Download MMusb2232 User`s Manual

MMusb2232
User’s
Manual
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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 93C56 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
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Single board, USB Dual Channel Serial / Parallel Ports with a variety of configurations
Entire USB protocol handled on-board. No USB-specific firmware programming required
UART interface option with full Handshaking & 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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USB 2.0 Full Speed (12 Mbits / Second) compatible
4 diodes LED which signalize transmission on lines TXD and RXD channel’s A and B
Standard 34-pin, 0.6in wide footprint
Virtual Com Port (VCP) drivers
• Windows 98 / 98 SE / 2000 / ME / XP
D2XX (Direct Drivers + DLL S/W)
• Windows 98 / 98 SE / 2000 / ME / XP
Application areas
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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 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.
3
MMusb2232 Module Simplified Block Diagram
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
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 XOn/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 controlled 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.
4
Module Pin-Out
Figure 2. Pin-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
mode.
Pin#
31
2
Signal
/on module
RESET
/RST
EXTVCC
/EXTV
Type
Description
Input
Can be used by an external device to reset the
FT2232C. If not required, can be left disconnected.
+4.35 to +5.25 volt VCC to the device core, LDO and
non-UART / FIFO controller interface pins.
Device Analog Power Supply for the internal x8 clock
multiplier.
+3.0 to +5.25 volt VCC to the UART/FIFO Channel A
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.
Power from USB port. Connect to EXTVCC if module is
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.
Output signal 3.3V
Input
4
IOVCC
/IOV
PWR
1
PORTVCC
/PORT
PWR
3
3V3OUT
/3V3O
PWR
5
1
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16
7B
Definitions by Chip Mode .
Pin#
Pin
Name
/on module
18
ADBUS0/AD0
Pin Definitions by Chip Mode (2)
232
UART
Mode
245
FIFO
Mode
CPU
FIFO
Interface
Mode
Enhanced
Asynchronous
and
Synchronous
Bit-Bang
Modes
MPSSE
(4)
MCU
Host Bus
Enumeration
Mode
(5)
Fast
OptoIsolated
Serial
Mode
TXD
D0
D0
D0
TCK/SK
AD0
(3)
6
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. BitBang mode is not available on Channel B when Fast Opto-Isolated Serial Mode is enabled.
Technical Parameters
Dimensions
Weight
Power supply
Power dissipation
: 46,16 x 31,8 x 19,63 mm
: about 70 g
: 5V
: 500mW
Mechanical Dimensions
Dimensions are in miles.
1miles – 1/1000 inch
100miles = 2,54mm
7
Standard Device Configuration Examples
USB Bus Powered and Self Powered Configuration
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 ~200uA 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 device 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 speed device to USB. When the USB Host
8
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 to the FT2232C, so they will gently pull high unless
driven by some external logic.
Interfacing to Microcontrollers
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.
9
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 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 SI/WUx 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 SI/WUx pins are not being 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 SI/WUx 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 [email protected].
10
USBVCC
IOVCC
2
C1
10nF
C3
100nF
C5
10uF
2
EXTVCC
Schematic
FB1
FERRITE BEAD
1
FB2
FERRITE BEAD
C6
1
100n
C7
ADBUS0
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
SI/WUA
RESET
PWREN#
GND
GND
33nF
C2
R1
470R
10nF
46
C8
3
33nF
R4 27R
8
7
AVCC
3V3OUT
47p
3V3OUT
USBDM
USBDP
4
43
R?
47k
USBVCC
X1
44
6MHz
C10
47p
48
1
C11
47p
2
RESET#
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
XTIN
XTOUT
EECS
EESK
EEDATA
TEST
45
47
RSTOUT#
GND
GND
GND
GND
5
RESET
ADBUS0
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
SI/WUA
R3 27R
R2 1k5
AGND
DP
VCC
VCC
VCC-OA
VCC-OB
DM
BCBUS0
BCBUS1
BCBUS2
BCBUS3
SI/WUB
PWREN#
24
23
22
21
20
19
17
16
ADBUS0
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
15
13
12
11
10
ACBUS0
ACBUS1
ACBUS2
ACBUS3
SI/WUA
40
39
38
37
36
35
33
32
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
30
29
28
27
26
BCBUS0
BCBUS1
BCBUS2
BCBUS3
SI/WUB
41 PWREN#
U2
FT2232C
9
18
25
34
J5
USB-B
C9
3
42
14
31
C4
100nF
PORTVCC
1
2
3
4
JP1
JP2
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
PORTVCC
EXTVCC
3V3OUT
IOVCC
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
SI/WUB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
HEADER 17
HEADER 17
USBVCC
D1
LED
ACBUS2
J1
D2
LED
D3
LED
D4
LED
R5 220R
RxLEDA#
ACBUS3
J2
R6 220R
TXLEDA#
USBVCC
EECS
USBVCC
EESK
EEDATA
R9
10k
R10
2k2
1
2
3
4
CS
SK
DIN
DOUT
BCBUS2
J3
R7 220R
RXLEDB#
U1
VCC
NC
NC
GND
8
7
6
5
BCBUS3
J4
R8 220R
TXLEDB#
93C46
http://www.propox.com
email: [email protected]
11
Title: USB - UART/FIFO Interface Module
Size:
Rev:
File:
Date: 27-10-2004
Sheet 1 of 1
1.00