SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 66

• 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
3.3.10. S-Registers
S-Registers
configuration parameters during initialization and are
not usually changed during normal modem operation.
S-Register values other than defaults must be written
via the ATSn=x command after every reset event. S-
Registers are specified as a decimal value (S01 for
example), and the contents of the register are always a
decimal number. Table 31 lists the S-Registers available
on the Si2493/57/34/15/04, their function, default value,
range of values, and units.
Many S-Registers are becoming industry standards,
such as S0 (number of rings for auto answer), S1 (ring
count), and S2 (escape character) among others.
66
S-Register
(Decimal)
0
1
2
3
4
5
6
7
8
9
are
Automatic answer—This value represents the number
of rings the Si2493/57/34/15/04 must detect before
answering a call. 0 disables auto answer.
Ring counter—Counts rings received on current call.
ESC code character
Carriage return character
Linefeed character
Backspace character
Dial tone wait timer—This timer sets the number of
seconds the Si2493/57/34/15/04 waits before blind
dialing and is only active if blind dialing is enabled (X0,
X1, X3).
Carrier wait timer—This timer starts when dialing is
completed. It sets the number of seconds the modem
waits without carrier before hanging up and the num-
ber of seconds the modem waits for ringback when
originating a call before hanging up. The register also
sets the number of seconds the answer tone continues
while using the AT*Y2A command.
Dial pause timer for “,” and “<” dial command modifiers
Carrier presence timer—Time the remote modem car-
rier must be detected before activating or reactivating
DCD (carrier loss debounce time).
typically
used
Table 31. S-Register Descriptions
Function
to
set
modem
Definition
Rev. 0.9
However, there are usually variations in the function
(and availability) of S-Registers from one chipset to
another or from one chipset manufacturer to another.
These variations are due to a combination of feature
availability and choices made during the chip design.
Verify S-Register functions, defaults, ranges, and values
when adapting the Si2493/57/34/15/04 to an existing
design. This simple step can save time and help speed
product development. If a particular S-Register is not
available on the Si2493/57/34/15/04, the register may
not be necessary, or the function of the S-Register may
be available with the use of U-Registers (discussed
later) or through an AT command.
(Decimal)
13 (CR)
Default
08 (BS)
10 (LF)
43 (+)
02
80
02
06
0
0
Range
0–255
0–255
0–255
0–255
0–255
0–255
0–255
0–255
0–255
1–255
0.1 second
seconds
seconds
seconds
ASCII
ASCII
ASCII
ASCII
Units
rings
rings