SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 194

• 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
7.4. Initialization
The following sequence is used after power up or hardware reset to prepare the modem for voice operations. This
procedure occurs in the Initialize state presented in Figure 31. After initialization, the system will be in the TAM
Hands-Free mode, which is discussed in "7.3.3.1. TAM Hands-Free".
194
ATZ
ATE0+FCLASS = 0
AT+IPR = 115200
[ Apply Patch Commands ]
AT:U199|A
ATE0+FCLASS = 8
AT+VLS = 0
AT+VLS = 14
AT*Y254:W59|1
AT*Y0
AT+VCDT = 1
AT+VCID = 1
AT+VSD = 129
AT+PCW = 0
AT:U0B1,0500
AT:U0B5,0200
AT:U0B6,0100
AT:U0B9,0300
AT:U0B4,0600
Host to Modem Commands
Table 119. Initialization Sequence
Rev. 1.3
Host Result
Modem to
Codes
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Reset. The Si3000 is not reset by this
command.
Disable local AT command echo and
enter data mode, which is necessary for
patch loading.
Disable autobaud and set rate to
115,200 bps.
Apply the modem patch commands.
Mute the microphone and speaker
paths to the codec.
Disable local AT command echo and
enter voice mode. Limited V.253 event
reporting enabled with default setting of
+VLS=0.
Disable voice mode. Used as a transi-
tion point between non-zero +VLS voice
modes.
Setup on-hook TAM voice mode. See
Table 117 on page 190 for details.
Enable the SSI interface to the Si3000.
Exit the AT*Y command mode.
Enable always-on Type I Caller ID.
Enable formatted Caller ID.
Set silence detection sensitivity level.
Enable Type II Caller ID reporting.
Set Si3000-to-DAA transmit gain.
Set DAA-to-Si3000 receive gain.
Set Sidetone gain.
Set VTS-to-Si3000 transmit gain.
Set VTS-to-DAA transmit gain.
Local Modem Actions