MMusb2232 User`s Manual
Contents
1. B1 FERRITEBEAD Ce w 1 2 9 EXIVCC 4 Cl famam cs e 10nF 1001F T l0uF C6 2 IFERRITEBEAD t 1 100n c7 33nF a RI 470R T1 H 10nF o PORTVCC Tae 1 c alt a 2 i Sol 3 o a IS 4 4p TONE U lt a appuso ABY UBB 9 8856 23 ABU ci gt gt ADBUSI Z 88 22_ADBUS2 3 S ABU I ABU ll 3V30UT e ADBUS3 AIRISA gt R4 ZR 33nF ADBUss 19 ABUS 8 17 ALBUS6 USBDM ADBUS6 T Are ADBUS7 1 7_ use ACBUSo F ACBUSO AGUI Z AUS R2 1k5 RI TR 12 ACBUS2 5 ACBUS 11 ACBUS3 RSTOUT ACBUS3 T SANUA SUWUA RESET 4 REER Bppuso 40 BIBUSO BEW 3 BIBU R S xm BIBUS S ross lt if BIBUS PS reus 1k oe PB 33 BBWS c OME 48 mcs BDBUS 32 BIBUS7 USBVCC TR x sous 2 Best i 2 BOBUS 28 BOBLS2 FDATA BCBUS2 BCBUS3 27 BCBUSS 4 26 S WUB pepe fani lt 6566 rwmuw L U2 lelalz FT232C USBVCC UL 5 cs voc 5 Sk NC i DN NC DOUT GND J 93046 z i5 pas2sSpgygHNBUPDSERE HEADER 17 USBVCC o D2 D3 D4 XV IED X IED X7IED N S R n RS 220R ACBUS2 qj p RxLEDAs R6 220R ACBUS3 R7 220R BCBUS2 nu R8 220R BCBUS3 r b TXLEDB y 7 A d bitp Avww propax com Zu email support propox com Title USB UART HFO Interface Module Size File Date 27 10 2004 Sheet 1 of 1 Rev 1 00 oneuiauos2. e USB 2 0 Full Speed 12 Mbits Second compatible e 4diodes LED which signalize transmission on lines TXD and RXD channel s A and B e Standard 34 pin 0 6in wide footprint Virtual Com Port VCP drivers e Windows 98 98 SE 2000 ME XP D2XX Direct Drivers DLL S W e Windows 98 98 SE 2000 ME XP Application areas USB Dual Port RS2232 Converters USB Dual Port RS422 RS485 Upgrading Legacy Peripheral Designs USB Instrumentation USB JTAG Programming USB to SPI Bus Interfaces USB Industrial Control Field Upgradeable USB Products Galvanically Isolated Products with USB Interfaces Toys General Description The MMusb2232 module is a USB interface that incorporates the functionality of two chips FT232BM and FT245BM into a single 34 pin module A single downstream USB port is converted to two IO channels that can each be individually configured as UART interface or FIFO interface without the need to add a USB hub There are also several new modes which can be enabled in the external EEPROM or by using DLL driver commands These include Synchronous Bit Bang Mode a CPU Style FIFO Interface Mode a Multi Protocol Synchronous Serial Engine Interface Mode MCU Host Bus Emulation Mode and Fast Opto Isolated Serial Interface Mode Additionally a new high output drive level option means that the device UART FIFO IO pins will drive out at around three times the normal power level allowing the data bus to be shared
3. MMusb2232 User s Manual REV 1 0 Introduction MMusb2232 is low cost integrated module for data transmission via USB 2 0 Full Speed interface with maximum transfer 12 Mbit s It is based on FTDI s FT2232C device Module features two Multi Purpose UART FIFO controllers that can be configured individually in several modes In addition to the UART interface FIFO interface and Bit Bang I O modes of the second generation FT232BM and FT245BM devices the FT2232C offers a variety of additional modes of operation including a Multi Protocol Synchronous Serial Engine interface designed specifically for synchronous serial protocols such as JTAG and SPI bus MMusb2232 is made in two layer printed circuit board technology with a solid ground plane Module includes an integral 933C56 EEPROM on board which is programmable via USB All signals are drive via 34 pin 1 1 in wide footprint Integral power control makes the MMusb2232 a perfect choice for USB bus powered high power designs as well as self and low powered products Choosing our Minimodule is the first step for projects which should be done in the short time MMusb2232 could be used both prototype eliminating necessity of designing circuit board and final circuit in which module is fitted like sandwich shape We wish you were successful at designing and using new devices Features Summary ZA Fp Single board USB Dual Channel Serial Parallel Ports with a variety of c
