SI2401FS10-EVB Datasheet, PDF (2/32 Pages) Silicon Laboratories – Audio connector for call monitoring

Si2401FS10-EVB
1. Introduction
Notable differences between the Si2401 and other
ISOmodem products are highlighted in the bulleted list
below. For complete details and specifications, refer to
the current Si2401 data sheet.
Unique Si2401 Features:
 Many AT commands execute when entered without
<CR>.
 S-Register address and value are entered in hex
(example: ATS0F = 2B).
 Result codes are abbreviated (example: “O” instead
of “OK”).
 The Si2401DC power must be 3.3 V.
 Several AT commands are required to enable the
speaker:
ATSE2 = 80 configures GPIO4 for AOUT.
ATSF4 = 00 removes Tx and Rx audio mute.
ATM2 turns on speaker continuously.
 DTE interface default is 8N1, 2400 bps, hardware
flow control, and no linefeeds with carriage returns.
 ATDT is disabled if linefeeds with carriage returns
are enabled.
 Some common AT Commands are not available:
A/
ATD (must be ATDT or ATDP)
AT&Tn (use ATSE4=20 for local digital loopback)
Table 1. Modem Configuration Examples
Modulation
V22bis
V.22
V.21
Bell 212A
Bell 103
V.23 (1200 TX, 75 RX—Answer)
V.23 (75 TX, 1200 RX—Originate)
V.23 (600 TX, 75 RX—Answer)
V.23 (75 TX, 600 RX—Originate)
ATS07 =
06
02
03
00
01
14
24
10
20
Table 2. Modem Initialization Example
Command
Function
ATS00 = 02 Auto-answer after two rings
ATS07 = 06 Configures modem for V.22b
ATSF4 = 00 Removes audio mute
ATM1 Turns on speaker until carrier negotiated
2. Si2401FS10-EVB Setup and
Evaluation
This section explains how to set up the Si2401FS10-
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. After power is applied,
the initial modem setup and a basic tutorial on modem
operation are provided. The Si2401FS10-EVB
configurations for evaluating additional features are
discussed separately.
2.1. Si2401FS10-EVB Quick Start—RS-232
Interface
1. Set jumpers according to Figure 1.
2. Connect:
DB-9 to PC COM 1 (with a pass-through cable).
RJ-11 to phone line or test box.
the 9 V ac adaptor (or USB cable).
3. Bring up:
Turn on power to modem.
Set Terminal Program for 2400 bps 8N1.
Hardware flow control. Disable linefeeds with
carriage returns (linefeeds with carriage returns
disable ATDT commands.)
4. Type “AT” followed by a carriage return.
Should echo “AT” and then an “O”.
5. Type:
ATS00 = 01 for auto-answer on first ring.
2.2. Si2401 FS10-EVB Quick Start—USB
Interface
1. Set jumpers according to Figure 2.
2. Connect:
USB cable to PC.
RJ-11 to phone line or test box.
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.
Set Terminal Program for 2400 bps 8N1.
Hardware flow control. Disable linefeeds with
carriage returns (linefeeds with carriage returns
disable ATDT commands).
6. Type “AT” followed by a carriage return.
Should echo “AT” and then an “O”.
7. Type:
ATS00=01 for auto-answer on first ring.
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Rev. 1.1