USBMOD3 User's Manual
Contents
1. Outputs 0 ccc cece ccc cee e eee e eee eees 24mA DC Output Current Low Impedance Bidirectionals 24mA Power Dissipation ege 500mW DC Characteristics Ambient Temperature 0 C 70 C Operating Voltage and Current Voltage VIO E Current Current UART I O Pin Characteristics VIO 5V Output Voltage High 44 49 V Isource 2mA_ Output VoltageLow 01 07 V Isink 4mA Vin Input Switching 1 1 1 5 1 8 V Note 1 Threshold VHys Input Switching 200 mV Hysteresis UART I O Pin Characteristics VIO 3 3V Output Voltage High 27 32 IN Isource 2mA Output Voltage Low PPOR FPE EC ERR I sink 4 mA Note 1 Input Switching Threshold Hysteresis Note Inputs have an internal 200kQ pull up resistor to VIO Ravar Pty Ltd Version 1 0 Page 12 of 14 http www ravar net R I USBMOD3 User e Manual RSTI ECS EDAT I O Pin Characteristics Yon gn Voltage High 4d 4a LV Tsouree 2 mA _ Output VoltageLow 01 07 v Isink 4mA Input Switching H Ee Threshold aa jis is v EE Hysteresis Note 2 ECS and EDAT pins have an internal 200kQ pull up resistor to V RSTO Pin Characteristics EE Yon Output Spee Tri State USB O Pin Characteristics RI 1 5kU to I O Pins Static 44 A0 y ao D RI Output High l l 15kU to GND D RI 1 5k to I O Pin Static 01 07 v 3V30ut D R1 Output Low See to GND Single Ended2. product quality issues with this product please contact our quality assurance manager at the above address Disclaimer This product and its documentation are provided as is and no warranty is made or implied as to their suitability for any particular purpose Ravar Pty Ltd will not accept any claim for damages arising from the use of this product or documentation This document provides information on our products and all efforts are made to ensure the accuracy of the information contained within The specifications of the product are subject to change and continual improvement Ravar Pty Ltd Version 1 0 Page 14 of 14 http www ravar net
3. O PWR _ 3 0 volt to 5 25 volt VCC to the UART interface pins 10 12 14 16 and 18 25 When interfacing with 3 3v external logic connect VIO to the 3 3v supply of the external logic otherwise connect to V to drive out at 5v CMOS level Ravar Pty Ltd Version 1 0 Page 6 of 14 http www ravar net R I USBMOD3 User e Manual USBMOD3 PINOUT TABLE Continued SIGNAL TYPE DESCRIPTION TXLD LED Drive Pulses Low when Transmitting Data via USB PCTL N Bus Powered Tie Low Self Powered Tie High 19 PEN Goes Low after the device is configured via USB then high during USB suspend Can be used to control power to external logic using a P Channel Logic Level MOSFET Switch Enable the Interface Pull Down Option in EEPROM when usin 4 the PEN pin this way R IN UART Ring Indicator Control Input ES a Ss 23 DSR IN UART Data Send Ready Control un UART Receive Data Input Device Ground Supply Pin 30 D WO USBDataSignalMinus o Device Ground Supply Pin The following page shows the schematic for the USBMOD3 Ravar Pty Ltd Version 1 0 Page 7 of 14 http www ravar net USBMOD3 User s Manual pe USBMOD3 SCHEMATIC JIU ADADA MMM PIT Sd YVA VA Z00OZ LHDINKdOD IUDUIYIS EAOW ISN aNd AUOOlL E asn INOJ Dag aja JA ONId AINON HO TE6 cil 2 um rx CI T ONId WINdOW http www ravar net Page 8 of 14 Version 1 0 Ravar
4. Pty Ltd BI us MODS User s Manual Driver Installation Your first choice when using the USBMOD3 is whether you want to use the Virtual COM Port driver or the Direct DLL driver For programming simplicity the best driver is the Virtual COM Port and when installed the USBMOD3 will appear in the System Properties Device Manager as an USB Serial Port COMn as follows SYSTEM PROPERTIES CDROM Gel Disk drives m Display adapters GH Floppy disk controllers Hard disk controllers 48 Keyboard a Modem Monitors Mouse H9 Network adapters a Ports COM amp LPT Communications Port COM Ze Communications Port COM oo ECP Printer Port LPT 1 oe A Printer Port LPT 2 i SA USB Serial Port COM3 E G S G G S St The COM Port number will vary depending on the number of existing COM Ports on your computer and the number of USBMOD3 s connected to your system To install the Virtual COM Port drivers download the driver from our website and unzip the files to a local directory Then connect the USBMOD3 and windows will automatically ask for the driver select to specify a location and browse to the directory where you have unzipped the files Use the Non Plug amp Play driver for the USBMOD3 to avoid a delay identifying Ravar Pty Ltd Version 1 0 Page 9 of 14 http www ravar net R I USBMOD3 User e Manual Once the Virtual COM Port is installed it can be programmed exactly as
