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| TM Future Technology Devices International Ltd. EVAL232R FT232RL USB to RS232 Evaluation Module Incorporating Clock Generator Output and FTDIChip-IDTM Security Dongle The EVAL232R is a USB to RS232 evaluation module for FTDI's FT232RL USB - Serial UART interface IC device, the latest device to be added to FTDI's range of USB UART interface Integrated Circuit Devices. The FT232RL is a USB to serial UART interface with optional clock generator output, and the new FTDIChip-IDTM security dongle feature. In addition, asynchronous and synchronous bit bang interface modes are available. USB to serial interface designs using the FT232RL have been further simplified by fully integrating the external EEPROM, clock circuit and USB resistors onto the device. The FT232RL adds two new functions compared with its predecessors, effectively making it a "3-in-1" chip for some application areas. The internally generated clock (6MHz, 12MHz, 24MHz, and 48MHz) can be brought out of the device and used to drive a microcontroller or external logic. A unique number (the FTDIChip-IDTM) is burnt into the device during manufacture and is readable over USB, thus forming the basis of a security dongle which can be used to protect customer application software from being copied. The EVAL232R is supplied on a 61.0mm x 32.0mm (2.40" x 1.26") PCB. All components used, including the FT232RL and RS232 level converter IC are Pb-free (RoHS compliant). Copyright (c) Future Technology Devices International Ltd. 2005 1. Features 1.1 Hardware Features * * * * * * * * * * * * * * * * * FT232RL provides single chip USB to asynchronous serial data transfer interface. Module provides USB to RS232 interface, with additional I/O pinout. Entire USB protocol handled on the FT232RL chip - No USB-specific firmware programming required. UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity. Fully assisted hardware or X-On / X-Off software handshaking. Data transfer rates from 300 baud to 1 Megabaud at RS232 levels. FTDI's royalty-free VCP and D2XX drivers eliminate the requirement for USB driver development in most cases. In-built support for event characters and line break condition. New USB FTDIChip-IDTM feature. New configurable CBUS I/O pins. Transmit and receive LED's to indicate serial data transfer. New 48MHz, 24MHz,12MHz, and 6MHz clock output signal Options. FIFO receive and transmit buffers for high data throughput. Adjustable receive buffer timeout. Synchronous and asynchronous bit bang mode interface options with RD# and WR# strobes. New CBUS bit bang mode option. Integrated 1024 bit internal EEPROM for storing USB VID, PID, serial number and product description strings, and CBUS I/O configuration. * * * * * * * * * * * * * * * * * * * * * Page 2 Device supplied preprogrammed with unique USB serial number. Support for USB suspend and resume. Module supply voltage comes from VCC - no external supply required. 5V USB power available to supply external devices. Integrated 3.3V level converter for USB I/O . Integrated level converter on UART and CBUS for interfacing to 5V - 1.8V Logic. On board jumper allows for selection of UART and CBUS interface IO voltage. True 5V / 3.3V / 2.8V / 1.8V CMOS drive output and TTL input. High I/O pin output drive option. Integrated USB resistors. Integrated power-on-reset circuit. Fully integrated clock - no external crystal, oscillator, or resonator required. Fully integrated AVCC supply filtering - No separate AVCC pin and no external R-C filter required. USB bulk transfer mode. Low operating and USB suspend current. Low USB bandwidth consumption. UHCI / OHCI / EHCI host controller compatible USB 2.0 Full Speed compatible. -40C to 85C extended operating temperature range. Supplied on minature 61.0mm x 32.0mm (2.40" x 1.26") PCB with 15 board header pins. Connect to a PC via a standard USB A to B USB cable. Royalty-Free VIRTUAL COM PORT (VCP) DRIVERS for... * Windows 98, 98SE, ME, 2000, Server 2003, XP. * Windows Vista / Longhorn* * Windows XP 64-bit.* * Windows XP Embedded. * Windows CE.NET 4.2 & 5.0 * MAC OS 8 / 9, OS-X * Linux 2.4 and greater 1.2 Driver Support Royalty-Free D2XX Direct Drivers (USB Drivers + DLL S/W Interface) * Windows 98, 98SE, ME, 2000, Server 2003, XP. * Windows Vista / Longhorn* * Windows XP 64-bit.