SI2457-D-FS Silicon Laboratories Inc, SI2457-D-FS Datasheet - Page 219

• Manufacturer Part Number: SI2457-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FS

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

7.7.4. Speakerphone Configuration
This section covers the speakerphone call and answer cases, and the switching between the handset mode and
speakerphone mode. Table 136 contains the initial configuration that is used by all dialing use cases. The
sequence is also sent for the answer case. The user will have been notified of the incoming call through a local
+VTS ring tone and a SP Button On Event would prompt the Speakerphone Configuration sequence to answer the
call. The UB1, UB5, UB6, and Si3000 register configurations vary with the customer’s production hardware. The
UB5 register serves as the general volume control in this mode.
Host to Modem Commands / Data
AT:U0B1,0500
AT:U0B5,0200
AT:U72,065E
AT:U72,075E
AT:U72,0108
AT:U72,0597
AT+VLS=13
AT+VLS=0
AT:U199|A
Table 136. Speakerphone Configuration
Modem to Host
Result Codes/
Rev. 1.3
Data
OK
OK
OK
OK
OK
OK
OK
OK
OK
Mute the microphone and speaker paths to
the codec.
Disable voice mode. Used as a transition
point between non-zero +VLS voice modes.
Setup off-hook voice mode. See Table 117
on page 190
switch the modem to off-hook state.
Restore Si3000-to-DAA transmit gain path.
Restore DAA-to-Si3000 receive gain path.
Configure Si3000 Register 1:
Disable speaker driver
Enable line output driver
Disable telephone instrument driver
Disable MBIAS output
Configure Si3000 Register 5:
10 dB Line In gain
Enable Line In
20 dB MIC input gain
Mute MIC input
Mute telephone instrument input
Enable IIR filter
Configure Si3000 Register 6:
0 dB RX PGA gain
Enable Line Out
Disable telephone instrument output
Configure Si3000 Register 7:
0 dB RX PGA gain
Enable SPKRL
Mute SPKRR
Local Modem Actions
for details. This command will
AN93
219