SI2493-C-FT Silicon Laboratories Inc, SI2493-C-FT Datasheet - Page 110

• Manufacturer Part Number: SI2493-C-FT
• Description: 56 KBPS, V.92 ISOMODEM SYSTEM-SIDE - LEAD-FREE TSSOP 0 TO 7
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FT

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
3.5.2. Voice Mode Example
Perform the following steps:
1. Connect hardware as shown in Figure 22. If using the Si3000 SSI EVB evaluation board, note that the Si3000
2. Enter the following AT commands to initialize the modem:
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
8. Voice mode does not support T2CID, %V2, or overlap dialing.
110
ATZ
ATE0
AT:U0071,11
AT*Y254:W0059,7785
AT*Y254:W004B,011C
AT*Y254:W004B,0545
AT*Y254:W004B,065D
AT*Y254:W004B,075C
AT*Y0
Evaluation Board requires an external 12-volt 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.
(dot character is in-between "AT" and "N", where N is a DTMF digit 0-9,A-F). The main reason for using the
"AT.N" instead of ATDT is that usage of AT.N ensures that carrier loss detection is not enabled inadvertently.
Using ATDT may result in a connection hang-up if the ambient noise is too low. Example:
AT.1 sends DTMF digit 1, return to voice mode.
reset modem
disable echo
enable voice routing firmware
enable Si3000 Hardware Interface
n |= 1
Si3000 Reg 01 = 1C
Si3000 Reg 05 = 45
Si3000 Reg 06 = 5D
Si3000 Reg 07 = 5C
In actual application, this line
must be implemented as a read-modify-
write consisting of the following:
n = AT*Y254:Q0059
AT*Y254:W0059,n
This applies power to SPKRx,HDST,LINEO
Enable HDST into ADC mixer
MIC input disabled
LINEI input disabled
Activate HDST as output
Keep LINEO muted
0 db Receive Gain Setting
0 dB Transmit Gain
Keep SPKRx muted
Rev. 0.9