* * Windows XP Embedded. * Windows CE.NET 4.2 & 5.0 * Linux 2.4 and greater The drivers listed above are all available to download for free from the FTDI website. Various 3rd Party Drivers are also available for various other operating systems - see the FTDI website for details. * Currently Under Development. Contact FTDI for availability. * * * * * * * * USB to RS232 Converter Upgrading Legacy Peripherals 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 1.3 Typical Applications * * * * * * * USB FLASH Card Reader / Writers Set Top Box PC - USB interface USB Digital Camera Interface USB Hardware Modems USB Wireless Modems USB Bar Code Readers USB Software / Hardware Encryption Dongles EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 2. Features and Enhancements 2.1 Key Features Page 3 This section summarises the key features and enhancements of the FT232RL IC device which is used on the EVAL232R Module. For further details, consult the FT232R datasheet, which is available from the FTDI website. Integrated Clock Circuit - Previous generations of FTDI's USB UART devices required an external crystal or ceramic resonator. The clock circuit has now been integrated onto the device meaning that no crystal or ceramic resonator is required. However, if required, an external 12MHz crystal can be used as the clock source. Integrated EEPROM - Previous generations of FTDI's USB UART devices required an external EEPROM if the device were to use USB Vendor ID (VID), Product ID (PID), serial number and product description strings other than the default values in the device itself. This external EEPROM has now been integrated onto the FT232R chip meaning that all designs have the option to change the product description strings. A user area of the internal EEPROM is available for storing additional data. The internal EEPROM is programmable in circuit, over USB without any additional voltage requirement. Preprogrammed EEPROM - The FT232R is supplied with its internal EEPROM preprogrammed with a serial number which is unique to each individual device. This, in most cases, will remove the need to program the device EEPROM. Integrated USB Resistors - Previous generations of FTDI's USB UART devices required two external series resistors on the USBDP and USBDM lines, and a 1.5 k pull up resistor on USBDP. These three resistors have now been integrated onto the device. Integrated AVCC Filtering - Previous generations of FTDI's USB UART devices had a separate AVCC pin - the supply to the internal PLL. This pin required an external R-C filter. The separate AVCC pin is now connected internally to VCC, and the filter has now been integrated onto the chip. Less External Components - Integration of the crystal, EEPROM, USB resistors, and AVCC filter will substantially reduce the bill of materials cost for USB interface designs using the FT232R compared to its FT232BM predecessor. Configurable CBUS I/O Pin Options - There are now 5 configurable Control Bus (CBUS) lines. Options are 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. There is also the option to bring out bit bang mode read and write strobes (see below). 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 preprogrammed - see Section 8 for details. Enhanced Asynchronous Bit Bang Mode with RD# and WR# Strobes - The FT232R supports FTDI's BM chip 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 prescaler). With the FT232R device this mode has been enhanced so that the internal RD# and WR# strobes are now brought out of the device 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. Synchronous Bit Bang Mode - Synchronous bit bang mode differs from asynchronous bit bang mode in that the interface pins are only read when the device is written to. Thus making it easier for the controlling program to measure the response to an output stimulus as the data returned is synchronous to the output data. The feature was previously seen in FTDI's FT2232C device. This option will be described more fully in a separate application note. CBUS Bit Bang Mode - This mode allows four of the CBUS pins to 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 four general purpose I/O pins which are available during normal operation. An application note describing this feature is available separately from the FTDI website. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 Page 4 Lower Supply Voltage - Previous generations of the chip required 5V supply on the VCC pin. The FT232R will work with a Vcc supply in the range 3.3V - 5.25V. Bus powered designs would still take their supply from the 5V on the USB bus, but for self powered designs where only 3.3V is available and there is no 5V supply there is no longer any need for an additional external regulator. Integrated Level Converter on UART Interface and Control Signals - VCCIO pin supply can be from 1.8V to 5V. Connecting the VCCIO pin to 1.8V, 2.8V, or 3.3V allows the device to directly interface to 1.8V, 2.8V or 3.3V and other logic families without the need for external level converter I.C. devices. 5V / 3.3V / 2.8V / 1.8V Logic Interface - The FT232R provides true CMOS Drive Outputs and TTL level Inputs. Integrated Power-On-Reset (POR) Circuit- The device incorporates an internal POR function. A RESET# pin is available in order to allow external logic to reset the FT232R where required. However, for many applications the RESET# pin can be left unconnected, or pulled up to VCCIO. Lower Operating and Suspend Current - The device operating supply current has been further reduced to 15mA, and the suspend current has been reduced to around 70A. This allows greater margin for peripheral designs to meet the USB suspend current limit of 500A. Low USB Bandwidth Consumption - The operation of the USB interface to the FT232R has been designed to use as little as possible of the total USB bandwidth available from the USB host controller. High Output Drive Option - The UART interface and CBUS I/O pins can be made to drive out at three times the standard signal drive level thus allowing multiple devices to be driven, or devices that require a greater signal drive strength to be interfaced to the FT232R. This option is enabled in the internal EEPROM. Power Management Control for USB Bus Powered, High Current Designs- The PWREN# signal can be used to directly drive a transistor or P-Channel MOSFET in applications where power switching of external circuitry is required. An option in the internal EEPROM makes the device gently pull down on its UART interface lines when the power is shut off (PWREN# is high). In this mode any residual voltage on external circuitry is bled to GND when power is removed, thus ensuring that external circuitry controlled by PWREN# resets reliably when power is restored. UART Pin Signal Inversion - The sense of each of the eight UART signals can be individually inverted by setting options in the internal EEPROM. Thus, CTS# (active low) can be changed to CTS (active high), or TXD can be changed to TXD#. FTDIChip-IDTM - Each FT232R is assigned a unique number which is burnt into the device at manufacture. This ID number cannot be reprogrammed by product manufacturers or end-users. This allows the possibility of using FT232R based dongles for software licensing. Further to this, a renewable license scheme can be implemented based on the FTDIChip-IDTM 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-IDTM to verify that a license is valid. Web based applications can be used to maintain product licensing this way. An application note describing this feature is available separately from the FTDI website. Improved EMI Performance - The reduced operating current and improved on-chip VCC decoupling significantly improves the ease of PCB design requirements in order to meet FCC, CE and other EMI related specifications. Programmable Receive Buffer Timeout - The receive buffer timeout is used to flush remaining data from the receive buffer. This time defaults to 16ms, but is programmable over USB in 1ms increments from 1ms to 255ms, thus allowing the device to be optimised for protocols that require fast response times from short data packets. Baud Rates - The FT232R supports all standard baud rates and non-standard baud rates from 300 Baud up to 3 Megabaud. 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 ( = 214 ) 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. 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 for more details. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 Page 5 Extended Operating Temperature Range - The FT232R operates over an extended temperature range of -40 to +85 C thus allowing the device to be used in automotive and industrial applications. New Package Options - The FT232R is available in two packages - a compact 28 pin SSOP ( FT232RL) and an ultra-compact 5mm x 5mm pinless QFN-32 package ( FT232RQ). Both packages are lead ( Pb ) free, and use a `green' compound. Both packages are fully compliant with European Union directive 2002/95/EC. The MM232R module uses a FT232RQ device in its design. Figure 1 - The EVAL232R Development Module. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 3. EVAL232R Pin Out and Signal Descriptions 3.1 EVAL232R Pin Out GND RESET# VCCIO CBUS3 CBUS2 CBUS1 CBUS0 VCC 1 2 3 4 5 6 7 8 Page 6 LP1 LP2 TX LED RX LED 1 3 2 4 J2 J3 1 FTDI 2 3 J1 VCC30 VCCIO VCC Figure 2 - EVAL232R Module Pin Out. DCD 1 RXD 2 TXD 3 DTR 4 GND 5 DSR 6 RTS 7 CTS 8 RI 9 Figure 3 - EVAL232R RS232 (DB9) Pin Out EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 3.2 Header Pin and Jumper Signal Descriptions Table 1 - Module Pin Out Description - Jumper J1 Pin No. Name 1 VCC Page 7 Type Output Description 5V Power output USB port. For a low power USB bus powered design, up to 100mA can be sourced from the 5V supply on the USB bus. A maximum of 500mA can be sourced from the USB bus in a high power USB bus powered design. +1.8V to +5.25V supply to the FT232RL's UART Interface and CBUS I/O pins. In USB bus powered designs connect to 3V3 to drive out at 3.3V levels (connect VCCIO to VCC3O), or connect to VCC to drive out at 5V CMOS level (connect VCCIO to VCC). 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 (like the EVAL232R for example) a regulator which is supplied by the 5V on the USB bus should be used. 3.3V output from FT232RL's integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb with 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 1.5k 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 FT232RL's VCCIO pin by connecting this pin to pin 3 (VCCIO). 2 VCCIO Input 3 VCC3O Output Table 2 - Module Pin Out Description - 8 Pin Header J2 Pin No. Name 1 VCC Type Output Description 5V Power output USB port. For a low power USB bus powered design, up to 100mA can be sourced from the 5V supply on the USB bus. A maximum of 500mA can be sourced from the USB bus in a high power USB bus powered design. Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is RXLED#. See CBUS Signal Options, Table 4.* Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is TXLED#. See CBUS Signal Options, Table 4.* Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is PWREN#. See CBUS Signal Options, Table 4.* Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is PWREN#. See CBUS Signal Options, Table 4.* 3.3V output from FT232RL's integrated L.D.O. regulator. This pin is decoupled to ground on the module pcb with 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 1.5k pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if required. Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCCIO. Module ground supply pins 2 3 4 5 6 CBUS0 CBUS1 CBUS2 CBUS3 VCC3O Input Output Output Output Output 7 3 RESET# GND Input GND Table 3 - Module Pin Out Description - Jumper J3 Pin No. Name 1 CBUS0 Type Output Description Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is RXLED#. See CBUS Signal Options, Table 4.* Connect to LP1 to drive the red receive data LED (module default) Red receive data LED Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default pin function for the EVAL232R module is TXLED#. See CBUS Signal Options, Table 4.* Connect to LP2 to drive the green transmit data LED (module default) Green transmit data LED 2 3 LP1 CBUS1 Input Output 3 LP2 Intput * When used in Input Mode, these pins are pulled to VCCIO via internal 200k resistors. These pins can be programmed to gently pull low during USB suspend ( PWREN# = "1" ) by setting an option in the internal EEPROM. