 6.3 Bus Powered with Power Switching Configuration A requirement of USB bus powered applications, is when in USB suspend mode, the application draws a total current of less than 2.5mA. This requirement includes external logic. Some external logic has the ability to power itself down into a low current state by monitoring the PWREN# signal. For external logic that cannot power itself down in this way, the FT232R provides a simple but effective method of turning off power during the USB suspend mode. Figure 6.3 shows an example of using a discrete P-Channel MOSFET to control the power to external logic. A suitable device to do this is an International Rectifier (www.irf.com) IRLM L6402, or equivalent. It is recommended that a “soft start” circuit consisting of a 1kΩ series resistor and a 0.1μF capacitor is used to limit the current surge when the MOSFET turns on. Without the soft start circuit it is possible that the transient power surge, caused when the MOSFET switches on, will reset the FT232R or the USB host/hub controller. The soft start circuit example shown in Figure 6.3 powers up with a slew rate of approximaely12.5V/ms. Thus supply voltage to external logic transitions from GND to +5V in approximately 400 microseconds. As an alternative to the MOSFET, a dedicated power switch IC with inbuilt “soft -start” can be used. A suitable power switch IC for such an application is the Micrel (www.micrel.com) MIC2025-2BM or equivalent. With power switching controlled designs the following should be noted: i) The external logic to which the power is being switched should have its own reset circuitry to automatically reset the logic when power is re-applied when moving out of suspend mode. ii) Set the Pull-down on Suspend option in the internal FT232R EEPROM. iii) One of the CBUS Pins should be configured as PWREN# in the internal FT232R EEPROM, and used to switch the power supply to the external circuitry. This should be pulled high through a 10 kΩ resistor. iv) For USB high-power bus powered applications (one that consumes greater than 100mA, and up to 500mA of current from the USB bus), the power consumption of the application must be set in the Max Power field in the internal FT232R EEPROM. A high-power bus powered application uses the descriptor in the internal FT232R EEPROM to inform the system of its power requirements. v) PWREN# gets its VCC from VCCIO. For designs using 3V3 logic, ensure VCCIO is not powered down using the external logic. In this case use the +3V3OUT. Copyright © 2010 Future Technology Devices International Limited 25 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 6.4 USB Bus Powered with Selectable External Logic Supply 3.3V or 5V Supply to External Logic 100nF TXD VCC RXD 2 3 4 1 USBDM RTS# USBDP CTS# VCCIO Vcc Ferrite Bead 1 10nF + 5 2 3 VCCIO NC RESET# NC OSCI OSCO Vcc FT232R DTR# DSR# DCD# RI# CBUS0 CBUS1 SHIELD GND Jumper VCCIO 10K 100nF 4.7uF + 100nF 3V3OUT A G N D GND G N D G N D G N D T E S T CBUS2 PWREN# CBUS3 CBUS4 SLEEP# GND GND Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply Figure 6.4 illustrates a USB bus power application with selectable external logic supply. The external logic can be selected between +3.3V and +5V using the jumper switch. This jumper is used to allow t he FT232R to be interfaced with a +3.3V or +5V logic devices. The VCCIO pin is either supplied with +5V from the USB bus (jumper pins1 and 2 connected), or from the +3.3V output from the FT232R 3V3OUT pin (jumper pins 2 and 3 connected). The supply to VCCIO is also used to supply external logic. With bus powered applications, the following should be noted: i) ii) To comply with the 2.5mA current supply limit during USB suspend mode, PWREN# or SLEEP# signals should be used to power down external logic in this mode. If this is not possible, use the configuration shown in Section 6.3. The maximum current sourced from the USB bus during normal operation should not exceed 100mA, otherwise a bus powered design with power switching (Section 6.3) should be used. Another possible configuration could use a discrete low dropout (LDO) regulator which is supplied by the 5V on the USB bus to supply between +1.8V and +2.8V to the VCCIO pin and to the external logic. In this case VCC would be supplied with the +5V from the USB bus and the VCCIO would be supplied from the output of the LDO regulator. This results in the FT232R I/O pins driving out at between +1.8V and +2.8V logic levels. For a USB bus powered application, it is important to consider the following when selecting the regulator: i) ii) The regulator must be capable of sustaining