MMusb232RL User`s manual
Contents
1.2. MMusb232RL User s manual REV 1 0 Introduction MMusb232RL is a low cost integrated module for data transmission via USB interface It is based on FTDI s FT232RL device Mmusb232RL module can work with 1Mboud s RS232 3Mboud s RS422 RS485 TTL data transfer speed It s simple device which represents an interface between USB and Asynchronous Serial Data Transfer There is a USB cable attached to the module Windows drivers allow to emulate a serial port on the PC and that provides for upgrading applications Choosing our Minimodule is the first step for projects which should be done in a short time MMusb232 could be used as a part of a prototype eliminating the necessity of designing circuit board and final circuit which module is fitted sandwichlike on top MMusb232RL is made in two layer printed circuit board technology with a solid ground plane All signals are accessible via 24 pins in a 100mils raster 2 54 mm which allows to use this module with prototype PCBs Integral power control makes the MMusb232RL a perfect choice for USB bus powered high power designs as well as self and low powered products We wish you much success in designing and using new devices Features Summary Single on board Chip USB Asynchronous Serial Data Transfer USB data transmission speed from 300 bod s to 3Mbod s RS422 RS485 TTL level and up to 1 Mbod s RS232 Integrated USB protocol on FT232RL Full Handshaking a
3. volt VCC to the UART interface pins 2 1 2 3 input Set main power supply should be connect to VPO if powered from USB port 4 2 VPO output Power supply from USB Jumpers Figure 3 Musb232RL jumpers view top layer D 1 Description VEX i VPO pins VEX VIO 3V3 pins Technical Data Dimensions 45mm x 20mm x 15mm Weight 60g Power supply 5V Additional 5 pins have been placed on the board for power supply configuration VEX and VPO connected cause supplying from USB Last 3 pins are used for voltage level establishing 3 3V VIO 3V3 or 5V VIO VEX Mechanical Dimensions 75077 OF O5 O2 OF Of OZ OF OZ OF OF OF Dimensions are in mils 1mil 1 1000 inch 100mils 2 54mm Standard Device Configuration Examples USB Bus Powered jumpers configuration red Figure 4 Mmusb232RL USB bus powered Figure 4 illustrates 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 A High Power USB Bus Powered Device one that draws more than 100 should use the on board MOSFET to keep the current drawn by external circuitry to below 70 on plug in and 200uA on USB suspend d A device that consumes more than 100mA can not be plugged into a USB e No devic
4. G software Individual polarization setting for the RS232 lines Built in clock signal generator which can be connected to peripheral devices Unique Identification Number FTDIChip ID Bit bang mode implemented advanced asynchronous with two strobes synchronous and asynchronous using 4 CBUS lines which definitley increase application capabilities The device operating supply current has been reduced to 15mA VCC 3 3V 5V 0 ME XP Linux Application Areas USB to RS232 RS422 RS485 converters Upgrading RS232 Legacy Peripherals to USB Cellular and Cordless Phone USB data transfer cables and interfaces Interfacing MCU based designs to USB USB Audio and Low Bandwidth Video data transfer PDA USB data transfer USB Smart Card Readers Set Top Box S T B PC USB interface USB Hardware Modems USB Wireless Modems USB Instrumentation USB Bar Code Readers Audio Video transmission General Description MMusb232RL module is a USB interface that incorporates the functionality FT232BM into a single 24 pin module A single USB port is converted to 5232 or RS422 RS485 interface which allows communicating with greater speed By using FTDI s virtual COM port drivers the peripheral looks like a standard port to the application software Most of existing applications support VCP User must only change the ports used by software to ports created by the driver Using VCP the programmer can communicate with the device
5. e can draw more that 500mA from the USB Bus The USB power descriptor option in the EEPROM should be programmed to match the actual current intake External powered configuration RST GND Figure 5 Mmusb232RL external power supply Figure 5 illustrates a typical USB self powered configuration A USB Self Powered device gets its power from its own Power Supply and does not draw current from the USB bus 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 Bus powered circuit with power control 5V power supply ukt ad mi kkiego o 1urF startu CILJ He Mikrokontroler Figure 6 Mmusb232RL Bus powered circuit with power control 5V power supply In case of configuration as shown on figure 6 the jumpers are not necessary Figure 6 illustrates USB bus powered circuit configuration of Musb232RL External 5V devices can be powered from this module Basic rules for USB Self power devices are as follows a An external device must have own powe