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 3.3 CBUS Signal Options Page 8 The following options can be configured on the CBUS I/O pins. These options are all configured in the internal EEPROM using the utility software MPROG, which can be downloaded from the FTDI website. The default configuration is described in Section 8. Table 4 - CBUS Signal Options CBUS Signal Option Available On CBUS Pin... TXDEN TXLED# RXLED# TX&RXLED# PWREN# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Description Enable transmit data for RS485 Transmit data LED drive - pulses low when transmitting data via USB. See FT232R datasheet for more details. Receive data LED drive - pulses low when receiving data via USB. See FT232R datasheet for more details. LED drive - pulses low when transmitting or receiving data via USB. See FT232R datasheet for more details. Goes low after the device is configured by USB, then high during USB suspend. Can be used to control power to external logic PChannel logic level MOSFET switch. Enable the interface pull-down option when using the PWREN# pin in this way. Goes low during USB suspend mode. Typically used to power down an external TTL to RS232 level converter I.C. in USB to RS232 converter designs. 48MHz Clock output. 24MHz Clock output. 12MHz Clock output. 6MHz 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 will describe 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 SLEEP# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CLK48 CLK24 CLK12 CLK6 CBitBangI/O CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 CBUS0, CBUS1, CBUS2, CBUS3 BitBangWRn BitBangRDn CBUS0, CBUS1, CBUS2, CBUS3 CBUS0, CBUS1, CBUS2, CBUS3 3.4 RS232 Signal Descriptions Table 5 - RS232 Signals DB9 pin No. Name 1 2 3 4 5 6 7 8 9 DCD RXDATA TXDATA DTR GND DSR RTS CTS RI Type Input Input Output Output GND Input Output Input Input Description Data Carrier Detect control input Receive Asynchronous Data input. Transmit Asynchronous Data output. Data Terminal Ready control output / Handshake signal Device groud supply pin. Data Set Ready control input / Handshake signal Request To Send Control Output / Handshake signal. Clear to Send Control input / Handshake signal. Ring Indicator control input. When remote wakeup is enabled in the FT232RL's internal EEPROM taking RI# low can be used to resume the PC USB host controller from suspend. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 4. Module Dimensions Page 9 61.50mm (2.46") 2.75mm (0.11") 12.50mm (0.50") 3.25mm (0.13") LP1 LP2 J3 J2 4.70mm (0.19") FTDI 12.00mm (0.48") 18.00mm (0.72") 32.00mm (1.28") J1 O 2.50mm (0.10") 3.25mm (0.13") 7.00mm (0.28") 5.50mm (0.22") 2.55mm (0.10") 0.65mm (0.03") 1.90mm (0.08") 11.80mm (0.47") 12.5mm (0.50") 9.30mm (0.37") 1.60mm (0.06") 14.35mm (0.57") 4.95mm (0.20") 20.00mm (0.80") 61.00mm (2.44") Figure 4 - EVAL232R Module Dimensions All dimensions are stated in millimeters, with inches in parenthesis. The FT232RL is supplied in a RoHS compliant 28 pinSSOP package. The package is lead ( Pb ) free and uses a `green' compound. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. The EVAL232R module uses exclusivly lead free components. Both the I.C. device and the module are fully compliant with European Union directive 2002/95/EC. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 5. Device Characteristics and Ratings 5.1 Absolute Maximum Ratings Page 10 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. Table 6 - Absolute Maximum Ratings Parameter Storage Temperature Floor Life (Out of Bag) At Factory Ambient ( 30C / 60% Relative Humidity) Ambient Temperature (Power Applied) Vcc Supply Voltage D.C. Input Voltage - USBDP and USBDM D.C. Input Voltage - High Impedance Bidirectionals D.C. Input Voltage - All other Inputs D.C. Output Current - Outputs DC Output Current - Low Impedance Bidirectionals Power Dissipation (Vcc = 5.25V) Value -65C to 150C 168 Hours (IPC/JEDEC J-STD-033A MSL Level 3 Compliant)* -40C to 85C -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 Unit Degrees C Hours Degrees C. 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 125C and baked for up to 17 hours. 