MMBTA92LT1 datasheet(2/36 Pages) SILABS

Part #	MMBTA92LT1

Description	Evaluation Board Rev 5.0 for the Si2493/57/34/15/04

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Manufacturer	SILABS [Silicon Laboratories]

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Si2493/57/34/15/04

Global ISOmodem-EVB

2

Rev. 0.7

1. Si2493/57/34/15/04-EVB Setup and

Evaluation

This section explains how to set up the Si2493/57/34/

15/04-EVB for evaluation as an RS-232 or USB

interface modem. Jumper settings, power connection,

PC/terminal

connections,

and

terminal

program

configuration settings are given. The initial modem

setup after power is applied as well as a basic tutorial

on modem operation are provided. Si2493/57/34/15/04-

EVB configurations for evaluating additional features

are discussed separately. See the Si2493/57/34/15 or

Si2404 data sheets and “AN93: Si2493/57/34/15/04/04

Modem Designer’s Guide” for complete details.

1.1. Si2493/57/34/15/04-EVB Quick Start—

RS-232 Interface

1. Set jumpers according to Figure 1, but change J6 to the

arrangement shown in Figure 3 if an FS ISOmodem

package is used.

2. Connect:



DB-9 to PC COM 1 (with a pass-through cable).



RJ-11 to phone line or CO simulator.



9 V ac adaptor (or USB cable).

3. Bring up:



Turn on power to modem.



Autobaud automatically adjusts modem DTE speed and

protocol.

4. Type “AT” followed by a carriage return.



Should echo “AT” and then an “OK”.

1.2. Si2493/57/34/15/04-EVB Quick Start—

USB Interface

1. Set jumpers according to Figure 3, but change J6 to the

arrangement shown in Figure 3 if an FS ISOmodem

package is used.

2. Connect:



USB cable to PC



RJ-11 to phone line or CO simulator

3. Download USB driver for your operating system from the

CD supplied with the evaluation board.

4. Install driver.

5. Bring up.



Reset the modem.



Autobaud automatically adjusts modem DTE speed and

protocol.

6. Type “AT” followed by a carriage return.



Should echo “AT” and then an “OK”.

1.3. Motherboard and Daughter Card

Configuration

The EVB consist of a motherboard that takes a plug in

daughter card. The motherboard can be configured in a

variety of ways that are explained below and are

managed via jumpers. The daughter card contains both

the modem system side and the isolated line interface

(DAA).

The daughter card comes preconfigured and functional

although the user may decide to change some

operating options such as the type of crystal used with

the modem chip or the type of control signals used, i.e.

UART vs parallel. These features must be managed by

changing strapping

resistors soldered down to the

daughter card and by changing parts associated with

the crystal. These possible changes are explained

below.

1.3.1. Motherboard Configuration

Check all the jumper setting on the S2493/57/34/15/04-

EVB before applying power.

The standard factory

setting for the modem in a 24-pin FT package are

shown in the figure below. This setup configures the

modem for RS232 serial operation with autobaud

enabled. Any standard terminal program configured to

communicate through a PC com port can be used to

communicate with the EVB.

Figure 1 shows the default motherboard setup for the

FT package daughter card as well as the functions of

connectors and jumpers.

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