4. Port RX and TX buffers and the UART FIFO transmit and receive registers When configured as a UART it performs asynchronous 7 8 bit parallel to serial and serial to parallel conversion of the data on the RS232 RS422 and RS485 interface Control signals supported by UART mode include RTS CTS DSR DTR DCD and RI There are also transmitter enable control signal pins TXDEN provided to assist with interfacing to RS485 transceivers RTS CTS DSR DTR and X On X Off handshaking options are also supported Handshaking where required is handled in hardware to ensure fast response times The UARTs also support the RS232 BREAK setting and detection conditions EEPROM Interface The on board 93C56 EEPROM allows each of the MMusb2232 module s channels to be independently configured as a serial UART 232 mode or a parallel FIFO 245 mode The EEPROM is used to enable the CPU style FIFO interface and Fast Opto Isolated Serial interface modes The EEPROM can also be used to customize the USB VID PID Serial Number Product Description Strings and Power Descriptor value of the MMusb2232 for OEM applications Other parameters controled by the EEPROM include Remote Wake Up Isochronous Transfer Mode Soft Pull Down on Power Off and USB 2 0 descriptor modes The EEPROM is programmable in circuit via USB using a utility program available from both FTDI s web site www ftdichip com and www propox com yr ion Module Pin Out Figure 2 P
5. Power dissipation 500mW Mechanical Dimensions 1817 N o N N n v J C Jm C 2 1252 Dimensions are in miles miles 1 1000 inch 100miles 2 2 54mm PE Many ideas one solution Standard Device Configuration Examples USB Bus Powered and Self Powered Configuration External 5U Supply NC Figure 3a USB Bus Powered Configuration Figure 3b Self Powered Configuration Figure 3a illustrates the MMusb2232 in a typical USB bus powered configuration A USB Bus Powered device gets its power from the USB bus Basic rules for USB Bus power devices are as follows a On plug in the device must draw no more than 100mA b On USB Suspend the device must draw no more than 500uA c A High Power USB Bus Powered Device one that draws more than 100mA should use the on board MOSFET to keep the current drawn by external circuitry to below 70mA on plug in and 200uUA on USB suspend d A device that consumes more than 100mA cannot be plugged into a USB Bus Powered Hub e No device can draw more that 500mA from the USB Bus The power descriptor in the EEPROM should be programmed to match the current draw required by the device A Ferrite Bead is connected in series with USB power to prevent noise from the device and associated circuitry EMI being radiated down the USB cable to the host Figure 3b illustrates the MMusb2232 in a typical USB self powered configuration A USB Self Powered dev
6. 5 CPU Enhanced MPSSE MCU Fast Name UART FIFO FIFO Asynchronous 4 Host Bus l Opto jen module Mode Mode Interface and Enumeration Isolated Mode Synchronous Mode Serial Bit Bang 5 Mode Modes 18 ADBUSO ADO TXD DO DO DO TCK SK ADO 3 Commentary 2 232 UART 245 FIFO CPU FIFO Interface and Fast Opto Isolated modes are enabled in the external EEPROM Enhanced Asynchronous and Synchronous Bit Bang modes MPSSE and MCU Host Bus Emulation modes are enabled using driver commands 3 Channel A can be configured in another IO mode if channel B is in Fast Opto Isolated Serial Mode If both Channel A and Channel B are in Fast Opto Isolated Serial Mode all of the IO will be on Channel B 4 MPSSE is Channel A only 5 MCU Host Bus Emulation requires both Channels 6 The Bit Bang Mode synchronous and asynchronous WR and RD strobes are on these pins when the main Channel mode is 245 FIFO CPU FIFO interface or Fast Opto Isolated Serial Modes 7 The Bit Bang Mode synchronous and asynchronous WR and RD strobes are on these pins when the main Channel mode is 232 UART Mode 8 The Bit Bang Mode synchronous and asynchronous WR and RD strobes are on these pins when the main Channel mode is 245 FIFO CPU FIFO interface Bit Bang mode is not available on Channel B when Fast Opto Isolated Serial Mode is enabled Technical Parameters Dimensions 46 16 x 31 8 x 19 68 mm Weight about 70 g Power supply 5V
7. by several devices Classic BM style Asynchronous Bit Bang Mode is also supported but has been enhanced to give the user access to the device s internal RD and WR strobes FTDI provides a royalty free Virtual Com Port VCP driver that makes the peripheral ports look like a standard COM port to the PC Most existing software applications should be able interface with the Virtual Com Port simply by reconfiguring them to use the new ports created by the driver Using the VCP drivers an application programmer would communicate with the device in exactly the same way as they would a regular PC COM port using the Windows VCOMM API calls or a COM port library The FT2232C driver also