UM232R

UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 Future Technology Devices International Ltd UM232R USB - Serial UART Development Module Datasheet 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. 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 © Future Technology Devices International Limited 1 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 1 Introduction The UM232R is a development module which uses FTDI’s FT232RL, one of FTDI’s range of USB to UART interface integrated circuit devices. The FT232RL is a USB to serial UART interface with optional clock generator output, and the FTDIChip-ID™ security dongle feature. In addition, asynchronous and synchronous bit bang interface modes are available. 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-ID™) 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. (Safe-Guard-IT). The UM232R is supplied on a PCB which is designed to plug into a standard 0.6” wide 24 pin DIP socket. All components used, including the FT232RL are Pb-free (RoHS compliant). Figure 1.1 – UM232R USB Serial UART Development Module Copyright © Future Technology Devices International Limited 2 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 Table of Contents 1 Introduction .................................................................... 2 2 Typical Application .......................................................... 5 3 2.1 Driver Support .......................................................................... 5 2.2 Features .................................................................................... 6 FT232RL Features and Enhancement .............................. 7 3.1 4 Key Features ............................................................................. 7 UM232R Pin Out and Signal Descriptions ...................... 10 4.1 UM232R Pin Out ...................................................................... 10 4.2 Signal Descriptions ................................................................. 10 4.3 Jumper Configuration Options ................................................ 12 4.4 CBUS Signal Options ............................................................... 12 5 Module Dimensions ....................................................... 14 6 FT232RL Device Characteristics and Ratings ................. 15 7 6.1 Absolute Maximum Ratings ..................................................... 15 6.2 DC Characteristics ................................................................... 15 6.3 EEPROM Reliability Characteristics ......................................... 18 6.4 Internal Clock Characteristics ................................................. 18 Module Configurations .................................................. 19 7.1 BUS Powered Configuration .................................................... 19 7.2 Self Powered Configuration .................................................... 20 7.3 USB Bus Powered with Power Switching Configuration .......... 21 7.4 Bus Powered with 3.3V Logic Drive / IO Supply Voltage ......... 22 8 UM232R Module Circuit Schematic ................................ 24 9 Internal EEPROM Configuration..................................... 25 10 Contact Information ...................................................... 27 Appendix A – References ................................................... 28 Document References ..................................................................... 28 Acronyms and Abbreviations ........................................................... 28 Appendix B – List of Tables and Figures ............................. 29 Copyright © Future Technology Devices International Limited 3 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 List of Tables ................................................................................... 29 List of Figures ................................................................................. 29 Appendix C – Revision History ........................................... 30 Copyright © Future Technology Devices International Limited 4 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 2 Typical Application  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 / 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  USB Medical applications 2.1 Driver Support Royalty-Free VIRTUAL COM PORT (VCP) DRIVERS for: Royalty-Free D2XX Direct Drivers (USB Drivers + DLL S/W Interface):  Windows 10 32,64-bit  Windows 10 32,64-bit  Windows 8 / 8.1 32,64-bit  Windows 8 / 8.1 32,64-bit  Windows 7 32,64-bit  Windows 7 32,64-bit  Windows Vista  Windows Vista  Windows XP 32,64-bit  Windows XP 32,64-bit  Windows XP Embedded  Windows XP Embedded.  Windows 98, 98SE, ME, 2000, Server 2003, XP and Server 2008  Windows 98, 98SE, ME, 2000, Server 2003, XP and Server 2008  Windows CE.NET 4.2 , 5.0 and 6.0  Windows CE.NET 4.2, 5.0 and 6.0  MAC OS OS-X  MAC OS OS-X  Linux 2.4 and greater  Linux 2.4 and greater The drivers listed above are all available to download for free from www.ftdichip.com. Various 3rd Party Drivers are also available for various other operating systems – visit www.ftdichip.com for details. Copyright © Future Technology Devices International Limited 5 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 2.2 Features The UM232R has the following features:  Single chip USB to UART synchronous serial data transfer interface  Entire USB protocol handled on the 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.   