5. R I USBMOD3 User e Manual USBMOD3 USB Plug and Play Serial Development Module Second Generation The USBMOD3 shown in Diagram 1 is a second generation low cost integrated module for transferring serial data over USB Based on the FTDI FT232BM USB UART IC the USBMODS3 is capable of transfer rates of up to 1000k baud RS232 and 3000k baud RS422 RS485 The USBMOD3 offers a complete plug and play solution making it ideal for rapid prototyping and development AL ee m s L IT Lien S10 Pt ASA I I i d i i L SALLE i ls kee p km E EP Diagram 1 MODULE FEATURES e Single module High Speed USB UART solution e No external passive components e Based on the FIDI FT232BM required High Speed USB UART IC e Module powered from USB bus e Integrated Type B USB in addition to supplying up to Connector 450mA user application e On board 6MHz Crystal e 32 pin Dual In Line Package Ideal for prototyping e External EEPROM on board for USB enumeration data e Fits into a standard 32 pin 600mil IC Socket Ravar Pty Ltd Version 1 0 Page 1 of 14 http www ravar net R I USBMOD3 User e Manual FT232BM IC FEATURES e Single Chip Multi Function Data Transfer Solution e UHCI OHCI EHCI Compliant e RS232 link from 300 baud to e USB 1 1 and USB 2 0 1000K baud Compatible e RS422 RS485 Link to 3000K e USB VID PID Serial Number baud and Product Description Strings in external EEPROM e 384 byte receive
6. RX vame Ty o o Differential ucom IB 08 loo TI Sensitivit Impedance Note 3 Driver Output Impedance includes the external 27U series resistors on D and D pins Ravar Pty Ltd Version 1 0 Page 13 of 14 http www ravar net R I USBMOD3 User e Manual Technical Support and Further Information For any questions relating to the USBMOD3 please contact us by Email Fax or Phone Email support ravar net Fax 61 755 914364 Ph 61 755 325688 Ravar Pty Ltd Ravar Pty Ltd 5G Jackman Center PO Box 2514 Jackman Street Southport Southport Queensland 4215 Queensland 4215 Australia Australia Product Use Limitations Warranty and Quality Statement The USBMOD3 should not be used in any situation where it s failure or failure of the PC or software controlling it could cause human injury or severe damage to equipment This device is not designed for or intended to be used in any life critical application The USBMOD3 is warranted to be free from manufacture defects for a period of 12 months from the date purchase Subjecting the device to conditions beyond the Absolute Maximum Ratings listed above will invalidate this warranty The USBMOD3 is a static sensitive device anti static procedures should be used in the handling of this device All USBMOD3 units are extensively tested at time of manufacture to be free of defects Ravar is committed to providing products of the highest quality Should you experience any
7. a regular serial COM port using the MSComm control from Visual Basic or API calls from C or other languages Set the COM port to the same number as appears in the Device Manager the baud rate stop bits parity etc are not used as the device always runs at full speed The Direct DLL driver is installed in a similar manner but using the alternative download from the website Programming the Direct DLL driver is by call to the DLL Library functions Please download the Direct DLL programmers guide from the Ravar website Application Notes The USBMOD3 is a quick and simple way of changing from existing RS232 to USB The existing RS232 interface adaptor can be replaced with a USBMOD3 in a matter of minutes by connecting TX RX and handshake lines DB 9 Pin Connector MAX232 TX Handshakes Or similar 1x Handshakes Deg EE RS232 gt HEED KEE e To existing circuitr to PC via Serial RX Handshakes Interface R y Can replace the MAX232 or similar RX Handshakes RS232 Interface adaptor with a USBMOD3 Connection to PC via USB USBMOD3 On the following pages there are schematic drawings showing various sample applications for the USBMOD3 The first application is a USB to RS232 converter which is capable of achieving a maximum of 115k baud The RS232 interface chip that we are using is a MAX213 chip Ravar Pty Ltd Version 1 0 Page 10 of 14 http www ravar net USBMOD3 User s Manual SAMPLE APPLICATION No 1 ye p
