USBMOD4 User`s Manual
Contents
1. lt o a E nN NOL s244 9H ASUH Em gt Wm Wes Inox amp amp ott ON JS yA ODA so ees dyla f 8992186 cn t 20A u P O J IQOGON SNId http www ravar net Page 8 of 15 Version 1 0 Ravar Pty Ltd pp USBMOD4 User s Manual Driver Installation Your first choice when using the USBMODA 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 USBMOD4 will appear in the System Properties Device Manager as an USB Serial Port COMn as follows SYSTEM PROPERTIES Monitors Hy Mouse E9 Network adapters oy Ports COM amp LPT A d Communications Port COM1 E Communications Port COM2 Y ECP Printer Port LPT1 A Printer Port LPT 2 F USB Serial Port COM3 The Com Port number will vary depending on the number of existing Com Ports on your computer and the number of USBMOD4 s connected to your system To install the Virtual Com Port drivers download the driver from our website or the ftdichip com website and unzip the files to a local directory Then connect the USBMODA and windows will automatically ask for the driver Select to specify a location and b2. F829IOId D Sursnfaaquy oupUayrg uogpoiddy AOW ISA FGOWSSn 40u2 uv sjuasaidai xog poumo ay JAUADADA MMM P17 d AVA VA Z007 1HOINAd0O SNId WINdOW http www ravar net Page 11 of 15 Version 1 0 Ravar Pty Ltd pp USBMOD4 User s Manual Absolute Maximum Ratings Storage lempetst fe z exer seo vedo rb einsi pF Tex ERE Eee EEEE 65 C to 150 C Ambient Temperature Power Applied 0 C to 70 C VOC Supply Voltage riseire ea sa REP Ceu ERO X vee EPA ESPERE ETE 0 5v to 6 00v DC Input Voltage Inputs 0 5v to VCC 0 5v DC Input Voltage High Impedance Bidirectionals 0 5v to VCC 0 5v DC Output Current Outputs 24mA DC Output Current Low Impedance Bidirectionals 24mA Power Dissipation S oe aa d Rad dude OER CREET REE 500mW Electrostatic Discharge Voltage 2000V Latch Up Current Vi lt 0 or Vi gt Vcc 100mA DC Characteristics Ambient Temperature 0 C 70 C Operating Voltage and Current
3. Parameter Description Min Typ Max Units Conditions vest Y Operating puppi aa axo os y Voltage VIO Operating Vcc2 Supply Voltage 3 0 5 25 V Iccl Oe upp 25 mA Normal Operation Current Icc2 Operae BUDE 100 200 uA USB Suspend Current FIFO Data Control Bus I O Pin Characteristics VIO 5V Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 4 4 4 9 V I source 2 mA Vol Output Voltage Low 0 1 0 7 V I sink 2 4 mA Vin Input Switching 1 1 1 5 1 8 V Note 1 Threshold VHys Input Switching 200 mV Hysteresis Note 1 Inputs have an internal 200kQ pull up resistor to VIO RavarPty Ltd Version 1 0 Page 12 of 15 http www ravar net USBMOD4 User s Manual pp FIFO Data Control Bus I O Pin Characteristics VIO 3 3V Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 2 7 3 2 V Isource 2 mA Vol Output Voltage Low 0 1 0 7 V Isink 4 mA Input Switching Vin Threshold 1 0 1 4 1 8 V Note 1 VHys Input Switching 200 mV Hysteresis Note Inputs have an internal 200kQ pull up resistor to VIO RSTI ECS EDAT I O Pin Characteristics Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 4 4 4 9 V I source 2 mA Vol Output Voltage Low 0 1 0 7 V I sink 4 mA Input S
4. pr USBMOD4 User s Manual USBMODMA USB Plug and Play Parallel 8 Bit FIFO Development Module Second Generation The USBMODA shown in Diagram 1 is a second generation low cost integrated module for transferring data to from a peripheral and a host PC at up to 8 Million bits 1 Megabyte per second Based on the FTDI FT245BM USB FIFO Fast Parallel Data Transfer IC it s simple FIFO like design makes it easy to interface to a CPU MCU either by mapping the device into the memory I O map of the CPU using DMA or controlling the device via I O ports The USBMOD4 offers a complete plug and play solution making it ideal for rapid prototyping and development Diagram 1 MODULE FEATURES e Single module High Speed USB UART solution e No external passive components required e Based on the FTDI FT245BM USB FIFO Fast Parallel Data e Module powered from USB bus Transfer IC in addition to supplying up to 460mA for user application Integrated Type B USB Connector e 32 pin Dual In Line Package Ideal for prototyping e On board 6MHz Crystal e Fits into a standard 32 pin e External EEPROM for USB 600mil IC Socket enumeration data Ravar Pty Ltd Version 1 0 Page 1 of 15 http www ravar net USBMODMHA User s Manual pp FT245BM IC FEATURES Single Chip Multi Function Data Transfer Solution Send Receive Data over USB at up to 1 Mb Sec 384 byte receive buffer 128 byte transmit buffer for high data
5. 2514 Jackman Street Southport Southport Queensland 4215 Queensland 4215 Australia Australia Product Use Limitations Warranty and Quality Statement The USBMODA 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 USBMODA 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 USBMODA is a static sensitive device anti static procedures should be used in the handling of this device All USBMOD4 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 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