incorporates the functions defined for FTDI s D2XX drivers allowing applications programmers to interface software directly to the device using a Windows DLL yr ion MMusb2232 Module Simplified Block Diagram 3 3Uolt LDO FT2232C 34 Pin Header Channel A Multi purpose UART FIFO Controller Channel B Multi purpose UART FIFO Controller 6MHz Resonator 93C56 EEPROM Figure 1 MMusb2232 block diagram Functional Block Descriptions 6MHz Oscillator The 6MHz Oscillator cell generates a 6MHz reference clock input to the x8 Clock multiplier from an external 6MHz ceramic resonator Multi Purpose UART FIFO Controllers The Multi purpose UART FIFO controllers handle the transfer of data between the Dual
8. ch cases no special care need be taken to meet the USB suspend current 0 5 mA as the device does not get it s power from the USB port Note that if the SIAWUXx pins are not being used they should be pulled up to the same supply as their respective VCCIOx pin USB Bus Powered 3 3V Systems Figure 4c shows how to configure the MMusb2232 to interface with a 3 3V microcontroller In this example a discrete 3 3V regulator is used to supply the 3 3V logic from the USB supply VCCIOA and VCCIOB are connected to the output of the 3 3V regulator which in turn will cause the device interface IO pins on both channels to drive out at 3 3V level It is also possible to have one IO interface channel driving out at 5V level and the other at 3 3V level In this case one of the VCCIOx pins would be connected to 5V and the other connected to 3 3V For USB bus powered circuits care must be taken when selecting the regulator The regulator must be capable of sustaining its output voltage with an input voltage of 4 35 volts A Low Drop Out LDO regulator must be selected An example of a regulator family that meets these requirements is the MicroChip Telcom TC55 Series These devices can supply up to 250mA current Note It should be emphasized that the 3 3V supply for VCCIOx in a bus powered design with a 3 3V logic interface should come from an LDO that is supplied by the USB bus not from any other source Please also note that if the SIAWUXx pins are not bei
9. ice gets its power from its own power supply and does not draw current from the USB bus The basic rules for USB Self power devices are as follows a A Self Powered device should not force current down the USB bus when the USB Host or Hub Controller is powered down b A Self Powered device can take as much current as it likes during normal operation and USB suspend as it has its own power source C A Self Powered device can be used with any USB Host and both Bus and Self Powered USB Hubs The USB power descriptor option in the EEPROM should be programmed to a value of zero self powered To meet requirement a the 1 5K pull up resistor on USBDP is connected to RSTOUT as per the bus power circuit However the USB Bus Power is used to control the RESET Pin of the FT2232C device When the USB Host or Hub is powered up RSTOUT will pull the 1 5K resistor on USBDP to 3 3V thus identifying the device as a full soeed device to USB When the USB Host IREWO Many ideas one solution or Hub power is off RESET will go low and the device will be held in reset As RESET is low RSTOUT will also be low so no current will be forced down USBDP via the 1 5K pull up resistor when the host or hub is powered down Failure to do this may cause some USB host or hub controllers to power up erratically Note When the MMusb2232 is in reset the I O interface pins all go tri state These pins have 200K pull up resistors to VCCIOx internal t
10. in Out Pin Definitions This section describes the operation of the MMusb2232 pins Common pins are defined in the first section and the I O pins are defined by chip mode Common Pins The operations of the following MMusb2232 pins stay the same regardless of the operating N e N N a v J C p L o 2 mode Pin Signal Type Description on module 31 RESET Input Can be used by an external device to reset the RST FT2232C If not required can be left disconnected 2 EXTVCC Input 4 35 to 5 25 volt VCC to the device core LDO and EXTV non UART FIFO controller interface pins Device Analog Power Supply for the internal x8 clock multiplier 4 IOVCC PWR 3 0 to 5 25 volt VCC to the UART FIFO Channel A NOV interface pins When interfacing with 3 3V external logic connect VCCIO to the 3 3V supply of the external logic otherwise connect to VCC to drive out at 5V CMOS level 1 PORTVCC PWR Power from USB port Connect to EXTVCC if module is PORT to be powered by the USB port typical configuration 500mA maximum current available to USB adapter and target electronics if USB device is configured for high power 3 3V30UT PWR Output signal 3 3V 3V30 _ AR Pin Definitions by Chip Mode Pin Definitions by Chip Mode 2 ZA Fp 232 24
