SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 152

• Manufacturer Part Number: SI2457-D-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN93
The even-numbered registers, (UA0, UA2, etc.), control the amount of time the tone is expected to be present, and
the odd-numbered registers select the amount of time 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 0x0032 to UA0, 0x001E to UA1 and 0x0032 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.
Table 101 defines the SAS cadence for each supported country. The on-time is listed in bold. These data were
obtained from ITU-T Recommendation E.180 Supplement 2 (04/98).
152
Angola
Anguilla
Antigua and
Barbuda
Argentine Republic
Country
Waiting Tone
Waiting Tone
Waiting Tone
Call Waiting
Table 101. SAS Cadence for Supported Countries*
Tone
Tone
Table 100. SAS Tone Frequency
SAS_FREQ (U9F) SAS Frequency
Frequency (Hz)
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
400
440
480
425
Rev. 1.3
440 Hz (Default)
Cadence (seconds)
0.4 – 0.2 – 0.4 – 4.0
1400 Hz
400 Hz
420 Hz
425 Hz
480 Hz
450 Hz
900 Hz
950 Hz
523 Hz
0.5 – 10.0 – 0.5
0.6 – 10.0
1.0 – 5.0
UA0 = 0x003C
UA0 = 0x0064
UA1 = 0x01F4
UA0 = 0x0032
UA1 = 0x03E8
UA2 = 0x0032
UA1 = 0x03E8
UA0 = 0x0028
UA1 = 0x0014
UA2 = 0x0028
UA3 = 0x0190
U9F = 0x0001
U9F = 0x0000
U9F = 0x0004
U9F = 0x0003
U Registers