MMusb232 User`s manual
MMusb232 User’s manual REV 1.0 u rd ST, ta- rve l a oa , S e Ev B VR ers b S l d n io 1, A trol We mo t i a ‘5 in ron ed r c fo cro dd s M the e s d e i m mb oar rs, peC E B e S PI its ng roll gh r K pi nt Hi fo r y o rte tot roc FID ers s o c r Pr mi s, R mm lle rs or ler gra tro f ol n o s pr oco CB e nt r l P r r u o o c tem ic s, t m m ds f s e y n S T ste ar lS n I , sy Bo tro C d I r n n e P so atio oco eb , e R c W r u AV pro val mic ed iro E dd ic ng PIC be ds m M ni T, m r , ig , S s E oa rs s e B t de VR Ki ng roll h t i r , A rte typ on Hig 1 c ‘5 Sta oto ro ID r e ic F rs P le rs or m s, R mm ve s f ller gra ntrl r Se ule tro pro oco r s, od on s m t c tem mic em i n ne s T st y S y r ohe In S C, r s B t e d PI eso tion ice , e R oc ua m Sp AV opr val IC e r r fo ic g E T, P mb E rs s M nin , S s ing r ig t R i e l ol des , AV er K typ B `51 tart roto roS s P mic , PC for s s ller er for lers d l ar tro erw les tro on b S du con ram c ro We imo et rog o n p n ed Mi her m roc d d ds et ste ic ar rs, Sy T m r o B olle In , S so tr ed IC oce ign P s co Spe R, opr De V cr B Rion h t ig r A Mi PC lua H f o rs , s oneasolution e Many ideas s er roll em Ev ds m nt st ng oar y o c S ni B Introduction MMusb232 is low-cost integrated module for data transmission via USB interface. It is based on FTDI`s FT232BM device. MMusb232 module can work with 1Mboud/s (RS232), 3Mboud/s (RS422/RS485, TTL) data transfer speed. It’s simply device witch represents interface between USB and Asynchronous Serial Data Transfer. There is USB cable attached to module. Windows drivers allows emulate serial port on PC and that provides to upgrade applications. Choosing our Minimodule is the first step for projects, which should be done in the short time. MMusb232 could be used as part of prototype eliminating necessity of designing circuit board and final circuit in which module is fitted like “sandwich shape”. MMusb232 is made in two-layer printed circuit board technology with a solid ground plane. Module includes an integral 93C46 EEPROM on board which is programmable via USB. All signals are drive via 24 pin, 1.1 in wide footprint. Integral power control makes the MMusb232 a perfect choice for USB bus-powered, high power designs as well as self- and low-powered products. We wish you were successful at designing and using new devices Features Summary • • • • • • • • • • • • • • • • • • • • • • • • Single on-board Chip USB - Asynchronous Serial Data Transfer Full Handshaking & Modem Interface Signals UART I/F Supports 7 / 8 Bit Data, 1 / 2 Stop Bits and Odd/Even/Mark/Space/No Parity Data rate 300 => 3M Baud (TTL) Data rate 300 => 1M Baud (RS232) Data rate 300 => 3M Baud (RS422/RS485) 384 Byte Receive Buffer / 128 Byte Transmit Buffer for high data throughput Adjustable RX buffer timeout Fully Assisted Hardware or X-On / X-Off Handshaking In-built support for event characters and line break condition Auto Transmit Buffer control for RS485 Support for USB Suspend / Resume through SLP and RI pins Support for high power USB Bus powered devices Integrated level converter on UART and control signals for interfacing to 5V and 3.3V logic Integrated 3.3V regulator for USB IO Integrated Power-On-Reset circuit 6MHZ resonator Integrated 6MHz – 48Mhz clock multiplier PLL USB Bulk or Isochronous data transfer modes 4.35V to 5.25V single supply operation UHCI / OHCI / EHCI host controller compatible USB 1.1 and USB 2.0 compatible USB VID, PID, Serial Number and Product Description strings in external EEPROM EEPROM programmable on-board via USB • • Standard USB connector, B type Two LEDs (RX, Tx) Virtual Com Port (VCP) drivers • Windows 98/ 98 SE / 2000 / ME / XP, MacOS, Linux 2.4 and greater D2XX (Direct Drivers + DLL S/W) • Windows 98 / 98 SE / 2000 / 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 General Description MMusb232 module is a USB interface that incorporates the functionality FT232BM into a single 24-pin module. A single USB port is converted to RS232 or RS422/RS485 interface, which allows communicating with greater speed.. By using FTDI’s virtual COM port drivers, the peripheral looks like a standard COM port to the application software. 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. MMusb232 Module Simplified Block Diagram 24-pin footprint USB B type FT232BM Control signals 8-bit 3.3V LDO Resonator 6MHz EEPROM Figure 1. MMusb232 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. Controller includes: • • • • • • • • • • • • • • • • • • • • • • • • Integrated Power-On-Reset Integrated Level Converter on UART interface and control signals Improved Power Management control for USB Bus Powered, high current devices Lower Suspend Current Support for USB Isochronous Transfers Programmable Receive Buffer Timeout Improved PreScaler Granularity Bit Bang Mode Extended EEPROM Support USB 2.0 (full speed option) Multiple Device Support without EEPROM 3.3V LDO Regulator USB