8. a stable reset to external MCU and other devices RSTO was the TEST pin on the previous generation of devices s Integrated RCCLK Circuit In the previous devices an external RC circuit was required to ensure that the oscillator and clock multiplier PLL frequency was stable prior to enabling the clock internal to the device This circuit is now embedded on chip the pin assigned to this function is now designated as the TEST pin and should be tied to GND for normal operation e Integrated Level Converter on UART interface and control signals The previous devices would drive the UART and control signals at 5v CMOS logic levels The new device has a separate VCC IO VIO on the module pin allowing the device to directly interface to 3 3v and other logic families without the need for external level converter I C s s Improved Power Management control for USB Bus Powered high current devices The previous devices had a USBEN pin which became active when the device was enumerated by USB To provide power control this signal had to be externally gated with SLEEP and RESET This gating is now done on chip USBEN has now been replaced with the new PWREN signal PEN on the module which can be used to directly drive a transistor or P Channel MOSFET in applications where power switching of external circuitry is required A new EEPROM based option makes the device pull gently down its UART interface lines when the power is s
9. buffer 128 byte transmit buffer for high data VIRTUAL COM PORT VCP throughput DRIVERS for e Windows 98 98 SE and ME e Full hardware assisted or X e Windows 2000 XP On X Off handshaking e Windows CE e MAC OS 8 and OS9 e Support for Event Characters and e MAC OS X Line Break condition e Linux 2 40 and greater e Auto Transmit Buffer control for In planning or under development RS485 FTD2XX e Compact 32 pin 7mm x 7mm USB Direct Drivers DLL S W Interface MQEP package e Windows 98 98 SE and ME e Windows 2000 XP e Integrated 6Mhz 48Mhz Clock Multiplier aids emissions compliance e Integrated 3 3v Regulator No External Regulator Required ENHANCEMENTS This section summarises the enhancements of the 2nd generation device compared to its FT8U232AM predecessor For further details consult the device pin out description and functional descriptions e Integrated Power On Reset POR RSTI on the module is maintained in Circuit order to allow external logic to reset the The device now incorporates an internal device where required however for POR function The existing RESET pin many applications this pin can now be Ravar Pty Ltd Version 1 0 Page 2 of 14 http www ravar net E R I USBMOD3 User s Manual either left N C or hard wired to VCC V on the module In addition a new reset output pin RSTO or RSTO on the module is provided in order to allow the new POR circuit to provide
10. er e Manual USBMOD3 PINOUT PIN 32 31 B USB1 30 V GND D G 29 ecs L B D 28 Al DAT 26 25 Ge 24 RSTO 23 22 echt 21 20 19 d 18 wwwyravar net 17 USBMOD3 DIAGRAM 2 On the following page is the pin out table showing what the various pins are on the module Ravar Pty Ltd Version 1 0 Page 5 of 14 http www ravar net R I USBMOD3 User e Manual USBMOD3 PINOUT TABLE SIGNAL TYPE DESCRIPTION 1 G PWR _ Device Ground Supply Dn 2 GND PWR Device Ground Supply Pin Al B PWR _ USBBusPowerr 4 V PWR Device 4 4 volt to 5 25 volt Power Supply Pin 6 EIK TO PEROM Gok EDAT a required tie to VCC Oe ll operation or 3V3 to instruct PC to connect to device 10 RSTO OUT Output of the internal Reset Generator Stays high impedance for 2ms after VCC gt 3 5v and the internal clock starts up then clamps it s output to the 3 3v output of the internal regulator Taking RSTI low will also force RSTO to go high impedance RSTO is NOT affected by a USB Bus Reset 11 3V3 OUT 3 3 volt Output from the integrated L D O regulator This pin should be decoupled to GND using a 33nF ceramic capacitor in close proximity to the device pin Its prime purpose is to provide the internal 3 3v supply to the USB transceiver cell and the RSTO pin A small amount of current lt 5mA can be drawn from this pin to power external 3 3v logic if required 12 VI
