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PDF EM200 Data sheet ( Hoja de datos )
| Número de pieza | EM200 | |
| Descripción | Ethernet Module | |
| Fabricantes | Tibbo Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EM200 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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EM200 Ethernet Module
The EM200 is an Ethernet Module for onboard installation. Module hardware includes
one 100BaseT Ethernet port (standard Ethernet magnetics are NOT integrated into
the Module), one serial port (CMOS-level) with a number of additional general-
purpose I/O lines, and an internal processor, whose firmware acts as a bridge
between the Ethernet and serial ports. Ethernet "side" of the Module connects
directly to a standard Ethernet magnetics circuit (such as YCL-PH163112) or RJ45
connector with integrated magnetics. Serial "side" interfaces directly to the serial
port pins of most microcontrollers, microprocessors, UARTs, etc.
From the hardware standpoint, the EM200 can be viewed as a universal platform
suitable for running a variety of network and serial communications-related
applications. It is the application firmware, not hardware that gives the EM200 most
of its functionality.
The Application firmware EM200 is supplied with, currently in its 3rd generation
("Release3"), turns the EM200 into a Serial Device Server used to connect serial
devices to the Ethernet (TCP/IP) networks.
The application firmware of the EM200 can be upgraded through the module's serial
port or Ethernet port. Serial upgrades are facilitated by a so-called Monitor- a fixed
"service" firmware inside the EM200. The Monitor cannot be upgraded. Network
upgrades rely on the application firmware itself- there is a self upgrade algorithm
that will be detailed later.
Since most of the EM200's operation is defined by its firmware the major part of the
EM200's functional description can be found in the
Device Server Application Firmware Manual. This EM200 Ethernet Module Manual
focuses on the hardware portion of the EM200.
©2000-2004 Tibbo Technology Inc.
1 page  
27 Tibbo Document System
Power, reset, and mode selection lines
#13
#14
#23
#24
VCC
GND
RST
MD (MD)
Input
Input
Positive power input, 5V nominal, +/- 5%, app. 220mA
Ground
Reset, active high
Mode selection pin
Line functions defined by the application firmware are shown in blue
The EM200 should be powered from a stabilized DS power supply with output
nominal voltage of 5V (+/- 5% tolerance). Current consumption of the EM200 is
approximately 220mA (in 100BaseT mode).
Proper external reset is a must! Reset pulse should be an active HIGH. We strongly
advise against using low-cost RC-networks and other unreliable methods of
generating reset pulse. Reset should be applied for as long as the power supply
voltage is below 4.6V. We recommend using a dedicated reset IC with brownout
detection, such as MAX810. Reset pulse length should be no less than 50ms,
counting from the moment the power supply voltage exceeds 4.6V.
If the EM200 is used to serve as a communications co-processor in a larger system
that has its own CPU it is also OK to control the RST line of the EM200 through a
general-purpose I/O pin of the "host" microcontroller. I/O pins of many
microcontrollers default to HIGH after the powerup and this means that the reset
will be applied to the EM200 at the same time when the host microcontroller is
reset. All the host microcontroller has to do is release the EM200 from reset at an
appropriate time by switching the state of the I/O line to LOW.
The MD line of the EM200 is used to select the operating mode of the EM200 and/or
its application firmware. The reason why the pin name is shown as MD(MD) is
because the functionality of this pin is in part hardwired and in part depends on the
application firmware:
· Hardwired functionality. When the EM200 powers up it verifies the state of the
MD input. If the MD input is at HIGH the EM200 proceeds to verifying and running
the application firmware loaded into its internal FLASH memory. If the MD input is
at LOW the EM200 enters the serial upgrade mode. For more information see
Monitor.
· Application firmware-dependent functionality. When the application firmware
is already running the MD line is typically used to make the EM200 enter the serial
programming mode. For more information see serial programming.
When the EM200 is used as a co-processor in a host system the MD line can be also
controlled by the host microcontroller. Ability to control both the RST and DS lines
allows the host microcontroller to switch between the operating modes of the
EM200.
©2000-2004 Tibbo Technology Inc.
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet EM200.PDF ] | |
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