SI3015-FS Silicon Laboratories Inc, SI3015-FS Datasheet - Page 23

• Manufacturer Part Number: SI3015-FS
• Description: SI2400 ISOMODEM LINE-SIDE
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3015-FS

• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Baud Rates: -

indication that the phone is ringing. It is necessary to
end the DTMF detection mode by sending the ATH
command before originating (ATDT) or answering (ATA)
a call.
Tone Generation and Tone Detection
The Si2400 provides comprehensive and flexible tone
generation and detection. This includes all tones
needed to establish a circuit connection and to set up
and control a communication session. The tone
generation furnishes the DTMF tones for PSTN auto
dialing and the supervisory tones for call establishment.
The tone detection provides support for call progress
monitoring. The detector can also be user-programmed
to recognize up to four tones and two tone detection
bandpass filters.
DTMF tones may be detected and generated by using
the “ATA0” and “ATDT!0” commands described in the
AT command section. A description of the user-
programmable tones can be found in "DSP Registers"
on page 40.
The Si2400 DTMF decoder is designed for single loop
applications such as local detection of a parallel DTMF
device. Applications requiring DTMF detection across
two loops such as programming via a remote keypad
are not supported.
8-Bit Data
8-Bit Data
RXD
TXD
Start
Start
B0
B0
B1
D7
B1
D7
D8
B2
B2
Note: Baud rates (programmed through register SEO) can be set to the following: 228613, 245760 and 307200.
D8
D9
B3
High-Byte
High-Byte
D9
B3
D10
B4
D10
B4
D11
B5
D11
B5
D12
B6
PCM Transm it Tim ing
Figure 9. PCM Timing
PCM Receive Tim ing
D12
B6
B7
D13
D13
B7
Rev. 1.1
Stop
Stop
PCM Data Mode
The Si2400 has the ability to bypass the modem
algorithm and send 14-bit PCM data, sampled at
9600 Hz, across the DAA. To use this mode, it is
necessary to set the serial link (DTE) rate to at least
228613 bps SE0[2:0] (SD) = 101b, set S13[0] (PCM)
= 1b, and set SE1[7:6] (MCKR) = 00b. The data format
(Figure 9) requires that the high byte be sent first
containing bits D13–D7. The LSB (B0) must equal zero.
The low byte must be sent next containing bits D6–D0;
the LSB (B0) must equal one. The receive data format is
the same.
In PCM data mode, the line can be answered or
originated using the “ATDT#;” command. (The “;” is
used to keep the modem from leaving the command
mode.) When PCM data mode is enabled (set
S13[0] (PCM) = 1b and SE4[5:4] (DRT) = 00b (default)),
data will immediately begin streaming into and out of the
serial port at a 9600 Hz 2 word rate. In this mode, the
controller will not detect dial tones or other call progress
tones. If desired, the user can monitor these tones using
manual call progress detection prior to entering the
PCM data mode.
To exit the PCM data mode, an escape must be
performed either by pulsing the ESC pin or by using 9-
bit data mode and setting the ninth bit. (TIES cannot be
used in PCM data mode.) The escape command will
disable PCM streaming, and the controller will again
accept AT style commands.
Start
Start
B0
B0
D0
B1
D0
B1
D1
B2
Low-Byte
Low-Byte
B2
D1
D2
B3
D2
B3
B4
D3
D3
B4
D4
B5
D4
B5
D5
B6
Si2400
D5
B6
B7
D6
D6
B7
Stop
Stop
23