11. hut 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 e Lower Suspend Current Integration of RCCLK within the device and internal design improvements reduce the suspend current of the FT232BM to under 200uA excluding the 1 5k pull up on USBDP in USB suspend mode This allows greater margin for peripherals to meet the USB Suspend current limit of 500uA e Support for USB Isocronous Transfers Whilst USB Bulk transfer is usually the best choice for data transfer the scheduling time of the data is not guaranteed For applications where scheduling latency takes priority over data integrity such as transferring audio and low bandwidth video data the new device now offers an option of USB Isocronous transfer via an option but in the EEPROM e Programmable Receive Buffer Timeout In the previous device the receive buffer timeout used to flush remaining data from the receive buffer was fixed at l6ms timeout This timeout is now programmable over USB in Ims increments from lms to 255ms thus allowing the device to be better optimised for protocols requiring faster response times from short data packets Ravar Pty Ltd Version 1 0 Page 3 of 14 http www ravar net E R I USBMOD3 User s Manual e TXDEN Timing fix TXDEN timing has now been fixed to
12. ible to connect the device to an SRAM configurable FPGA as supplied by vendors such as Altera and Xilinx The FPGA device would normally be un configured Oe have no defined function at power up Application software on the PC could use Bit Bang Mode to download configuration data to the FPGA which would define its hardware function then after the FPGA device is configured the FT232BM can switch back into UART interface mode to allow the programmed FPGA device to communicate with the PC over USB This approach allows a customer to create a generic USB peripheral who s hardware function can be defined under control of the application software The FPGA based hardware can be easily upgraded or totally changed simply by changing the FPGA configuration data file Application notes software and development modules for this application area will be available from FTDI and other 3rd parties For further information regarding the FTDI FT232BM USB UART IC please refer to the FT232BM Datasheet This datasheet can be found on the Ravar website at http www ravar net As mentioned above in module features the USBMOD3 is in a 32 pin Dual In Line Package This allows the module to fit into a standard 32 pin 600mil IC Socket which makes the module ideal for prototyping and development work Shown in Diagram 2 below is the pin out for the USBMOD3 Ravar Pty Ltd Version 1 0 Page 4 of 14 http www ravar net R I USBMOD3 Us
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14. remove the external delay that was previously required for RS485 applications at high baud rates TXDEN now works correctly during a transmit send break condition e Relaxed VCC Decoupling The 2nd generation devices now incorporate a level of on chip VCC decoupling Though this does not eliminate the need for external decoupling capacitors it significantly improves the ease of PCB design requirements to meet FCC CE and other EMI related specifications e Improved PreScaler Granularity The previous version of the Prescaler supported division by n 0 n 0 125 n 0 25 and n 0 5 where n is an integer between 2 and 16 384 Sei To this we have added n 0 375 n 0 625 n 0 75 and n 0 875 which can be used to improve the accuracy of some baud rates and generate new baud rates which were previously impossible especially with higher baud rates e Bit Bang Mode The 2nd generation device has a new option referred to as Bit Bang mode In Bit Bang mode the eight UART interface control lines can be switched between UART interface mode and an 8 bit Parallel IO port Data packets can be sent to the device and they will be sequentially sent to the interface at a rate controlled by the prescaler setting As well as allowing the device to be used stand alone as a general purpose IO controller for example controlling lights relays and switches some other interesting possibilities exist For instance it may be poss
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