Silicon Laboratories Si2457 Bedienungsanleitung PDF herunterladen (Seite 3)

Si2493/57/34/15/04

Global ISOmodem-EVB

Rev. 0.7 3

RS232 com

port link to

Host

USB,

virtual com

port link to

Host (J11)

Insert JP33 & JP34

jumpers to enable

EEPROM

Insert jumper in

JP34 to run at a

fixed 19.2 kBaud

rate.

Remove JP12

Jumper to shut

down audio

power amp U27

Call progress

Speaker, and its

jumper JP14.

RS232 vs USB

select jumper,

JP23, with

RS232 select

shown.

(Remove to

disable both

modes).

AC/DC Pwr

Inputs: J8

or J9.

Speaker

Output,

JP11

RJ11

Tel. Line

connectors.

Tip and ring

signals available

at these test

points.

Modem daughter cards

mate with J101 & JP2.

(Daughter card versions

prior to rev. 2.0 will not fit

this motherboard.)

Tests points (+3.3V

and Isense) that allow

modem current o tbe

measured via the 1.0

Ohm shunt: R59.

System Connector.

Allows all modem

signals to be

probed or routed

elsewhere.

LEDs and test

points showing

status of all

control lines as

well as TX/RX

J6: Jumpers for control

line configuration.

Shown set up for a 24

pin modem on DC.

EEPROM

(U5)

Reset

Pushbutton

Audio Power

amp (U27)

Figure 1. Default Motherboard Setup

1 2 3 4 5 6 7 8 ... 36 37

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