6. possibilities exist For instance it may be possible 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 ie 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 FT245BM can switch back into FIFO 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 FT245BM USB FIFO Fast Parallel Data Transfer IC please refer to the FT245BM Datasheet This datasheet can be found on the Ravar website at http www ravar net As mentioned above in module features the USBMODMA 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 USBMODA Rav
7. throughput Simple interface to CPU or MCU bus No in depth knowledge of USB required as all USB Protocol is handled automatically within the LC FTDI s Virtual COM port drivers eliminate the need for USB driver development in most cases Compact 32 pin 7mm x 7mm MQFP package Integrated 6Mhz 48Mhz Clock Multiplier aids FCC and CE compliance Integrated 3 3v Regulator No External Regulator Required ENHANCEMENTS e UHCI ORCI Compliant e USB 1 1 and USB 2 0 Compatible e USB VID PID Serial Number and Product Description Strings in external EZ2PROM VIRTUAL COM PORT VCP DRIVERS for e Windows 98 98 SE and ME Windows 2000 XP Windows CE MAC OS 8 and OS9 MAC OS X Linux 2 40 and greater In the planning or under development FTD2XX USB Direct Drivers DLL S W Interface e Windows 98 98 SE and ME e Windows 2000 XP This section summarises the enhancements of the 2nd generation device compared to its FT8U245AM predecessor For further details consult the device pin out description and functional descriptions RavarPty Ltd Version 1 0 Page 2 of 15 http www ravar net USBMODMHA User s Manual pp Integrated Power On Reset POR Circuit The device now incorporates an internal POR function The existing RESET pin RSTI on the module is maintained in order to allow external logic to reset the device where required however for many applications this pi
8. akeup SI WU signal The new Send Immediate WakeUp signal combines the two functions on a single pin If USB is in suspend mode and remote wakeup is enabled in the EEPROM strobing this pin low will cause the device to request a resume from suspend WakeUp on the USB Bus Normally this can be used to wake up the Host PC During normal operation if this pin is strobed low any data in the device RX buffer will be sent out over USB on the next Bulk IN request from the drivers regardless of the packet size This can be used to optimize USB transfer speed for some applications 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 Bit Bang Mode The 2nd generation device has a new option referred to as Bit Bang mode In Bit Bang mode the eight FIFO data lines can be switched between FIFO 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 an internal timer equivalent to the prescaler of the FT232BM device 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
9. ar Pty Ltd Version 1 0 Page 4 of 15 http www ravar net pr USBMODMHA User s Manual USBMOD4 PINOUT PIN PIN 1 G 32 2 END D 31 3 B USB1 D 30 4 v GND D GND 29 s lecs LB D po 28 6 Di 27 7 D2 26 8 Hu D3 25 9 D4 24 10 D5 23 11 Ul D 22 FT245B 12 D7 21 13 L 20 14 19 15 WR 4 2 AXF 16 GND www ravar net 17 USBMOD4 DIAGRAM 2 On the following page is the pin out table showing what the various pins are on the module RavarPtyLtd Version 1 0 Page 5 of 15 http www ravar net pp USBMOD4 User s Manual USBMOD4 PINOUT TABLE SIGNAL TYPE DESCRIPTION Device Ground Supply Pin Device Ground Supply Pin USB Bus Power Device 4 4 volt to 5 25 volt Power Supply Pin EEPROM Chip Select EEPROM Clock EEPROM Data I O Can be used by external device to reset chip If not required tie to VCC Enumeration Power connect to RSTO for bus powered operation or 3V3 to instruct PC to connect to device 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 RESET low will also force RSTOUT to go high impedance RSTOUT is NOT affected by a USB Bus Reset 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 It
10. cket size This can be used to optimize USB transfer speed for some applications Tie this pin high if not used Device Ground Supply Pin When high do not read data from FIFO When low there is data available in the FIFO which can be read by strobing RD low the high again When high do not write data into the FIFO When low data can be written into the FIFO by strobing WR high then low Writes the Data Byte on DO D7 into the Transmit FIFO Buffer when WR goes from high to low Enables Current FIFO Data Byte on DO D7 when low Fetches the next FIFO Data Byte if available from the Receive FIFO Buffer when RD goes from low to high Bi Directional Data Bus Bit 7 Bi Directional Data Bus Bit 6 Bi Directional Data Bus Bit 5 Bi Directional Data Bus Bit 4 Bi Directional Data Bus Bit 3 Bi Directional Data Bus Bit 2 Bi Directional Data Bus Bit 1 Bi Directional Data Bus Bit 0 Device Ground Supply Pin USB Data Signal Minus USB Data Signal Plus Device Ground Supply Pin The following page shows the schematic for the USBMOD4 Ravar Pty Ltd Version 1 0 Page 7 of 15 http www ravar net USBMOD4 User s Manual USBMOD4 SCHEMATIC wine JOUUDADA MMM PIT Ud YVA VM 200 IHOTMAdOO IOUS FAOW ISN aN NIVG V LVG A asn INOD pvag allway Iqa
