MMBTA92LT1 データシートの表示（PDF） - Silicon Laboratories
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MMBTA92LT1 Datasheet PDF : 36 Pages
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Si2493/57/34/15/04
Global ISOmodem-EVB
either side.
1.5. Terminal and Line Connections
The Si2493/57/34/15/04 can be tested as a standard
serial data modem by connecting the Si2493/57/34/15/
04-EVB to a personal computer or other data terminal
equipment (DTE), phone line, and power. Connect a PC
serial port to the DB9 connector on the Si2493/57/34/
15/04-EVB with a pass-through cable. The RS-232
transceivers on the EVB can communicate with the DTE
at rates up to 1 Mbps. Any standard terminal program,
such as HyperTerminal or ProComm, running on a PC
communicates with the Si2493/57/34/15/04-EVB. The
standard factory jumper configuration has autobaud
enabled. Autobaud detects the DTE speed, data length,
parity, and number of stop bits.
If JP33 is installed, autobaud is disabled. Configure the
terminal emulation program to 19200 bps, eight data
bits, no parity, one stop bit, and hardware (CTS)
handshaking. Connect the RJ-11 jack on the Si2493/57/
34/15/04-EVB to an analog phone line or telephone line
simulator, such as a Teltone TLS 5.
1.6. Making Connections
With the terminal program properly configured and
running, apply power to the Si2493/57/34/15/04-EVB.
Type “AT<cr>”, and the modem should return “OK”
indicating the modem is working in the command mode
and communicating with the terminal. If the “OK”
response is not received, try resetting the modem by
pressing the manual reset switch (S1); then, again type
“AT<cr>.” Next, type “ATI6<cr>.” The modem should
respond with “2493”, “2457”, “2434”, “2415”, or “2404”
indicating the terminal is communicating with an Si2493,
Si2457, Si2434, Si2415, or Si2404.
Type “ATS0=2<cr>” to configure the modem to answer
on the second ring.
To take the modem off-hook, type “ATH1<cr>.” The
modem should go to the off-hook state, draw loop
current, and respond with an “OK.” Next, type
“ATH<cr>” or “ATH0<cr>”, and the modem should hang
up (go on-hook) and stop drawing loop current.
To make a modem connection, type “ATDT(called
modem phone number)<cr>.” Once the connection is
established, a “CONNECT” message appears indicating
the two modems are in the data mode and
communicating. Typing on one terminal should appear
on the other terminal. To return to the command mode
without interrupting the connection between the two
modems, type “+++.” Approximately two seconds later,
“OK” appears. The modem is now in command mode
and accepts “AT” commands.Type “ATH” (or “ATH0”) to
terminate the data connection, or type “ATO” to return to
the data mode. After the ATO command, the modem
resumes the data connection and no longer accepts AT
commands.
1.7. EVB Part Numbers
The ISOmodem evaluation boards are offered in
multiple speeds and packaging options. The first four
numbers indicate the system-side device. The next two
letters indicate the system-side package (FS–Lead-free,
16-pin SOIC; FT–Lead-free, 24-pin TSSOP). The final
two numbers indicate the line-side device. See Figure 7.
Si2457-D-FS18-EVB
LS Part Number (Si30xx)
SS Package
SS Revision
SS Part Number
Figure 7. EVB Part Number Example
2. Si2493/57/34/15/04-EVB
Functional Description
The Si2493/57/34/15/04-EVB is a multipurpose
evaluation system. The modem daughter card
illustrates the small size and few components required
to implement an entire controller-based modem with
global compatibility. The daughter card can be used
independently of, or in conjunction with, the
motherboard. The motherboard adds features that
enhance the ease of evaluating the many capabilities of
the Si2493/57/34/15/04 ISOmodem®.
2.1. Motherboard
The motherboard provides a convenient interface to the
Si2493/57/34/15/04 DC (daughter card). The versatile
power supply allows for a wide range of ac and dc
voltages to power the board. RS-232 transceivers and a
DB9 connector allow the Si2493/57/34/15/04-EVB to be
easily connected to a PC or other terminal device.
Jumper options allow direct access to the LVCMOS/TTL
level serial inputs to the Si2493/57/34/15/04, bypassing
the RS-232 transceivers or USB interface. This is
particularly useful for directly connecting the Si2493/57/
34/15/04 to embedded systems.
The Si24xxURT-EVB motherboard connects to the
daughter card through two connectors, JP101 and JP2.
JP101 is an 8x2 header providing connection to all
Si2493/57/34/15/04 digital signals and regulated 3.3 V
power for the Si2493/57/34/15/04. The Si2493/57/34/
15/04 digital signals appearing at JP101 (daughter card
interface) are LVCMOS and TTL compatible. JP2 is a
4x1 socket providing connection between the daughter
8
Rev. 0.7
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