SI2401 Datasheet, PDF (15/74 Pages) List of Unclassifed Manufacturers – V.22BIS ISOMODEM WITH INTEGRATED GLOBAL DAA

Si2401
Low Power Modes
(WOR) = 1 (WOR = 0_b by default).
The Si2401 has three low-power modes:
„ DSP Powerdown. The DSP processor can be
powered down by setting register
SEB[3] (PDDE) = 1.
In this mode, the serial interface still functions, and
„ Total Powerdown. Setting SF1[5] = 1 and SF1[6] = 1
places the Si2401 into a total powerdown mode. All
logic is powered down including the crystal oscillator
and clock-out pin. Only a hardware reset can restart
the Si2401.
the modem detects ringing and intrusion. However,
no modem modes or tone detection features
function.
„ Wake-Up-On-Ring. By issuing the ATz command,
the Si2401 goes into a low-power mode where both
the microcontroller and DSP are powered down.
Only an incoming ring, a low TXD signal, or a total
reset will power up the chip again. Return from
Global DAA Operation
The Si2401 chipset contains an integrated silicon direct
access arrangement (silicon DAA) that provides a
programmable line interface to meet international
telephone line requirements. Table 10 gives the DAA
register settings required to meet various country PTT
standards.
wake-on-ring triggers the INT pin if S09[6]
Table 10. Country-Specific Register Settings
Register
SF5
SF6
Country
OHS ILIM RZ
RT MINI[1:0] DCV[1:0] ACT[3:0]
Australia
Brazil¹
TBR21²
10
0
0
0
00
00
0011
00
0
0
0
00
00
0000
00
1
0
0
11
11
0011
Czech Republic
FCC³
00
0
0
0
11
11
0011
00
0
0
0
11
11
0000
Latvia
Malaysia⁴
00
1
0
0
11
11
0011
00
0
0
0
00
00
0000
New Zealand
00
0
0
0
11
11
0100
Nigeria
00
1
0
0
11
11
0011
Philippines
00
0
0
0
00
00
0000
Poland, Slovenia
00
0
1
1
11
11
0000
South Africa
10
0
1
0
11
11
0000
South Korea
00
0
1
0
11
11
0000
Notes:
1. The following countries require the same settings as Brazil: Armenia, China, Egypt, Georgia,
Japan, Jordan, Kazakhstan, Kyrgyzstan, Malaysia, Moldova, Oman, Pakistan, Qatar, Russia,
Syria, Taiwan, Thailand, Ukraine.
2. The following countries require the same settings as TBR21: Austria, Bahrain, Belgium, Bulgaria,
Croatia, Cyprus, Denmark, Estonia, European Union, Finland, France, Germany, Greece,
Guadeloupe, Iceland, Ireland, Israel, Italy, Lebanon, Liechtenstein, Luxembourg, Malta, Martinique,
Morocco, Netherlands, Norway, Polynesia (French), Portugal, Reunion, Spain, Sweden,
Switzerland, Turkey, and the United Kingdom.
3. The following countries require the same settings as FCC: Argentina, Brunei, Canada, Chile,
Columbia, Dubai, Equador, El Salvador, Guam, Hong Kong, Hungary, India, Indonesia, Kuwait,
Macao, Mexico, Peru, Puerto Rico, Romania, Saudi Arabia, Singapore, Slovakia, Tunisia, UAE,
USA, Venezuela, Yemen.
4. Supported for loop current ≥ 20mA.
Preliminary Rev. 0.9
15