On board jumper allows for selection of USB bus powered supply or self-powered supply. 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. Data transfer rates from 300 baud to 3 Megabaud (RS422 / RS485 and at TTL levels) and 300 baud to 1 Megabaud (RS232).  True 5V / 3.3V / 2.8V / 1.8V CMOS drive output and TTL input.  High I/O pin output drive option.  FTDI’s royalty-free VCP and D2XX drivers eliminate the requirement for USB driver development in most cases.  Integrated USB resistors.  Integrated power-on-reset circuit.  In-built support for event characters and line break condition.   USB FTDIChip-ID™ feature. Fully integrated clock – no external crystal, oscillator, or resonator required.  Configurable CBUS I/O pins.   Auto transmit buffer control for RS485 applications. Fully integrated AVCC supply filtering – No separate AVCC pin and no external R-C filter required.  UART signal inversion option.  Transmit and receive LED drive signals.  USB bulk transfer mode.  New 48MHz, 24MHz, 12MHz, and 6MHz clock output signal Options for driving external MCU or FPGA.  +4.0V to +5.25V Single Supply Operation.  Low operating and USB suspend current.  Low USB bandwidth consumption.  UHCI / OHCI compatible  USB 2.0 Full Speed compatible.  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.  Support for USB suspend and resume.  Integrated 1024 bit internal EEPROM for storing USB VID, PID, serial number and product description strings, and CBUS I/O configuration.  Device supplied preprogrammed unique USB serial number. /  -40°C to 85°C temperature range. with EHCI host extended controller operating  Supplied in PCB designed to fit a standard 15.0mm (0.6”) wide 24 pin DIP socket. Pins are on a 2.60mm (0.1”) pitch.  On board USB ‘B’ socket allows module to be connected to a PC via a standard A to B USB cable. Support for bus powered, self-powered, and high-power bus powered USB configurations. Copyright © Future Technology Devices International Limited 6 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 3 FT232RL Features and Enhancement 3.1 Key Features This section summarises the key features and enhancements of the FT232RL IC device which is used on the UM232R Module. For further details, consult the FT232R datasheet, which is available from www.ftdichip.com. 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 preferred, an external 12MHz crystal can be used as the clock source. Note that the UM232R does not provide access to these pins on the FT232R device. 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 pre-programmed 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 kΩ 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 pre-programmed – see Section 9 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. Copyright © Future Technology Devices International Limited 7 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 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 www.ftdichip.com. 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 4.0V to 5.25V. Bus powered designs would still take their supply from the 5V on the USB bus. 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 70μA. This allows greater margin for peripheral designs to meet the USB suspend current limit of 500μA. 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 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-ID™ - 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-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 describing this feature is available separately from www.ftdichip.com. 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. Copyright © Future Technology Devices International Limited 8 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 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. Extended Operating Temperature Range – The FT232R operates over an extended temperature range of -40º to +85º C thus allowing the device to be used in automotive and industrial applications. 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. Copyright © Future Technology Devices International Limited 9 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 4 UM232R Pin Out and Signal Descriptions 4.1 UM232R Pin Out Figure 4.1 Module Pin Out and Jumper Locations 4.2 Signal Descriptions Pin Name Type Description 1 TXD Output Transmit Asynchronous Data Output.* 2 DTR# Output Data Terminal Ready Control Output / Handshake Signal.* 3 RTS# Output Request to Send Control Output / Handshake Signal.* No. +1.8V to +5.25V supply to the UART Interface and CBUS I/O pins (1...3, 5, 6, 9...14, 22, 23). 4 VIO PWR In USB bus powered designs connect to 3V3 to drive out at 3.3V levels (connect jumper J1 pins 1 and 2 together), or connect to VCC to drive out at 5V CMOS level (connect jumper J1 pins 2 and 3 together). 