5.2 DC Characteristics DC Characteristics ( Ambient Temperature = -40 to 85oC ) Table 7 - Operating Voltage and Current Parameter Vcc1 Vcc2 Icc1 Icc2 Description VCC Operating Supply Voltage VCCIO Operating Supply Voltage Operating Supply Current Operating Supply Current Min 3.3 1.8 50 Typ 15 70 Max 5.25 5.25 100 Units V V mA Conditions Normal Operation USB Suspend* A Table 8 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, Standard Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 3.2 0.3 1.3 50 Typ 4.1 0.4 1.6 55 Max 4.9 0.6 1.9 60 Units V V V mV Conditions I source = 2mA I sink = 2mA ** ** Table 9 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, Standard Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 2.2 0.3 1.0 20 Typ 2.7 0.4 1.2 25 Max 3.2 0.5 1.5 30 Units V V V mV Conditions I source = 1mA I sink = 2mA ** ** EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 Page 11 Table 10 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, Standard Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 2.1 0.3 1.0 20 Typ 2.6 0.4 1.2 25 Max 3.1 0.5 1.5 30 Units V V V mV Conditions I source = 1mA I sink = 2mA ** ** Table 11 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, High Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 3.2 0.3 1.3 50 Typ 4.1 0.4 1.6 55 Max 4.9 0.6 1.9 60 Units V V V mV Conditions I source = 6mA I sink = 6mA ** ** Table 12 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, High Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 2.2 0.3 1.0 20 Typ 2.8 0.4 1.2 25 Max 3.2 0.6 1.5 30 Units V V V mV Conditions I source = 3mA I sink = 8mA ** ** Table 13 - FT232R UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, High Drive Level) Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 2.1 0.3 1.0 20 Typ 2.8 0.4 1.2 25 Max 3.2 0.6 1.5 30 Units V V V mV Conditions I source = 3mA I sink = 8mA ** ** **Inputs have an internal 200k pull-up resistor to VCCIO. Table 14 - FT232R RESET# and TEST Pin Characteristics Parameter Vin VHys Description Input Switching Threshold Input Switching Hysteresis Min 1.3 50 Typ 1.6 55 Max 1.9 60 Units V mV Conditions Table 15 - FT232R USB I/O Pin (USBDP, USBDM) Characteristics Parameter UVoh UVol UVse UCom UVDif UDrvZ Description I/O Pins Static Output ( High) I/O Pins Static Output ( Low ) Single Ended Rx Threshold Differential Common Mode Differential Input Sensitivity Driver Output Impedance Min 2.8 0 0.8 0.8 0.2 26 Typ Max 3.6 0.3 2.0 2.5 Units V V V V V Conditions RI = 1.5k to 3V3Out ( D+ ) RI = 15k to GND ( D- ) RI = 1.5k to 3V3Out ( D+ ) RI = 15k to GND ( D- ) 29 44 Ohms *** ***Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM pins. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 5.3 EEPROM Reliability Characteristics The FT232R's internal 1024 bit EEPROM has the following reliability characteristicsTable 16 - EEPROM Characteristics Parameter Description Data Retention Read / Write Cycles Page 12 Value 15 100,000 Unit Years Cycles 5.4 Internal Clock Characteristics The FT232R's internal Clock Oscillator has the following characteristics. Table 17 - Internal Clock Characteristics Parameter Min Frequency of Operation Clock Period Duty Cycle 11.98 83.19 45 Value Typical 12.00 83.33 50 Unit Max 12.02 83.47 55 MHz ns % EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 6. Module Configurations 6.1 Bus Powered Configuration Page 13 The EVAL232R module is designed to be powered from the 5V supply available on the USB bus powered. VCCIO, the supply to the FT232RL's UART and CBUS IO pins, can be connected to VCC or VCC3O, depending on wheather 5V or 3.3V output levels are required on the CBUS. A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus power devices are as follows - i) ii) On plug-in to USB, the device must draw no more than 100mA. On USB Suspend the device must draw no more than 500A. iii) A Bus Powered High Power USB Device (one that draws more than 100mA) should use PWREN# to keep the current below 100mA on plug-in and 500A on USB suspend. iv) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub. v) No device can draw more that 500mA from the USB Bus. 6.2 Self Powered Configuration A USB Self Powered device gets its power from its own power supply and does not draw current from the USB bus. The EVAL232R is not designed to be used in a USB self powered configuration. However, the FT232R chip can be used in such a configuration. See the FT232R datasheet for more details on how to do this. 6.3 USB Bus Powered with Power Switching Configuration USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet the <= 500A total USB suspend current requirement (including external logic). Some external logic can 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 way of turning off power to external circuitry during USB suspend. This can be done using a discrete P-Channel Logic Level MOSFET to control the power to external logic circuits. A suitable device would be an International Rectifier (www.irf.com) IRLML6402, or equivalent. It is recommended that a "soft start" circuit consisting of a 1k series resistor and a 0.1F capacitor are used to limit the current surge when the MOSFET turns on. Without the soft start circuit there is a danger that the transient power surge of the MOSFET turning on will reset the FT232R, or the USB host / hub controller. The values used here allow attached circuitry to power up with a slew rate of ~12.5V per millisecond, in other words the output voltage will transition from GND to 5V in approximately 400 microseconds. Alternatively, a dedicated power switch I.C. with inbuilt "soft-start" can be used instead of a MOSFET. A suitable power switch I.C. for such an application would be a Micrel (www.micrel.com) MIC2025-2BM or equivalent. See the FT232R datasheet for more details, and an example schematic for a bus powered design with power switching. Please note the following points in connection with power controlled designs - i) ii) The logic to be controlled must have its own reset circuitry so that it will automatically reset itself when power is reapplied on coming out of suspend. Set the Pull-down on Suspend option in the internal EEPROM. iii) The PWREN# pin should be used to switch the power supply to the external circuitry. iv) For USB high-power bus powered device (one that consumes greater than 100mA, and up to 500mA of current from the USB bus), the power consumption of the device should be set in the max power field in the internal EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 Page 14 EEPROM. A high-power bus powered device must use this descriptor in the internal EEPROM to inform the system of its power requirements. v) For 3.3V power controlled circuits the VCCIO pin must not be powered down with the external circuitry (the PWREN# signal gets its VCC supply from VCCIO). Either connect the power switch between the output of the 3.3V regulator and the external 3.3V logic or power VCCIO from the 3V3OUT pin of the FT232R. 6.4 LED Interface The FT232RL's CBUS0 and CBUS1 pins on the EVAL232R are configured to drive LED's. CBUS0 is used to indicate reception of data (RXLED#) and CBUS1 is used to indicate transmission of data (TXLED#). When data is being transmitted or received the respective CBUS pin will drive from tri-state to low in order to provide indication on the LEDs of data transfer. A digital one-shot time is used so that even a small percentage of data transfer is visible to the end user. The FT232R CBUS pins have 3 configurable options for driving an LED - these are TXLED#, RXLED#, and TX&RXLED#. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 7. Module Circuit Schematic Page 15 Figure 5 shows the EVAL232R circuit schematic. For the EVAL232R the FT232RL has been used to make a USB to RS232 converter. A TTL - RS232 Level Converter I.C. is used on the serial UART of the FT232RL to make the RS232 level conversion. This, for example can be done using the popular "213" series of TTL to RS232 level converters. These devices have 4 transmitters and 5 receivers in a 28-LD SSOP package and feature an in-built voltage converter to convert the 5V (nominal) VCC to the +/- 9 volts required by RS232. An important feature of these devices is the SD pin which can power down the device to a low quiescent current during USB suspend mode. The RS232 level converter device used on the EVAL232R is a Zywyn ZT213LFEA which is capable of RS232 communication at up to 1Megabaud baud. In the EVAL232R CBUS0 and CBUS1 have been configured as TXLED# and RXLED#, and are being used to drive two LEDs which indicate transmission and reception of data. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 VCC J1 1 Ferrite Bead VCC VCCIO FB1 U2 VCC TXD 1 2 VCC3O CN1 TXD RXD RTS# CTS# DTR# DSR# DCD# DCD# 10 RI# 6 CBUS0 23 CBUS1 22 10nF + 3 DTR 1 U2 T3O SP213EHCA 1 T4O 28 GND C1 RXD 5 RTS# 3 16 USBDM 15 USBDP 20 VCC 2 3 4 VCC J2 1 CBUS0 TXDATA RTS RXDATA 2 3 4 T1O T2O R3I 27 CTS R3O 26 CTS# VCC 47pF 47pF VCCIO C2 8 NC 4 VCCIO FT232R DTR# 2 DSR# 9 CTS# 11 CBUS1 2 CBUS2 R2I SD 25 SLEEP# 3 CBUS3 RXD 5 R2O EN 24 RI DTR CTS TXDATA RTS RXDATA DSR DCD 5 9 4 8 3 7 2 6 1 PL1 DB9M 5 SLD 24 NC VCC3O 27 OSCI GND 28 OSCO RI# CBUS0 CBUS1 T E S T 26 RESET# 6 7 8 VCC TXD DSR# DSR 7 8 9 10 T1I R1O R1I GND R4O 22 RI# T4I 21 VCC3O 17 3V3OUT