SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 138

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
3.5.19.5. 8 kV Surge
Use the reference design with through-hole Y1
capacitors for C1, C2, C8, and C9. Use spacing
between the capacitor leads, between any line-side
(high voltage) component or trace and system side (low
voltage) component or trace greater than 8 mm. Also,
the spacing between any line-side component or trace
(or through-hole lead extending through the PCB) and
the chassis (or anything connected to the chassis or low
voltage circuitry) must be greater than 8 mm or
protected
withstanding a voltage greater than 8 kV. Additionally,
slots cut through the PCB are recommended between
the leads of C1, C2, C8, and C9 for increased creepage.
It goes without saying that the PCB and components
should be clean and free of contamination, such as
solder flux or other residue. The design engineer must
verify the spacing indicated above meets or exceeds
any specifications with which they wish to comply.
The ISOmodem used with the components and
techniques described above offers the highest reliability
and lowest cost of any available solution. The use of
supplemental surge suppression components is not
recommended.
3.5.20. Country Dependent Setup
Configuring the Si2493/57/34/15/04 for operation in
different countries is done easily with AT commands. No
hardware changes are required. For this reason, the
Si2493/57/34/15/04 is truly a global modem solution.
The U-Register values for various countries are
presented in the country configuration table in "3.5.20.7.
Country Parameters Table" on page 142. All U-Register
values are in hexadecimal.
The settings for different countries can be broken into
three groups: Call Progress, Dialing, and Line Interface/
Control. Call Progress settings include filter coefficients,
cadence data, and threshold values. Dialing includes
DTMF levels, thresholds, and timing and pulse dialing
parameters. Line Interface settings include ac line
impedance, off-hook voltage and current characteristics,
ringer sensitivity, and transmit levels. CID (Caller ID)
settings are discussed in a separate section.
Tables 97–99 list the registers and bits used for global
configuration and the functions performed by each.
Many countries use all or at least some of the default
FCC settings.
138
with
insulating
material
capable
Rev. 0.9
of
3.5.20.1. Blacklisting
Blacklisting in the Si2493/57/34/15/04 prevents dialing
the same phone number more than three times in three
minutes. An attempt to dial a fourth time within three
minutes results in a “BLACKLISTED” result code. If the
blacklisting memory is full, any dial to a new number
results in a “BLACKLIST FULL” result code. The
number of allowable calls may be adjusted in S43. If
S43 = 3, the third call in S44 seconds is blacklisted. The
blacklisting time may be adjusted with register S44
(second units). A number is added to the blacklist only if
the connection fails. The S42 register controls
blacklisting.
Any number that is currently blacklisted is reported with
the %B command.
3.5.20.2. Special Country Requirements for India
To output a 0 dBm sine wave, use the following
commands for Si2493/57/34/15/04 (Revision A only):
AT:PF800, C4DD, 7B5C, 595F
AT*Y254:W50, 0, 5B86,1
AT:U46,0
AT*Y1X1DT1
This command string turns off the high-frequency DTMF
tone, leaving you with a single (the DTMF low-
frequency) tone when an ATDT is sent. The tone is
output continuously until any key is pressed. To restart
the tone output, type AT*Y1DT1. To change the tone
power level, type ATU46,00X0 (where X is a hex value
0–F representing power in –dBm from 0 to –15 dBm).
See "3.1.8. AT Command Set" on page 27 for additional
information on the AT command set and writing and
reading U and S registers.
%B
AT Command
0 (default)
S42
1
Report blacklisted number (if
any) followed by “OK”
Example: AT%B\r
5121234567
OK
Blacklisting
Function
Disabled
Enabled