MMusb232_en.pdf
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MMusb232
User’s
manual
REV 1.0
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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
Control
signals
FT232BM
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
Pin’s
name
mode
Description
1
TXL
output
(O.C.)
LED Drive - Pulses Low when Transmitting Data via USB
2
PCT
input
Bus Powered – Tie Low / Self Powered – Tie High
3
PEN
output
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.
4
TXE
output
Enable Transmit Data for RS485
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.
6
DCD
input
Data Carrier Detect Control Input
7
DSR
input
Data Set Ready Control Input / Handshake signal
8
DTR
input
Data Terminal Ready Control Output / Handshake signal
9
CTS
input
Clear To Send Control Input / Handshake signal
10
RTS
output
Request To Send Control Output / Handshake signal
11
RXD
input
Receive Asynchronous Data Input
12
TXD
output
Transmit Asynchronous Data Output
15
RST
input
Can be used by an external device to reset the MMusb232. If not required, tie
to VCC.
5
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