11. ernal circuitry is bled to GND when power is removed thus ensuring that external circuitry controlled by PWREN resets reliably when power is restored PWREN can also be used be external circuitry to determine when USB is in suspend mode PWREN goes high Lower Suspend Current Integration of RCCLK within the device and internal design improvements reduce the suspend current of the FT245BM 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 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 bit in the EEPROM Programmable FIFO TX Buffer Timeout In the previous device the TX 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 RavarPty Ltd Version 1 0 Page 3 of 15 http www ravar net USBMOD4 User s Manual pp Send Immediate W
12. n can now be 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 a stable reset to external MCU and other devices RSTO was the TEST pin on the previous generation of devices 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 Integrated Level Converter on FIFO interface and control signals The previous devices would drive the FIFO 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 Power Management control for USB Bus Powered high current devices A 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 FIFO interface lines when the power is shut off PWREN is High In this mode any residual voltage on ext
13. product are subject to change and continual improvement RavarPty Ltd Version 1 0 Page 15 of 15 http www ravar net
14. rowse to the directory where you have unzipped the files Use the Non Plug amp Play driver for the USBMOD to avoid a delay identifying Ravar Pty Ltd Version 1 0 Page 9 of 15 http www ravar net pp USBMOD4 User s Manual Once the Virtual Com Port is installed it can be programmed exactly as 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 On the following pages there is a schematic drawing showing a sample application for the USBMOD4 The application shows how to interface the USBMOD4 to a micro controller We are using a PIC 16C84 in this application but any micro controller could be used if it has at least 2 Input Output ports In this application Port A is used for all the handshaking while Port B is used to transmit the data between the USBMOD4 and the PIC 16C84 Ravar Pty Ltd Version 1 0 Page 10 of 15 http www ravar net USBMOD4 User s Manual p 1 SAMPLE APPLICATION No Interfacing a PIC16C84
15. s 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 3 0 volt to 5 25 volt VCC to the FIFO 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 Device 4 4 volt to 5 25 volt Power Supply Pin 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 using the PEN pin in this way COYNE A Ny AIIN o RavarPtyLtd Version 1 0 Page 6 of 15 http www ravar net pp USBMOD4 User s Manual USBMOD4 PINOUT TABLE Continued SIGNAL TYPE DESCRIPTION The Send Immediate WakeUp signal combines two functions on a single pin If USB is in suspend mode PEN 1 and remote wakeup is enabled in the EEPROM strobing this pin low will cause the device to request a resume on the USB Bus Normally this can be used to wake up the Host PC During normal operation PEN 0 if this pin is strobed low any data in the device RX buffer will be sent out over USB on the next Bulk IN request from the drivers regardless of the pending pa
16. witching Vin Threshold 1 1 1 5 1 8 V Note 2 VHys Input Switching 200 mV Hysteresis Note 2 ECS and EDAT pins have an internal 200kQ pull up resistor to V RSTO Pin Characteristics Parameter Description Min Typ Max Units Conditions Voh Output Voltage High 3 0 3 6 V I source 2 mA lol Leakage Current Tri _ p 5 State RavarPty Ltd Version 1 0 Page 13 of 15 http www ravar net USBMODMHA User s Manual pp USB I O Pin Characteristics Parameter Description Min Typ Max Units Conditions RI 1 5kU to I O Pins Static 3V3Out D RI Uyon Output High S s 15kU to GND D RI 1 5kU to I O Pin Static 3V3Out D RI wwe Output Low E I Wd Y 15kU to GND D Single Ended RX UVse Threshold 0 8 2 0 V Differential UCom Ce een Mode 0 8 2 5 V UVDif Differential Input 02 V Sensitivity UDEZ 10e Output 29 44 ohm Note3 Impedance Note 3 Driver Output Impedance includes the external 27U series resistors on D and D pins Ravar Pty Ltd Version 1 0 Page 14 of 15 http www ravar net pp USBMOD4 User s Manual Technical Support and Further Information For any questions relating to the USBMODMA 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
Download Pdf Manuals
Related Search