SI2493-C-GT Silicon Laboratories Inc, SI2493-C-GT Datasheet - Page 113

• Manufacturer Part Number: SI2493-C-GT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-GT

• 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: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The SAS tone varies between countries and requires
configuration of the user registers, U9F–UA9. The
SAS_FREQ (U9F) register sets the expected SAS tone
frequency as shown in Table 81. The default SAS
frequency is 440 Hz. The expected cadence is set in the
ten cadence registers, SAS_CADENCE0 (UA0) through
SAS_CADENCE9 (UA9).
Message Type (MDMF)
Message Length
Parameter Type (Date/Time)
Parameter Length
Month
Day
Hour
Minutes
Parameter Type (Number)
Parameter Length
Number
Parameter Type (Name)
Parameter Length
Name
Checksum
Character Description
SAS_FREQ (U9F)
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
Table 81. SAS Tone Frequency
Table 80. MDMF Parameters
35 31 32 35 35 35 31 32 33 34
4A 4F 48 4E 5F 44 4F 45
Rev. 0.9
The even-numbered registers, (UA0, UA2, etc.), control
the time that the tone is expected to be present, and the
odd numbered registers select the time that the tone
must not be present. The values are expressed in
10 millisecond units. For example, a cadence of on
500 ms, off 300 ms then on for 500 ms may be selected
by writing 0032h to UA0, 001Eh to UA1 and 0032h to
UA2. The unused registers should be written to 0. The
default cadence setting is UA0 equal to 001Eh, and the
remaining nine registers are set to zero.
Hex Value
30 39
31 31
31 36
32 31
0A
80
20
01
08
02
07
08
40
SAS Frequency
440 Hz (Default)
1400 Hz
400 Hz
420 Hz
425 Hz
480 Hz
450 Hz
900 Hz
950 Hz
523 Hz
ASCII Value
5125551234
JOHN_DOE
09
11
16
21
AN93
113