USBMOD4

USBMOD4 Datasheet USBMOD4 - USB Plug and Play Parallel 8-Bit FIFO Development Module (Second Generation) The USBMOD4 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 • Single module High-Speed USB FIFO solution • No external passive components required • Based on the FTDI FT245BM USB FIFO – Fast Parallel Data Transfer IC • Module powered from USB bus in addition to supplying up to 460mA for user application • Integrated Type-B USB Connector • On-board 6MHz Crystal • External EEPROM for USB enumeration data • 32-pin Dual In-Line Package (Ideal for prototyping) • Fits into a standard 32-pin 600mil IC Socket Elexol Pty Ltd Version 1.1 Page 1 http://www.elexol.com USBMOD4 Datasheet FT245BM IC FEATURES • Single Chip Multi-Function Data Transfer Solution • Integrated 3.3v Regulator – No External Regulator Required • Send / Receive Data over USB at up to 1 Mb / Sec • UHCI / OHCI Compliant • USB 1.1 and USB 2.0 Compatible • 384 byte receive buffer / 128 byte transmit buffer for high data throughput • USB VID, PID, Serial Number and Product Description Strings in external E2PROM. VIRTUAL COM PORT (VCP) DRIVERS for • 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) • Windows 98, 98 SE and ME • Windows 2000 / XP • Simple interface to CPU or MCU bus • No in-depth knowledge of USB required as all USB Protocol is handled automatically within the I.C • 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 ENHANCEMENTS 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. • 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 pin 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 Elexol Pty Ltd Version 1.1 Page 2 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 http://www.elexol.com USBMOD4 Datasheet 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 external 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 Elexol Pty Ltd Version 1.1 Page 3 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 16ms timeout. This timeout is now programmable over USB in 1ms increments from 1ms to 255ms thus allowing the device to be better optimised for protocols requiring faster response times from short data packets. • Send Immediate / Wakeup (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 http://www.elexol.com USBMOD4 Datasheet 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 standalone as a general-purpose IO controller for example controlling lights, relays and switches, some other interesting 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 (i.e. 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 Elexol website at http://www.elexol.com As mentioned above in module features, the USBMOD4 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 USBMOD4. USBMOD4 PINOUT DIAGRAM 2 On the following page is the pin out table showing what the various pins are on the module. Elexol Pty Ltd Version 1.1 Page 4 http://www.elexol.com USBMOD4 Datasheet USBMOD4 PINOUT TABLE PIN # 1 2 3 4 5 6 7 8 9 10 SIGNAL G GND B+ +V ECS ECLK EDAT RSTI EP* RSTO TYPE PWR PWR PWR PWR I/O I/O OUT IN IN OUT DESCRIPTION Device – Ground Supply Pin Device – Ground Supply Pin USB Bus Power Device - +4.4 volt to +5.25 volt Power Supply Pin NOTE: No external voltage is required when Bus Powered 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 Output of the internal Reset Generator. Stays high impedance for ~2ms after VCC >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 is 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 ( Vcc) ………………………… -65°C to + 150°C 0°C to + 70°C -0.5v to +6.00v -0.5v to VCC + 0.5v -0.5v to VCC + 0.5v 24mA 24mA 500mW +/- 2000V 100mA DC Characteristics (Ambient Temperature = 0°C .. 70°C) Operating Voltage and Current Parameter Vcc1 Vcc2 Icc1 Icc2 Description +V Operating Supply Voltage VIO Operating Supply Voltage Operating Supply Current Operating Supply Current Min 4.4 3.0 Typ 5.0 25 100 Max 5.25 5.25 200 Units V V mA uA Normal Operation USB Suspend Conditions FIFO Data / Control Bus I/O Pin Characteristics (VIO = 5V) Parameter Voh Vol Vin VHys Description Min Typ Max Units Conditions Output Voltage High 4.4 4.9 V I source = 2 mA Output Voltage Low 0.1 0.7 V I sink = 4 mA Input Switching 1.1 1.5 1.8 V * Note 1 Threshold Input Switching 200 mV Hysteresis * Note 1 – Inputs have an internal 200kΩ pull-up resistor to VIO FIFO Data / Control Bus I/O Pin Characteristics (VIO = 3.3V) Parameter Voh Vol Vin VHys Description Min Typ Max Units Conditions Output Voltage High 2.7 3.2 V I source = 2 mA Output Voltage Low 0.1 0.7 V I sink = 4 mA Input Switching 1.0 1.4 1.8 V * Note 1 Threshold Input Switching 200 mV Hysteresis * Note 1 – Inputs have an internal 200kΩ pull-up resistor to VIO Elexol Pty Ltd Version 1.1 Page 10 http://www.elexol.com USBMOD4 Datasheet RSTI, ECS, EDAT I/O Pin Characteristics Parameter Voh Vol Vin VHys Description Output Voltage High Output Voltage Low Input Switching Threshold Input Switching Hysteresis Min 4.4 0.1 1.1 Typ 1.5 200 Max 4.9 0.7 1.8 Units V V V mV Conditions I source = 2 mA I sink = 4 mA * Note 2 * Note 2 – ECS and EDAT pins have an internal 200kΩ pull-up resistor to +V RSTO Pin Characteristics Parameter Voh Iol Description Output Voltage High Leakage Current TriState Min 3.0 Typ Max 3.6 5 Units V uA Conditions I source = 2 mA USB I/O Pin Characteristics Parameter UVoh Description I/O Pins Static Output (High) I/O Pin Static Output (Low) Single Ended RX Threshold Differential Common Mode Differential Input Sensitivity Driver Output Impedance Min 4.4 Typ Max 4.9 Units V Conditions Rl = 1.5kΩ to 3V3Out (D+) Rl = 15kΩ to GND (D+) Rl = 1.5kΩ to 3V3Out (D+) Rl = 15kΩ to GND (D+) UVol UVse UCom UVDif UDrvZ 0.1 0.8 0.8 0.2 29 - 0.7 2.0 2.5 V V V V 44 Ω (ohm) * Note 3 * Note 3 – Driver Output Impedance includes the external 27Ω series resistors on D+ and D- pins. Elexol Pty Ltd Version 1.1 Page 11 http://www.elexol.com USBMOD4 Datasheet Technical Support and Further Information For any questions relating to the USBMOD4 please contact us by Email, Fax or Phone. Email: support@elexol.com Ph: +61 755 743988 Fax: +61 755 743833 Elexol Pty Ltd Level 2 Commerce Centre 146 Bundall Road, Bundall Queensland 4217 Australia Elexol Pty Ltd PO Box 5972 GCMC Queensland 9726 Australia Product Use Limitations, Warranty and Quality Statement. The USBMOD4 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 USBMOD4 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 USBMOD4 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. Elexol 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. Elexol 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. Elexol Pty Ltd Version 1.1 Page 12 http://www.elexol.com