Transceiver USB DPLL x8 Clock Multiplier Serial Interface Engine (SIE) USB Protocol Engine Dual Port TX Buffer (128 bytes) Dual Port RX Buffer (384 bytes) UART FIFO Controller UART Baud Rate Generator RESET Generator EEPROM Interface (More info: www.ftdichip.com) 4 EEPROM memory The on-board 93C46 EEPROM allows customize the USB VID, PID, Serial Number, Product Description Strings and Power Descriptor value of the MMusb232 for OEM applications. Other parameters controlled by the EEPROM include Remote Wake Up, Isochronous Transfer Mode. The EEPROM is programmable in-circuit via USB using a utility program available from FTDI’s web site (www.ftdichip.com) and www.propox.com Module Pin-Out Figure 2. Pin-Out Pin Definitions Pin 1 Pin’s name TXL mode Description 2 3 PCT PEN output (O.C.) input output LED Drive - Pulses Low when Transmitting Data via USB 4 5 TXE RI output input 6 7 8 9 10 11 DCD DSR DTR CTS RTS RXD input input input input output input Bus Powered – Tie Low / Self Powered – Tie High 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. Enable Transmit Data for RS485 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. Data Carrier Detect Control Input Data Set Ready Control Input / Handshake signal Data Terminal Ready Control Output / Handshake signal Clear To Send Control Input / Handshake signal Request To Send Control Output / Handshake signal Receive Asynchronous Data Input 5 12 15 TXD RST output input 16 RSO output 18 20 3V3 SLP output output 21 RXL 22 23 24 VIO VEX VPO Output (O.C.) input input output Transmit Asynchronous Data Output Can be used by an external device to reset the MMusb232. If not required, tie to VCC. Output of the internal Reset Generator. Stays high impedance for ~ 5ms after VCC > 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. Goes Low during USB Suspend Mode. Typically used to power-down an external TTL to RS232 level converter i.c. in USB <=> RS232 converter designs. LED Drive - Pulses Low when Receiving Data via USB +3.0 volt to +5.25 volt VCC to the UART interface pins Set main power supply, should be connect to VPO if powered from USB port Power supply from USB Technical Data Dimensions Weight Power supply : 45mm x 20mm x 15mm : ~ 60 g : 5V Mechanical Dimensions Dimensions are in miles. 1miles – 1/1000 inch 100miles = 2,54mm 6 Standard Device Configuration Examples USB Bus Powered and Self Powered Configuration Power supply 15 15 22 23 24 22 23 24 Figure 3a. USB Bus Powered Figure 3b. External Powered Figure 3a 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) 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 c) ~70mA 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 device can draw more that 500mA from the USB Bus. f) 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 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). If interface between MMusb232 and device must be 3.3v logic level, then 22 pin, should be connected to +3.3V voltage. 7 Bus powered circuit with power control – 5V power supply FT232BM Microcontroler VIO SLP VEX VPO Technical support If You have problem with MMusb232, please contact us at [email protected] 8 Schematic USBVCC FB1 FERRITE BEAD 1 EXTVCC 2 C1 10nF C3 10uF R1 470R PORTVCC DM DP USBDM 8 R8 See Table 5 27 X1 R6 See Table C9 6MHz 27p TEST FT232AM RESETO FT232 BM 28 4 C10 27p 31 32 1 2 RESET R12 See Table Table: Component value selector FT232AM R6 R7 R8 C8 R12 R14 0R 1k5 None 100nF 100k 100k FT232BM None None 1k5 0R None None 13 VCC TEST XTIN XTOUT RESET# RCCLK EECS EESK EEDATA TXD RXD RTS# CTS# DTR# DSR# DCD# RI# TXDEN USBEN PWRCTL TXLED# RXLED# USBVCC RCCLK VCC 3 USBDM 29 USBVCC USBDP GND 7 17 USBDP 3V3OUT GND R5 27R 30 6 R4 27R 9 R7 See Table AVCC J1 USB-B VCC C11 33nF 26 3V3OUT AGND 1 2 3 4 IOVCC USBVCC EECS EESK EEDATA R13 10k R15 2k2 TXD RXD RTS CTS DTR DSR DCD RI 16 15 14 12 11 TXDEN PWREN PWRCTL TXLED RXLED C5 C6 C7 0.1uF 0.1uF 0.1uF 0.1uF TXLED PWRCTL PWREN TxDEN RI DCD DSR DTR CTS RTS RxD TxD U2 FT232AM/BM USBVCC 1 2 3 4 U1 CS SK DIN DOUT VCC NC NC GND 8 7 6 5 1 2 3 4 5 6 7 8 9 10 11 12 J2 1 2 3 4 5 6 7 8 9 10 11 12 20 19 12 17 20 19 18 17 16 15 14 13 24 23 22 21 20 19 18 17 16 15 14 13 PORTVCC EXTVCC IOVCC RXLED SLEEP GND 3V3OUT GND RESETO RESET GND NONE DIP24 10 SLEEP SLEEP# R14 See Table C8 See Table 25 24 23 22 21 20 19 18 C4 D1 RXD D2 TXD R2 270R R3 270R J4 RxLEDEN J5 TxLEDEN IOVCC IOVCC 93C46 http://www.propox.com email: [email protected] Title: USB - SERIAL UART Interface Module Size: Date: 20-10-2002 9 Rev: File: Sheet 1 of 1 1.00
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This document provides examples of ways to connect the FT8U232AM or FT8U245AM devices for different power and reset configurations with explanations of areas where care needs to be taken.
The information contained in this document is provided to help debug designs which use FTDI's FT232BM or FT245BM devices and contains helpful tips on what to look for should your design fail to operate correctly.