7.5. Handset. Silicon Laboratories Si2493, Si2404, Si2415, Si2434, Si2494, Si2439, Si2457, Si2443

AN93

AT:U72,075E

AT:U72,0900

AT:U0B1,0

AT:U0B5,0

AT:U199&FFF7

Table 133. Initialization Sequence (Continued)

OK

OK

OK

OK

OK

Configure Si3000 Register 7:

0 dB RX PGA gain

Enable SPKRL

Mute SPKRR

Configure Si3000 Register 9:

0 dB Line Out attenuation

0 dB Speaker output attenuation

Disable Si3000-to-DAA transmit gain path. This ensures codec tones are not sent to the FDV and DTMF.

Disable DAA-to-Si3000 receive gain path. This ensures line events such as

CID and ring tone are not heard via the codec.

Enable speaker for local ring tone/alert tones.

7.5. Handset

7.5.1. Overview

This mode uses the voice pass-through connection to route SSI data between the Si3000 and the DAA. The modem remains in AT command mode and provides V.253 event notifications. The host controller is responsible for detecting the status of the handset position. The following sections provides detailed examples of originating and answering a voice call with the handset.

7.5.2. Handset Configuration

Table 134 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 raised handset event would prompt the Handset Configuration sequence to answer the call. The UB1, UB5, UB6, and

Si3000 register configuration vary with the customer’s production hardware. The UB5 register serves as the general volume control in this mode.

Rev. 1.41

209

A N 9 3

Table 134.

Handset Configuration

Host to Modem Commands / Data

Modem to Host

Result Codes/

Data

AT:U199|A

AT+VLS=0

AT+VLS=13

AT:U0B1,0500

AT:U0B5,0200

AT:U72,0110

AT:U72,05B3

AT:U72,065C

AT:U72,075E

AT:U72,0900

AT+VSP=0

AT:U199&FFF5

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

Local Modem Actions

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 131 on page 202 for details.

Restore Si3000-to-DAA transmit gain path.

Restore DAA-to-Si3000 receive gain path.

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

Configure Si3000 Register 9:

0 dB Line Out attenuation

0 dB Speaker output attenuation

Select handset voice path. See Figure 31 on page 200 for details.

Enable the microphone and speaker paths to the codec.

210 Rev. 1.41