SI2457-D-FS Silicon Laboratories Inc, SI2457-D-FS Datasheet - Page 222

• 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

AN93
7.7.8. Call—Automatic Pulse Dial
Table 140 lists the commands that occur after the configuration defined in Table 136.
7.7.9. Answer
A ring event will prompt the user to press the speakerphone button. This will generate a SP Button On Event and
the Speakerphone Configuration procedure defined in Table 136 on page 219 should be used to answer the call.
For ring detection and local ring tone/melody generation, see "7.6.2. TAM Hands-Free—Idle".
7.7.10. Handset Transition
For a SP Button Off Event (Handset Off-Hook), the voice driver should use the command sequence in Table 141 to
return to the Handset mode. Note the voice driver is responsible for tracking the handset hook switch state.
222
Commands / Data
Host to Modem
Host to Modem Commands / Data
ATDP102
AT:U72,05B3
AT:U72,065C
AT:U72,075E
AT:U72,0110
AT:U199|A
Table 141. Speakerphone to Handset Transition
Table 140. Speakerphone Automatic Pulse Dial
Modem to Host Result
Codes/Data
OK
Modem to Host
Result Codes/
Rev. 1.3
Perform automatic pulse dial of 102. Modem will return
OK. The user will not receive <DLE> events for dial
tone, ring-back, busy, and quiet since the detectors are
disabled. See Table 122 on page 198 for details on
active detectors.
Data
OK
OK
OK
OK
OK
Mute the microphone and speaker paths to
the codec.
Configure Si3000 Register 1:
Enable speaker driver
Disable line output driver
Disable telephone instrument driver
Enable MBIAS output
Configure Si3000 Register 5:
10 dB Line In gain
Mute Line In
20 dB MIC input gain
Enable MIC input
Mute telephone instrument input
Enable IIR filter
Configure Si3000 Register 6:
0 dB RX PGA gain
Disable Line Out
Disable telephone instrument output
Configure Si3000 Register 7:
0 dB RX PGA gain
Enable SPKRL
Mute SPKRR
Local Modem Actions
Local Modem Actions