its output voltage with an input voltage of +4.35V. An Low Drop Out (LDO) regulator should be selected. The quiescent current of the regulator must be low enough to meet the total current requirement of +4.0V. This supply is available from the USB VBUS supply = +5.0V. 2. The EEPROM must then be programmed to enable external oscillator. This EEPROM modification cannot be done using the FTDI programming utility, MPROG. The EEPROM can only be re configured from a custom application. Please refer to the following applications note on how to do this: http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_ Osc(FT_000067).pdf 3. The FT232R can then be powered from VCC=+3.3V and an external oscillator. This can be done using a link to switch the VCC supply. The FT232R will fail to operate when the internal oscillator has been disabled, but no external oscillator has been connected. Copyright © 2010 Future Technology Devices International Limited 32 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 8 Internal EEPROM Configuration Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB configuration descriptors stored there. The default factory programmed values of the internal EEPROM are shown in Table 8.1. Parameter Value Notes USB Vendor ID (VID) USB Product UD (PID) Serial Number Enabled? 0403h 6001h Yes FTDI default VID (hex) FTDI default PID (hex) Serial Number See Note A unique serial number is generated and programmed into the EEPROM during device final test. Enabling this option will make the device pull down on the UART interface lines when in USB suspend mode (PWREN# is high). Pull down I/O Pins in USB Suspend Manufacturer Name Product Description Max Bus Power Current Power Source Device Type Disabled FTDI FT232R USB UART 90mA Bus Powered FT232R Returns USB 2.0 device description to the host. USB Version 0200 Note: The device is a USB 2.0 Full Speed device (12Mb/s) as opposed to a USB 2.0 High Speed device (480Mb/s). Taking RI# low will wake up the USB host controller from suspend in approximately 20 ms. Enables the high drive level on the UART and CBUS I/O pins. Makes the device load the VCP driver interface for the device. Default configuration of CBUS0 – Transmit LED drive. Default configuration of CBUS1 – Receive LED drive. Default configuration of CBUS2 – Transmit data enable for RS485 Default configuration of CBUS3 – Power enable. Low after USB enumeration, high during USB suspend mode. Remote Wake Up Enabled High Current I/Os Disabled Load VCP Driver Enabled CBUS0 CBUS1 CBUS2 TXLED# RXLED# TXDEN CBUS3 PWREN# Copyright © 2010 Future Technology Devices International Limited 33 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Parameter Value Notes CBUS4 Invert TXD Invert RXD Invert RTS# Invert CTS# Invert DTR# Invert DSR# Invert DCD# Invert RI# SLEEP# Disabled Disabled Disabled Disabled Disabled Disabled Disabled Disabled Default configuration of CBUS4 – Low during USB suspend mode. Signal on this pin becomes TXD# if enable. Signal on this pin becomes RXD# if enable. Signal on this pin becomes RTS if enable. Signal on this pin becomes CTS if enable. Signal on this pin becomes DTR if enable. Signal on this pin becomes DSR if enable. Signal on this pin becomes DCD if enable. Signal on this pin becomes RI if enable. Table 8.1 Default Internal EEPROM Configuration The internal EEPROM in the FT232R can be programmed over USB using the FTDI util ity program MPROG. MPROG can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). Version 2.8a or later is required for the FT232R chip. Users who do not have their own USB Vendor ID but who would like to use a unique Product ID in their design can apply to FTDI for a free block of unique PIDs. Contact FTDI support for this service. Copyright © 2010 Future Technology Devices International Limited 34 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 9 Package Parameters The FT232R is available in two different packages. The FT232RL is the SSOP-28 option and the FT232RQ is the QFN-32 package option. The solder reflow profile for both packages is described in Section 9.5. 9.1 SSOP-28 Package Dimensions 7.80 +/-0.40 5.30 +/-0.30 1.75 +/- 0.10 1.02 Typ. 0.05 Min 0.30 +/-0.012 2.00 Max 1 28 YYXX-A XXXXXXXXXXXX FT232RL 14 12° Typ 1.25 +/-0.12 10.20 +/-0.30 0.09 FTDI 0.25 0° - 8° 0.75 +/-0.20 0.65 +/-0.026 15 Figure 9.1 SSOP-28 Package Dimensions The FT232RL is supplied in a RoHS compliant 28 pin SSOP package. The package is lead (Pb) free and uses a „green‟ compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 5.30mm x 10.20mm body (7.80mm x 10.20mm including pins). The pins are on a 0.65 mm pitch. The above mechanical drawing shows the SSOP-28 package. All dimensions are in millimetres. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. This is followed by the revision number. The code XXXXXXXXXXXX is the manufacturing LOT code. This only applies to devices manufactured after April 2009. Copyright © 2010 Future Technology Devices International Limited 35 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 9.2 QFN-32 Package Dimensions 32 25 1 Indicates Pin #1 (Laser Marked) YYXX-A XXXXXXX 8 FT232RQ 9 16 17 5.000 +/-0.075 Central Heat Sink Area 0.500 8 7 6 5 9 10 11 12 13 14 15 16 0.150 Max 17 18 19 20 21 22 23 24 0.250 +/-0.050 4 3 2 1 3.200 +/-0.100 5.000 +/-0.075 FTDI 24 0.200 Min Pin #1 ID 32 31 30 29 28 27 26 25 3.200 +/-0.100 0.500 +/-0.050 0.900 +/ -0.100 0.200 0.050 Note: The pin #1 ID is connected internally to the device’s central heat sink area . It is recommended to ground the central heat sink area of the device. Dimensions in mm. Figure 9.2 QFN-32 Package Dimensions The FT232RQ is supplied in a RoHS compliant leadless QFN-32 package. The package is lead ( Pb ) free, and uses a „green‟ compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 5.00mm x 5.00mm. The solder pads are on a 0.50mm pitch. The above mechanical drawing shows the QFN-32 package. All dimensions are in millimetres. The centre pad on the base of the FT232RQ is not internally connected, and can be left unconnected, or connected to ground (recommended). The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. The code XXXXXXX is the manufacturing LOT code. This only applies to devices manufactured after April 2009. Copyright © 2010 Future Technology Devices International Limited 36 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 9.3 QFN-32 Package Typical Pad Layout 2.50 25 0.150 Max 1 0.500 Optional GND Connection 0.30 3.200 +/-0.100 3.200 +/-0.100 Optional GND Connection 0.20 2.50 17 0.200 Min 0.100 9 0.500 +/-0.050 Figure 9.3 Typical Pad Layout for QFN-32 Package 9.4 QFN-32 Package Typical Solder Paste Diagram 2.5 +/- 0.0375 2.5 +/- 0.0375 Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package Copyright © 2010 Future Technology Devices International Limited 37 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 9.5 Solder Reflow Profile The FT232R is supplied in Pb free 28 LD SSOP and QFN-32 packages. The recommended solder reflow profile for both package options is shown in Figure 9.5. tp Temperature, T (Degrees C) Tp Ramp Up TL tL TS Max Critical Zone: when T is in the range TL to Tp Ramp Down T Min S tS Preheat 25 T = 25º C to TP Time, t (seconds) Figure 9.5 FT232R Solder Reflow Profile The recommended values for the solder reflow profile are detailed in Table 9.1. Values are shown for both a completely Pb free solder process (i.e. the FT232R is used with Pb free solder), and for a non-Pb free solder process (i.e. the FT232R is used with non-Pb free solder). Profile Feature Average Ramp Up Rate (Ts to Tp) Pb Free Solder Process 3°C / second Max. Non-Pb Free Solder Process 3°C / Second Max. Preheat - Temperature Min (Ts Min.) - Temperature Max (Ts Max.) - Time (ts Min to ts Max) 150°C 200°C 60 to 120 seconds 100°C 150°C 60 to 120 seconds Time Maintained Above Critical Temperature TL: - Temperature (TL) - Time (tL) Peak Temperature (Tp) Time within 5°C of actual Peak Temperature (tp) Ramp Down Rate Time for T= 25°C to Peak Temperature, Tp Table 9.1 Reflow Profile Parameter Values 217°C 60 to 150 seconds 183°C 60 to 150 seconds 260°C 240°C 20 to 40 seconds 20 to 40 seconds 6°C / second Max. 8 minutes Max. 6°C / second Max. 6 minutes Max. Copyright © 2010 Future Technology Devices International Limited 38 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 10 Contact Information Head Office – Glasgow, UK Future Technology Devices International Limited Unit 1, 2 Seaward Place Centurion Business Park Glasgow, G41 1HH United Kingdom Tel: +44 (0) 141 429 2777 Fax: +44 (0) 141 429 2758 E-mail (Sales) sales1@ftdichip.com E-mail (Support) support1@ftdichip.com E-mail (General Enquiries) admin1@ftdichip.com Web Site URL http://www.ftdichip.com Web Shop URL http://www.ftdichip.com Branch Office – Taipei, Taiwan Future Technology Devices International Limited (Taiwan) 2F, No 516, Sec. 1 NeiHu Road Taipei 114 Taiwan, R.O.C. Tel: +886 (0) 2 8791 3570 Fax: +886 (0) 2 8791 3576 E-mail (Sales) tw.sales1@ftdichip.com E-mail (Support) tw.support1@ftdichip.com E-mail (General Enquiries) tw.admin1@ftdichip.com Web Site URL http://www.ftdichip.com Branch Office – Hillsboro, Oregon, USA Future Technology Devices International Limited (USA) 