SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 79

• 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

3.3.15. U31–U33 (Ringback Cadence Registers)
U31, U32, and U33 set the ringback cadence minimum
total time (RMTT), ringback cadence delta time (RDLT),
and ringback cadence minimum on time (RMOT) (see
Table 37).
cadences are specified as a range for ON time
(minimum ON and maximum ON) and a range for OFF
time (minimum OFF and maximum OFF). The three
values represented by RMTT, RDLT, and RMOT fully
3.3.16. U34–U35 (Dial Tone Timing)
U34 determines the period of time the modem attempts
to detect a dial tone. U35 sets the time within this
window that the dial tone must be present in order to
return a valid dial tone detection. The value stored in
U35 is the hexadecimal representation of the time in
seconds multiplied by 7200.
3.3.17. U37–U45 (Pulse Dial Registers)
Registers U37–U40 set the number of pulses to dial
digits 0 through 9, respectively (see Table 39). The
values are entered in hexadecimal format with digit 0
having a default setting of 0x000A (10 decimal) pulses,
digit 1 having a default setting of one pulse, digit 2
having a default setting of two pulses, etc. This pulse
arrangement is used throughout most of the world.
There are, however, two exceptions—New Zealand and
Sweden. New Zealand requires 10 pulses for 0, nine
pulses for 1, eight pulses for 2, etc.
Register
Register
U31
U32
U33
U34
U35
Country-specific
RMOT
DTWD
DMOT
RMTT
Name
Name
RDLT
Ringback cadence minimum total time in seconds multiplied by 7200.
Ringback cadence delta in seconds multiplied by 7200.
Ringback cadence minimum on time in seconds multiplied by 7200.
Window to look for dial tone in seconds multiplied by 1000
Minimum dial tone on time in seconds multiplied by 7200
settings
Table 37. Ringback Cadence Registers
Table 38. Dial Tone Timing Register
for
ringback
Rev. 0.9
Description
Description
specify these ranges. RMTT, minimum total time, is
equal to the minimum ON time plus the minimum OFF
time. RDLT (allowable delta) is equal to the maximum
total time (maximum ON time plus the maximum OFF
time) minus the minimum total time (RMTT). RMOT is
the minimum ON time. The values stored in the
registers are the hexadecimal representation of the
times in seconds multiplied by 7200. Default values
meet FCC requirements.
The value in U34 is the hexadecimal representation of
the time in seconds multiplied by 1000. The time
window represented in U34 must be larger than the dial
tone present time represented in register U35 (see
Table 38).
Sweden, on the other hand, requires one pulse for 0,
two pulses for 1, etc. Complete information is provided
in "3.5.20. Country Dependent Setup" on page 138.
U42, U43, and U45 set the pulse dial break-time
(PDBT), make-time (PDMT), and inter-digit delay time
(PDIT), respectively. The values are entered in
hexadecimal format and represent ms units. The default
values meet FCC requirements. The default dialing
speed is 10 pps. See "3.5.20. Country Dependent
Setup" on page 138 for Japanese 20 pps dialing
configuration.
AN93
Default
0xEF10
Default
0x1B58
0x2D00
0x4650
0x1200
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