11. ng used they should be pulled up to the same supply as their respective VCCIOx pin USB Self Powered 3 3V Systems Figure 4d is an example of a MMusb2232 USB self powered design with 3 3V interface In this case the VCCIOA and VCCIOB pins are supplied by an external 3 3V supply in order to make both of the device s IO channels drive out at 3 3V logic level thus allowing them to be connected to a 3 3V microcontroller or other external logic It is also possible to have one IO interface channel driving out at 5V level and the other at 3 3V level In this case one of the VCCIOx pins would be connected to 5V and the other connected to 3 3V A USB self powered design uses its own power supplies and does not draw any of its power from the USB bus In such cases no special care need be taken to meet the USB suspend current 0 5 mA as the device does not get it s power from the USB port Note that if the SIAWUx pins are not being used they should be pulled up to the same supply as their respective VCCIOx pin Technical Support If You have problem with MMusb2232 please contact us at support 2propox com Pg 10 uonnjos auo seep Auei o FORLE LL
12. o the FT2232C so they will gently pull high unless driven by some external logic Interfacing to Microcontrollers External U Supply External Supply Microcontroller Microcontroller NC Figure 4a Figure 4b External 3 3U Supply External Microcontroller Supply Microcontroller NC Figure 4c Figure 4d USB Bus Powered 5V Systems Figure 4a shows how to configure the MMusb2232 to interface with a 5V microcontroller In this example the USB port is the power source for VCCIOA and VCCIOB which in turn will cause the device interface IO pins on both channels to drive out at the 5V level In this configuration must be on board MOSFET power switch controls power to the microcontroller Care must be taken to ensure all microcontroller circuitry when combined with the MMusb2232M circuitry does not exceed the maximum available current from the USB port of 500mA for a high powered USB device AROK Many ideas one solution USB Self Powered 5V Systems Figure 4b is an example of a MMusb2232 USB self powered design with 5V interface In this case the VCCIOA and VCCIOB pins are supplied by an external 5V supply in order to make both of the device s IO channels drive out at 5V logic level thus allowing them to be connected to a 5V microcontroller or other external logic A USB self powered design uses its own power supplies and does not draw any of its power from the USB bus In su
13. onfigurations Entire USB protocol handled on board No USB specific firmware programming required UART interface option with full Handshaking amp Modem interface signals UART Interface supports 7 8 bit data 1 2 stop bits and Odd Even Mark Space NoParity Transfer Data Rate 300 to 1 Mega Baud RS232 Transfer Data Rate 300 to 3 Mega Baud TTL and RS422 RS485 Auto Transmit Enable control for RS485 serial applications using TXDEN pin MMusb245 style FIFO interface option with bi directional data bus and simple 4 wire handshake interface Transfer Data Rate up to 1 MegaByte Second Enhanced Bit Bang Mode interface option New Synchronous Bit Bang Mode interface option New CPU Style FIFO Interface Mode option New Multi Protocol Synchronous Serial Engine MPSSE interface option New MCU Host Bus Emulation Mode option New Fast Opto Isolated Serial Interface Mode option Interface mode and USB Description strings configurable in on board EEPROM EEPROM Configurable in circuit via USB Support for USB Suspend and Resume conditions via PWREN and SI WUx pins Support for bus powered self powered and high power bus powered USB configurations Integrated Power On Reset circuit with optional Reset input and Reset Output pins 5V and 3 3V logic IO Interfacing with independent level conversion on each channel USB Bulk or Isochronous data transfer modes 4 35V to 5 25V single supply operating voltage range UHCI OHCI EHCI host controller compatible
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