SI2400-KS Silicon Laboratories Inc, SI2400-KS Datasheet - Page 33

• Manufacturer Part Number: SI2400-KS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Type: Integrated Global DAAr

Specifications of SI2400-KS

• Package / Case: 16-SOIC (3.9mm Width)
• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: UART
• Voltage - Supply: 3 V ~ 5.25 V
• Mounting Type: Surface Mount
• Product: Modem Chip
• Supply Voltage (min): 3 V
• Supply Current: 21 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 336-1166 - BOARD EVAL FOR SI2400 ISOMODEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 336-1093

6.5.1. A0
Answer and transmit the AIN analog input signal on the
telephone line and connect the phone line receive
signal to the AOUT pin (see Figure 10B). This mode
also monitors for local DTMF received signals and user
defined tones. Any received character is echoed. User-
defined tones are echoed as X and Y. Transmission of
any data to the Si2400 UART will cause the modem to
go into the command mode. The modem can then send
DTMF tones via the “ATDT #!0” command (where #
represents a DTMF character 0-9, A-D, # or*) or be
disconnected with the “ATH” command. The “ATDT #!0”
command string does not initiate a new call since the
modem is already connected.
Notes:
6.5.2. !0
After dialing the number, go to DTMF monitor mode with
no modem connection. After dialing the !0 mode is the
same as the A0 mode described previously.
Example: Dial a number and detect DTMF tones in
“data mode.”
Command
1. DRT must be set to data mode (SE4[5:4](DRT) = 00
2. DTMF detection is only intended for local detection
Table 18. AT Command Set Extensions
A0
A1
X1
X2
X3
before attempting to send tones after a “A0” command.
User defined tones are enabled by setting S14[6]
(UDF) = 1
defined on page 40. The online mode can be resumed
by issuing the “ATO” command. (see the “!0” section
for more detail).
of a parallel device.
!0
!1
!2
!7
b
Function
Answer and switch to DTMF monitor
mode
Answer and switch to “SIA Format”
Dial and switch to DTMF monitor
mode
Dial and switch to DTMF security
mode
Dial and switch to “SIA Format”
Dial and switch to pulse security mode
SIA half-duplex mode search
SIA half-duplex return online as
transmitter
SIA half-duplex return online as
receiver
and require DSP low-level control as
for Alarm Industry
b
Rev. 1.3
)
Example: Dial a number and place the Si2400 in “voice
mode.”
DTMF detection is only intended for local detection of a
parallel device, not for detection of a remote source
over two local loops. “Data mode” (see example above)
DTMF detection is reliable on a quiet line without the
presence of interfering audio signals or voice. DTMF
detection, although possible, in the “voice mode” (see
example above) is not recommended and can be
unreliable.
6.5.3. !1
Dial number and follow the DTMF security protocol.
The format for this command is as follows:
ATDT<phone number>!1<message 1><CR>
K
!<message 2><CR>
K
After “,” result code
After “,” result code
After “,” result code
ATSE4=00O<CR>
ATSE4=00O<CR>
ATDT#!0<CR>
ATDT#!0<CR>
ATDT1234!0
Command
Command
ATSE2=02
ATSE4=02
ATSEf=02
ATH
ATH
Dials #
Detects DTMF tones in
“data mode”
Sends DTMF tones for
1234
Detects DTMF tones in
“data mode”
Terminates call
Powers ADC and DAC
Sets GPIO1 as analog input
Dials #
Modem in “voice mode”
Audio placed on Ain
(GPIO1) is transmitted and
received audio is available
on AOUT (see Figure 10).
Terminates call
Returns Si2400 to “data
mode” for next dial com-
mand.
Result
Result
Si2400
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