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 a regulator which is supplied by the 5V on the USB bus should be used. Copyright © Future Technology Devices International Limited 10 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Pin Clearance No.: FTDI# 125 Name Type Description 5 RXD Input Receiving Asynchronous Data Input.* 6 RI# Input Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low >20ms can be used to resume the PC USB host controller from suspend.* 7, 24 GND PWR Module Ground Supply Pins 8 DSR# Input Data Set Ready Control Input / Handshake Signal.* 9 DCD# Input Data Carrier Detect Control Input. 10 CTS# Input Clear To Send Control Input / Handshake Signal.* 11 CB4 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default pin function is SLEEP#. See CBUS Signal Options, Table 4.4.* 12 CB2 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default pin function is TXDEN. See CBUS Signal Options,Table 4.4.* 13 SLD GND USB Cable Shield. Output 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. No. 14 15, 21 USB VCC PWR or Output These two pins are internally connected on the module PCB. To power the module from the 5V supply on USB bus connects jumper J2 pins 1 and 2 together (this is the module default configuration). In this case these pins would have the same description as pin 14. To use the UM232R module in a self-powered configuration ensure that jumper J2 pins 1 and 2 are not connected together, and apply an external 4.0V to 5.25V supply to one of these pins. 17 PU1 Contro l Pull up resistor pin connection 2. Connect to pin 20 (RST#) in a self-powered configuration. 16 PU2 Contro l Pull up resistor pin connection 1. Connect to pin 14 (USB) in a self-powered configuration. 18 CB3 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default pin Function is PWREN#. See CBUS Signal Options, Table 4.4.* 3.3V output from integrated L.D.O. regulator. This pin is decoupled to ground on the module PCB with a 10nF capacitor. The prime purpose 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 FT232RL’s VCCIO pin by connecting this pin to pin 4 (VIO), or by connecting together pins 1 and 2 on jumper J1. 19 3V3 Output 20 RST# Input Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCCIO. 22 CB1 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default pin Function is RXLED#. See CBUS Signal Copyright © Future Technology Devices International Limited 11 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Pin No. Name Type Clearance No.: FTDI# 125 Description Options, Table 4.4.* 23 CB0 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory Default pin Function is TXLED#. See CBUS Signal Options,Table 4.4.* Table 4.1Module Pin Out Description * When used in Suspend, these 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. 4.3 Jumper Configuration Options Pin Name Type Description 1 3V3 Output Connect this pin to pin 2 to create 3V3 I/O. 2 VIO PWR Input Pin for Chip VCCIO 3 VCC PWR Connect this pin to pin 2 to create 5V I/O Table 4.2 Jumper J1 Pin Description Pin No. Name Type Description USB PWR 5V Power output USB port. For a low power USB bus power design, up to 100mA can be sourced from the 5V supply on the USB bus. A maximum of 500 mA can be sourced from the USB bus in a high power USB bus powered design. VCC PWR or Output No. 1 2 Board supply input. Connect to jumper J2 pin 1 in order to supply the board from the USB bus. This pin is internally connected to the VCC DIP pins. Remove the jumper connector in a self-powered design. Table 4.3 Jumper J2 Pin Description 4.4 CBUS Signal Options 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 FT_PROG, which can be downloaded from the www.ftdichip.com. The default configuration is described in Section 9. CBUS Signal Available On CBUS Pin Description TXDEN# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Enable transmit data for RS485 PWREN# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Goes low after the device is configured by USB, then high during USB suspend. Can be used to control power to external logic in high power designs. Needs 10k pull up to VCC. Option Copyright © Future Technology Devices International Limited 12 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 CBUS Signal Clearance No.: FTDI# 125 Available On CBUS Pin Description TXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Transmit data LED drive – pulses low when transmitting data via USB. RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Receive data LED drive – pulses low when receiving data via USB. TX&RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 LED drive – pulses low when transmitting or receiving data via USB. See CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 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. Option SLEEP# CLK48 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 48MHz Clock output. CLK24 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 24 MHz Clock output. CLK12 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 12 MHz Clock output. CLK6 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 6 MHz Clock output. CbitBangI/O CBUS0, CBUS1, CBUS2, CBUS3 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. (www.ftdichip.com) BitBangWRn