Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 12)

Si2493/57/34/15/04
Global ISOmodem-EVB
12 Rev. 0.6
2.2. Voice Mode Example
Perform the following steps:
1. Connect hardware as shown in Figure 8 on page 9. Note that the Si3000 Evaluation Board requires an external 12 V supply
and derives 5 V power from the Si24xx-EVB. The Si24xx-EVB should be connected to the supplied power adapter or
powered through USB.
2. Enter the following AT commands to initialize the modem:
ATZ reset modem
ATE0 disable echo
AT:U0071,11 enable voice routing firmware
AT*Y254:W0059,7785 enable Si3000 Hardware Interface
In actual application, this line
must be implemented as a read-modify-
write consisting of the following:
n = AT*Y254:Q0059
n |= 1
AT*Y254:W0059,n
AT*Y254:W004B,011C Si3000 Reg 01 = 1C
This applies power to SPKRx,HDST,LINEO
AT*Y254:W004B,0545 Si3000 Reg 05 = 45
Enable HDST into ADC mixer
MIC input disabled
LINEI input disabled
AT*Y254:W004B,065D Si3000 Reg 06 = 6D
Activate HDST as output
Keep LINEO muted
0 db Receive Gain Setting
AT*Y254:W004B,075C
Si3000 Reg 07 = 5C
0 dB Transmit Gain
Keep SPKRx muted
3. Type "ATDTnnn", where nnn represents the telephone number of the remote telephone.
4. The remote phone rings and should be picked up.
5. Also pick up the local phone connected to the Si3000 Evaluation Board.
6. At this point, a voice connection exists between the two telephones.
7. It is also possible to send a series of single digit DTMF tones to the remote phone using the "AT.N" command (dot character
is in-between "AT" and "N", where N is a DTMF digit 0-9,A-F).
Example:
AT.1 sends DTMF digit 1, return to voice mode.