7235 NW Evergreen Parkway, Suite 600 Hillsboro, OR 97123-5803 USA Tel: +1 (503) 547 0988 Fax: +1 (503) 547 0987 E-Mail (Sales) E-Mail (Support) Web Site URL us.sales@ftdichip.com us.admin@ftdichip.com http://www.ftdichip.com Branch Office – Shanghai, China Future Technology Devices International Limited (China) Room 408, 317 Xianxia Road, ChangNing District, ShangHai, China Tel: +86 (21) 62351596 Fax: +86(21) 62351595 E-Mail (Sales): cn.sales@ftdichip.com E-Mail (Support): cn.support@ftdichip.com E-Mail (General Enquiries): cn.admin1@ftdichip.com Web Site URL: http://www.ftdichip.com Distributor and Sales Representatives Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales representative(s) in your country. Copyright © 2010 Future Technology Devices International Limited 39 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Appendix A – References Useful Application Notes http://www.ftdichip.com/Documents/AppNotes/AN232R-01_FT232RBitBangModes.pdf http://www.ftdichip.com/Documents/AppNotes/AN_107_AdvancedDriverOptions_AN_000073.pdf http://www.ftdichip.com/Documents/AppNotes/AN232R-02_FT232RChipID.pdf http://www.ftdichip.com/Documents/AppNotes/AN_121_FTDI_Device_EEPROM_Us er_Area_Usage.pdf http://www.ftdichip.com/Documents/AppNotes/AN_120_Aliasing_VCP_Baud_Rates.pdf http://www.ftdichip.com/Documents/AppNotes/AN_100_Using_The_FT232_245R_With_External_Osc(FT_ 000067).pdf http://www.ftdichip.com/Resources/Utilities/AN_126_User_Guide_For_FT232_Factory%20test%20utility. pdf http://www.ftdichip.com/Documents/AppNotes/AN232B-05_BaudRates.pdf http://www.ftdichip.com/Documents/InstallGuides.htm Copyright © 2010 Future Technology Devices International Limited 40 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Appendix B - List of Figures and Tables List of Figures Figure 2.1 FT232R Block Diagram ................................................................................................... 4 Figure 3.1 SSOP Package Pin Out and Schematic Symbol .......................................................... 7 Figure 3.2 QFN-32 Package Pin Out and schematic symbol .............................................................. 10 Figure 6.1 Bus Powered Configuration ........................................................................................... 23 Figure 6.2 Self Powered Configuration ........................................................................................... 24 Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply .................................... 26 Figure 7.1 Application Example showing USB to RS232 Converter ..................................................... 27 Figure 7.2 Application Example Showing USB to RS485 Converter .................................................... 28 Figure 7.3 USB to RS422 Converter Configuration........................................................................... 29 Figure 7.4 USB to MCU UART Interface .......................................................................................... 30 Figure 7.5 Dual LED Configuration ................................................................................................ 31 Figure 7.6 Single LED Configuration .............................................................................................. 31 Figure 9.1 SSOP-28 Package Dimensions ....................................................................................... 35 Figure 9.2 QFN-32 Package Dimensions ......................................................................................... 36 Figure 9.3 Typical Pad Layout for QFN-32 Package .......................................................................... 37 Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package ........................................................... 37 Figure 9.5 FT232R Solder Reflow Profile ........................................................................................ 38 List of Tables Table 3.1 USB Interface Group ....................................................................................................... 7 Table 3.2 Power and Ground Group ................................................................................................. 8 Table 3.3 Miscellaneous Signal Group .............................................................................................. 8 Table 3.4 UART Interface and CUSB Group (see note 3) .................................................................... 9 Table 3.5 USB Interface Group ..................................................................................................... 