CBUS0, CBUS1 Synchronous and asynchronous bit bang mode WR# strobe Output. BitBangRDn CBUS0, CBUS1, CBUS2, CBUS3 Synchronous and asynchronous bit bang mode RD# strobe Output. Table 4.4 CBUS Signal Options Copyright © Future Technology Devices International Limited 13 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 5 Module Dimensions Figure 5.1 UM232R Module Dimensions All dimensions are in millimetres, with inches in parenthesis. These should be used as a guide only. The FT232RL is supplied in a RoHS compliant 28 pin SSOP 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 UM232R module uses exclusively lead free components, and are fully compliant with European Union directive 2002/95/EC. Copyright © Future Technology Devices International Limited 14 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 6 FT232RL Device Characteristics and Ratings 6.1 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 -65°C to 150°C Degrees C Floor Life (Out of Bag) At Factory Ambient 168 Hours Hours (30°C / 60% Relative Humidity) (IPC/JEDEC J-STD-033A MSL Level 3 Compliant)* Ambient Temperature (Power Applied) -40°C to 85°C Degrees C VCC Supply Voltage -0.5 to +6.00 V D.C. Input Voltage – USBDP and USBDM -0.5 to +3.8 V D.C. Input Voltage – High Impedance Bidirectional -0.5 to + (VCC +0.5) V D.C. Input Voltage – All Other Inputs -0.5 to + (VCC +0.5) V D.C. Output Current – Outputs 24 mA D.C. Output Current – Low Impedance Bidirectional 24 mA Power Dissipation (VCC = 5.25V) 500 Table 6.1 Absolute Maximum Ratings 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. 6.2 DC Characteristics DC Characteristics (Ambient Temperature = -40 to 85°C) Parameter Description Minimum Typical Maximum Units Conditions VCC1 VCC Operating Supply Voltage 4.0 --- 5.25 V VCC2 VCCIO Operating Supply Voltage 1.8 --- 5.25 V Icc1 Operating Supply Current --- 15 --- mA Normal Operation Icc2 Operating Supply Current 50 70 100 Table 6.2 Operating Voltage and Current μA USB Suspend Because the UM232R module does not provide access to the OSCI and OSCO pins, the VCC range of this module has a minimum value of +4.0V. The FT232R device on this module is capable of operating down to +3.3V but its internal oscillator is only specified for operation down to +4.0V and so an external crystal must be used when VCC is in the range +3.3V to +4.0V. Copyright © Future Technology Devices International Limited 15 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Parameter Description Minimum Typical Maximum Units Clearance No.: FTDI# 125 Conditions Voh Output Voltage High 3.2 4.1 4.9 V I source = 2mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 2mA Vin Input Switching Threshold 1.3 1.6 1.9 V ** Vhys Input Switching Hysteresis 50 55 60 mV ** Table 6.3 UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.2 2.7 3.2 V I source = 1mA Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 2mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** Vhys Input Switching Hysteresis 20 25 30 mV ** Table 6.4 UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.1 2.6 3.1 V I source = 1mA Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 2mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** Vhys Input Switching Hysteresis 20 25 30 mV ** Table 6.5 UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 3.2 4.1 4.9 V I source = 6mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 6mA Vin Input Switching Threshold 1.3 1.6 1.9 V ** Vhys Input Switching Hysteresis 50 55 60 mV ** Table 6.6 UART and CBUS I/O Pin Characteristics (VCCIO = 5.0V, High Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.2 2.8 3.2 V I source = 3mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 8mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** Vhys Input Switching Hysteresis 20 25 30 mV ** Table 6.7 UART and CBUS I/O Pin Characteristics (VCCIO = 3.3V, High Drive Level) Copyright © Future Technology Devices International Limited 16 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Parameter Description Clearance No.: FTDI# 125 Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.1 2.8 3.2 V I source = 3mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 8mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** Vhys Input Switching Hysteresis 20 25 30 mV ** Table 6.8 UART and CBUS I/O Pin Characteristics (VCCIO = 2.8V, High Drive Level) ** Inputs have an internal 200kΩ pull-up resistor to VCCIO Parameter Vin Vhys Parameter Uvoh Description Input Switching Threshold Minimum Typical Maximum Units 1.3 1.6 1.9 V Conditions Input Switching Hysteresis 50 55 60 mV Table 6.9 RESET# and TEST Pin Characteristics Description I/O Pins Static Output (High) Uvol I/O Pins Static Output (Low) Uvse Minimum 2.8 Typical --- Maximum 3.6 Units Conditions V RI = 1.5kΩ to 3V3Out (D+) RI = 15KΩ to GND (D-) RI = 1.5kΩ to 3V3Out (D+) RI = 15kΩ to GND (D-) 0 --- 0.3 V Single Ended Rx Threshold 0.8 --- 2.0 V Ucom Differential Common Mode 0.8 --- 2.5 V UVDif Differential Input Sensitivity 0.2 --- --- V UdrvZ Driver Output Impedance 26 29 44 Ohms Table 6.10 USB I/O Pin (USBDP, USBDM) Characteristics *** *** Driver Output Impedance