6. erial Number Product Description Strings Power Descriptor value and CBO 4 lines configuration EEPROM is integrated with the FT232R and can be programmed using a utility program available from FTDI s web site www ftdichip com and www propox com Module Pin Out e ceo N C e Ce cez R e e OSR e e cts e RIS e RXD e TD CLJ Figure 2 Pin Definitions mode Description 1 input Configurable CBUS line default TXLED output 3 CB1 input Configurable CBUS line default RXLED output 4 CB2 input Configurable CBUS line default TXDEN output 5 RI input Ring Indicator Control Input When the Remote Wakeup option is enabled in the EEPROM taking RI low can be used to resume the PC USB Host controller from suspend 7 DSR input 11 RXD input 15 i RST input be used by an external device to reset the MMusb232 If not required tie to VCC 16 RSO output Output of the internal Reset Generator Stays high impedance for 5ms after VCC gt 3 5V and the internal clock starts up then clamps its output to the 3 3v output of the internal regulator Taking RESET low will also force RSTOUT to drive low RSTOUT is NOT affected by a USB Bus Reset 3 3 volt Output from the integrated L D O regulator 20 4 input Configurable CBUS line default SLEEP output CB3 input Configurable CBUS line default PWREN output 2 2 VIO input 3 0 volt to 5 25
7. mp Modem Interface Signals by hardware or I F Supports 7 8 Bit Data 1 2 Stop Bits and Odd Even Mark Space No Parity 384 Byte Receive Buffer 128 Byte Transmit Buffer for high data throughput Auto Transmit Buffer control for 5485 Support for USB Suspend Resume 5 configurable lines CBUS Integrated logical level converter 5V 1 8V Adjustable RX buffer timeout FTDI drivers available Built in clock signal generator 6 12 24 i 48MHz Integrated 1024bit internal EEPROM Bit bang mode advanced asynchronous with two strobes synchronous and asynchronous use 4 CBUS lines Support for bus powered self powered and high power bus powered USB configuratoins Integrated power on reset circuit with optional I O reset Integrated 3 3V regulator for USB IO Pwer supply from 3 3V to 5 25V Each circuit has its own unique ID FTDIChip ID feature UHCI OHCI EHCI host controller compatible e USB 2 0 compatible e Standard USB connector B type e Standard wide 24 pin DIP socket New Features FT232R is back compatible with FT232BM but most integrated FT232R doesn t need external cristal oscillator EEPROM and USB resistors It is not necessary to use separate power supply from the analog part It minimalizes the amount of needed elements in the module and makes the circuit most resistant to disturbances New Features 5 I O lines CBUSO 4 which functions are possible to set using free MPPRO
8. r on reset circuit b A Pull down option in internal EEeprom should be set on Suspend One of CBUS pins should be configured as PWREN in internal EEeprom and should be used for switching the supply to external circuits C For devices whitch take from USB more than 100mA current no device can draw more that 500mA from the USB Bus in internal EEeprom should be configured max power parameter which inform system of required power consumption Technical support If You have problem with MMusb232RL please contact us at support propox com Schematic VEX A VCC FERRITE BEAD 1 1 7 O 1uF 4 TuF 1 dee Header 2 Ul VIO 4 TXD 57 7010 TXD VCC RXD USBDM USB 1 3 RIS use FTDI CTS Hon 20 0 9 DSR FT232R 22 512 RESET E R NC CBUSO 27 a DRENG 5 OSCI 1 lt 5 osco CBUS2 ES 7 CBUS3 Kt x 2 2 3V30UT CBUS4 lt JP3 3V3 i VIO 0 luF g VEX E i Header 3 Many ideas one solution J2 CBO 1 4 2 3 CB2 4 CB3 RIS 5 4 __6 GND DSR 7 3V3 DIR 8 GND CIS amp 9 RSO RIS amp 10 5 RSTE RXD 11 GND TXD 12 NC DIP24 CBUSO J4 RxLEDEN 727 http www propox com email support propox com Many ideas one solution Title MMusb232RL Size File Date 01 07 2006
9. the same as by a regular PC COM port Commands to set the baud rate are ignored the device always transfers data at its fastest rate regardless of the application s baud rate setting Alternatively FTDI s D2XX drivers allow application software to access the device directly through a published DLL based API Virtual Com Port VCP drivers e Windows 98 98 SE 2000 ME XP MacOS Linux 2 4 and greater D2XX Direct Drivers DLL S W e Windows 98 98 SE 2000 ME XP Linux MMusb232RL Module Simplified Block Diagram FT232RL 12MHz rezonator 3 3V LDO Figure 1 MMusb232RL block diagram Functional Block Descriptions 12MHz Oscillator The 12MHz Oscillator cell generates a 12MHz reference clock input to the x4 Clock multiplier from an external 12MHz ceramic resonator Clock signal is used by SIE USB Protocol Engine and FIFO controller Controller includes e Integrated Power On Reset Integrated Level Converter on UART interface and control signals Improved Power Management control for USB Bus Powered high current devices USB Suspend Resume signals Lower Suspend Current Bit Bang Mode USB 2 0 full speed option 3 3V LDO Regulator Clock Multiplier Divider Serial Interface Engine SIE Dual Port TX Buffer 128 bytes Dual Port RX Buffer 384 bytes UART FIFO Controller Baud Rate Generator RESET Generator More info www ftdichip corm EEPROM memory The EEPROM allows customize the USB VID PID S
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