10 Table 3.6 Power and Ground Group ............................................................................................... 11 Table 3.7 Miscellaneous Signal Group ............................................................................................ 11 Table 3.8 UART Interface and CBUS Group (see note 3) .................................................................. 12 Table 3.9 CBUS Configuration Control ........................................................................................... 13 Table 5.1 Absolute Maximum Ratings ............................................................................................ 17 Table 5.2 Operating Voltage and Current ....................................................................................... 18 Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level) .................. 18 Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level) .................. 18 Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level) .................. 19 Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level) .................. 19 Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level) ......................... 19 Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level) ......................... 19 Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level) ......................... 20 Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ....................... 20 Copyright © 2010 Future Technology Devices International Limited 41 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Table 5.11 RESET# and TEST Pin Characteristics ............................................................................ 20 Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics ................................................................. 21 Table 5.13 EEPROM Characteristics ............................................................................................... 21 Table 5.14 Internal Clock Characteristics ....................................................................................... 21 Table 5.15 OSCI, OSCO Pin Characteristics – see Note 1 ................................................................. 22 Table 8.1 Default Internal EEPROM Configuration............................................................................ 34 Table 9.1 Reflow Profile Parameter Values ..................................................................................... 38 Copyright © 2010 Future Technology Devices International Limited 42 Document No.: FT_000053 FT232R USB UART IC Datasheet Version 2.07 Clearance No.: FTDI# 38 Appendix C - Revision History Version 0.90 Version 0.96 Version 1.00 Version 1.02 Version 1.03 Version 1.04 Version 2.00 Initial Datasheet Created Revised Pre-release datasheet Full datasheet released Minor revisions to datasheet Manufacturer ID added to default EEPROM configuration; Buffer sizes added QFN-32 Pad layout and solder paste diagrams added Reformatted, updated package info, added notes for 3.3V operation; Part numbers, TID; added UART and CBUS characteristics for +1.8V; Corrected RESET#; Added MTTF data; Corrected the input switching threshold and input hysteresis values for VCCIO=5V Version 2.01 Corrected pin-out number in table3.2 for GND pin18. Improved graphics on some Figures. Add packing details. Changed USB suspend current spec from 500uA to 2.5mA Corrected Figure 9.2 QFN dimensions. Version 2.02 Corrected Tape and Reel quantities. Added comment “PWREN# should be used with a 10kΩ resistor pull up”. Replaced TXDEN# with TXDEN since it is active high in various places. Added lot number to the device markings. Added 3V3 regulator output tolerance. Clarified VCC operation and added section headed “Using an external Oscillator” Updated company contact information. Version 2.03 Version 2.04 Version 2.05 Corrected the RX/TX buffer definitions to be relative to the USB interface Additional dimensions added to QFN solder profile Modified package dimensions to 5.0 x 5.0 +/-0.075mm. and Solder paste diagram to 2.50 x 2.50 +/-0.0375mm Added Windows 7 32, 64 bit driver support Added FT_PROG utility references Added Appendix A-references April 2009 June 2009 June 2009 December 2009 August 2008 August 2005 October 2005 December 2005 December 2005 January 2006 January 2006 June 2008 Figure 2.1 updated Updated USB-IF TID for Rev B Version 2.06 Updated section 6.2, Figure 6.2 and the note, Updated section 5.3, Table 5.13, EEPROM data retention time May 2010 Version 2.07 Added USB Certification Logos July 2010 Copyright © 2010 Future Technology Devices International Limited 43