includes the internal USB series resistors on USBDP and USBDM pins Copyright © Future Technology Devices International Limited 17 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 6.3 EEPROM Reliability Characteristics The internal 1024 bit EEPROM has the following reliability characteristics: Parameter Value Unit Data Retention 15 Years Read / Write Cycle 100,000 Cycles Table 6.11 EEPROM Characteristics 6.4 Internal Clock Characteristics The internal Clock Oscillator has the following characteristics: Parameter Value Unit Minimum Typical Maximum Frequency of Operation 11.98 12.00 12.02 MHz Clock Period 83.19 83.33 83.47 ns Duty Cycle 45 50 55 Table 6.12 Internal Clock Characteristics Copyright © Future Technology Devices International Limited % 18 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 7 Module Configurations 7.1 BUS Powered Configuration Figure 7.1 Bus Powered Configuration Figure 7.1 illustrates the UM232R module in a typical USB bus powered design configuration. This can easily be done by fitting the jumper link on J2, as shown above. The UM232R is supplied in this configuration by default. A USB Bus Powered device gets its power from the USB bus. Basic rules for USB Bus Power devices are as follows: i) On plug-in to USB, the device must draw no more than 100mA. ii) On USB suspend the device must draw no more than 500μA. iii) 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 500μA on USB suspend. iv) A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub. v) No device can draw more that 500mA from the USB Bus. Interfacing the UM232R module to a microcontroller (MCU), or other logic for a bus powered design would be done in exactly the same way as for a self-powered design (see Section 7.2), except that the MCU or external logic would take its power supply from the USB bus (either the 5V on the USB pin, or 3.3V on the 3V3 pin). Copyright © Future Technology Devices International Limited 19 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 7.2 Self Powered Configuration Vcc = 3.3V – 5V Vcc = 4.0V – 5V UM232R © FTDI 2008 TXD 1 1 2 3 24 GND 21 VCC 20 RST# 17 PU1 16 PU2 15 VCC 14 USB J1 TXD RXD RTS# 3 RXD 5 GND 7 FTDI CTS# FT232RL RTS# MCU CTS# 10 2 J2 12 1 13 Figure 7.2 Self-Powered Configuration Figure 7.2 illustrates the UM232R in a typical USB self-powered configuration. In this case the link on jumper J2 is removed, and an external supply is connected to the module VCC pins. Figure 7.2 illustrates a self-powered design which has a 4.0V – 5V supply. A USB Self-Powered device gets its power from its own power supply and does not draw current from the USB bus. The basic rules for USB Self-powered devices are as follows: i) A Self-Powered device should not force current down the USB bus when the USB Host or Hub Controller us powered down. ii) A Self-Powered Device can use as much current as it likes during normal operation and USB suspend as it has its own power supply. iii) A Self-Powered Device can be used with any USB Host and both Bus and Self-Powered USB Hub. In this case the power descriptor in the internal EEPROM should be programmed to a value of zero (selfpowered). In order to meet requirement (i) the USB Power is used to control the RESET# Pin of the FT232R device. When the USB Host or Hub is powered up the internal 1.5kΩ resistor on USBDP is pulled up to 3.3V, thus identifying the devices as a full speed device to USB. When the USB Host or Hub Power is off, RESET# will go low and the device will be held in reset. As RESET# is low, the internal 1.5kΩ resistor will not be pulled up to 3.3V, so no current will be forced down USBDP via the 1.5kΩ pull-up resistor when the host or hub is powered down. To do this pin 14 (USB) is connected to PU2 and PU1 is connected to RST#. Failure to do this may cause some USB host or hub controllers to power up erratically. Copyright © Future Technology Devices International Limited 20 UM232R USB - Serial UART Development Module Datasheet Version 1.3 Document No.: FT_000051 Clearance No.: FTDI# 125 Note: When the FT232R is in reset, the UART interface pins all go tristate. These pins have internal 200kΩ pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic. Figure 7.2 is also an example of interfacing the FT232R to a Microcontroller (MCU) UART interface. This example uses TXD and RXD for transmission and reception of data and RTS# / CTS# hardware handshaking. Optionally, RI# can be connected to another I/O pin on the MCU and could be used to wake up the USB host controller from suspend mode. One of the CBUS pins could be configured as a 6/12/24/48 MHz clock output which can be used to clock the MCU. If the MCU is handling power management functions, then a CBUS pin can be configured as PWREN# and should also be connected to an I/O pin of the MCU. 7.3 USB Bus Powered with Power Switching Configuration P-Channel Power MOSFET s d UM232R © FTDI 2008 TXD 1 1 2 0.1uF Soft Start Circuit J1 TXD RXD 1K RTS# 3 RXD 5 GND 7 FTDI FT232RL RTS# CTS# 0.1uF g 24 3 MCU CTS# 18 CB3 (PWREN#) 10 2 1 J2 12 14 USB 13 Figure 7.3 Bus Powered with Power Switching Configuration USB Bus Powered circuits need to be able to power down in USB