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SI2401 Datasheet, PDF (15/76 Pages) List of Unclassifed Manufacturers – V.22BIS ISOMODEM WITH INTEGRATED GLOBAL DAA
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Si2401
4.3. Low Power Modes
(WOR) = 1 (WOR = 0b 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
4.4. 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
Si2401 Register
Country
OHS
Algeria
10
Argentina
00
Armenia
00
Australia
01
Austria (EU)
10
Bahamas
00
Bahrain
10
Belarus
00
Belgium (EU)
10
Bermuda
00
Brazil
00
Brunei
00
Bulgaria
10
Canada
00
Caribbean
00
Chile
00
China - People's Republic
00
Colombia
00
Costa Rica
00
SF5
ILIM
RZ
1
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
SF6
RT MINI[1:0] DCV[1:0] ACT[3:0]
AT Command
String
0
00
10
0011 ATSF5=28SF6=23
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
10
01
0011 ATSF5=10SF6=93
0
00
10
0011 ATSF5=28SF6=23
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0011 ATSF5=28SF6=23
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0011 ATSF5=28SF6=23
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0011 ATSF5=28SF6=23
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
0
00
10
0000 ATSF5=00SF6=20
Rev. 1.0
15
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