VCC C10 GND A G N D 25 T3I 20 DTR# R5O 19 DCD# 100nF 4.7uF + C9 100nF Figure 5 - EVAL232R Module Circuit Schematic C8 G N D 7 G N D 18 G N D 21 CBUS2 13 CBUS3 14 CBUS2 CBUS3 CBUS4 12 VCCIO C4 100nF 11 VCC 12 C1+ R5I 18 DCD V- 17 SLEEP# R2 270R R3 270R C5 100nF 13 14 V+ C1- C2- 16 GND LP1 LED RED LP2 LED GREEN C2+ 15 C6 100nF C7 100nF GND CBUS0 CBUS1 1 3 2 4 J3 EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 C3 19 RESET# RESET# 4 5 SHIELD RTS# 6 T2I 10 R4I 23 RI (c) Future Technology Devices International Ltd. 2005 Page 16 Page 17 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 values programmed into the internal EEPROM in the FT232RL used on the EVAL232R are shown in Table 18. Table 18 - Default Internal EEPROM Configuration Parameter USB Vendor ID (VID) USB Product ID (PID) Serial Number Enabled? Serial Number Pull Down I/O Pins in USB Suspend Manufacturer Name Manufacturer ID Product Description Max Bus Power Current Power Source Device Type USB Version Value 0403h 6001h Yes See Note Disabled FTDI FT EVAL232 Board USB <-> Serial 100mA Bus Powered FT232R 0200 Notes FTDI default VID (hex) FTDI default PID (hex) A unique serial number is generated and programmed into the EEPROM during final test of the EVAL232R module. Enabling this option will make the device pull down on the UART interface lines when the power is shut off (PWREN# is high) Returns USB 2.0 device descriptor to the host. Note: The device is be 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. 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 - Receive LED drive Default configuration of CBUS1 - Transmit LED drive Default configuration of CBUS2 - Power enable. Low after USB enumeration, high during USB suspend. Default configuration of CBUS3 - Power enable. Low after USB enumeration, high during USB suspend. Default configuration of CBUS4 - Low during USB suspend. Used to power down the EVAL232R's RS232 level converter IC. Signal on this pin becomes TXD# if enabled. Signal on this pin becomes RXD# if enabled. Signal on this pin becomes RTS if enabled. Signal on this pin becomes CTS if enabled. Signal on this pin becomes DTR if enabled. Signal on this pin becomes DSR if enabled. Signal on this pin becomes DCD if enabled. Signal on this pin becomes RI if enabled. Remote Wake up High Current I/Os Load VCP Driver CBUS0 CBUS1 CBUS2 CBUS3 CBUS4 Invert TXD Invert RXD Invert RTS# Invert CTS# Invert DTR# Invert DSR# Invert DCD# Invert RI# Enabled Disabled Enabled RXLED# TXLED# PWREN# PWREN# SLEEP# Disabled Disabled Disabled Disabled Disabled Disabled Disabled Disabled The internal EEPROM in the FT232R can be programmed over USB using the utility program MPROG. MPROG can be downloaded from the FTDI website. 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. EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 Disclaimer Copyright (c) Future Technology Devices International Limited , 2005. Version 0.9 - Initial Datasheet Created December 2005 Page 18 Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or electronic form without 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 International 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. Contact FTDI Head Office Future Technology Devices International Ltd. 373 Scotland Street, Glasgow G5 8QB, United Kingdom Tel. : +(44) 141 429 2777 Fax. : +(44) 141 429 2758 E-Mail (Sales) : sales1@ftdichip.com E-Mail (Support) : support1@ftdichip.com E-Mail (General Enquiries) : admin1@ftdichip.com Regional Sales Offices Future Technology Devices International Ltd. (Taiwan) 4F, No 16-1, Sec. 6 Mincyuan East Road, Neihu District, Taipei 114, Taiwan, R.o.C. Tel.: +886 2 8791 3570 Fax: +886 2 8791 3576 E-Mail (Sales): tw.sales@ftdichip.com E-Mail (Support): tw.support@ftdichip.com E-Mail (General Enquiries): tw.admin@ftdichip.com Future Technology Devices International Ltd. (USA) 5285 NE Elam Young Parkway, Suite B800 Hillsboro, OR 97124-6499 USA Tel.: +1 (503) 547-0988 Fax: +1 (503) 547-0987 E-Mail (Sales): us.sales@ftdichip.com E-Mail (Support): us.support@ftdichip.com E-Mail (General Enquiries): us.admin@ftdichip.com Website URL : http://www.ftdichip.com EVAL232R FT232RL USB to RS232 Evaluation Module Datasheet Version 0.90 (c) Future Technology Devices International Ltd. 2005 |
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