SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 45

• 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

Command
%Cn
%C0
%C1
%C2
%C3
%On
%O1
%O2
%Vn
%V0
%V1
%B
%$
Display AT% command settings (see text for details).
Report blacklist. See also S42 register.
Data compression.
Disable V.42bis and MNP5 data compression.
Enable V.42bis in transmit and receive paths.
If MNP is selected (\N2), %C1 enables MNP5 in transmit and receive paths.
Enable V.42bis in transmit path only.
Enable V.42bis in receive path only.
Answer mode.
Si2493/57/34/15/04 answers a call in answer mode.
Si2493/57/34/15/04 answers a call in originate mode.
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the Si2493/57/34/15/04 automatically checks the
telephone connection for whether a line is present. If a line is present, the Si2493/57/34/15/04 auto-
matically checks if the line is already in use. Finally, the Si2493/57/34/15/04 checks line status both
before going off-hook and again before dialing. %V1 uses the fixed method, and %V2 uses the
adaptive method. %V0 (default) disables this feature.
Disable automatic line-in-use detection.
Automatic Line Status Detection - Fixed Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2493/57/34/15/04
compares the line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84):
Loop Voltage
0 ≤ LVCS ≤ NOLN
NOLN ≤ LVCS ≤ LIUS
LIUS ≤ LCVS
Once the call has begun, the off-hook intrusion algorithm (described in "3.5.9. Intrusion Detection—
Off-Hook Condition" on page 124) operates normally. In addition, the Si2493/57/34/15/04 reports
“NO LINE” if the telephone line is completely disconnected. If the HOI bit (U77, bit 11) is set, “LINE
IN USE” is reported upon intrusion.
Table 20. Extended AT% Command Set
Action
Report “NO LINE” and remain on-hook.
Report “LINE IN USE” and remain on-hook.
Go off-hook and establish a modem connection.
Rev. 0.9
Action
AN93
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