SI3008-B-FS Silicon Laboratories Inc, SI3008-B-FS Datasheet - Page 12

• Manufacturer Part Number: SI3008-B-FS
• Description: IC ISOMODEM FCC LINE-SIDE 8SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3008-B-FS

• Data Format: V.22, V23, V.32, V.34, V.90, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Product: Modem Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si2401/Si3008
4.1. Serial Interface
The Si2401 has a universal asynchronous receiver/
transmitter (UART) serial interface compatible with
standard microcontroller serial interfaces. After powerup
or reset, the speed of the serial (Data Terminal
Equipment—DTE) interface is set by default to
2400 bps with the 8-bit, no parity, and one-stop bit (8N1)
format described below.
The serial interface DTE rate can be modified by writing
SE0[2:0] (SD) with the value corresponding to the
desired DTE rate. (See Table 9.) This is accomplished
with the command, ATSE0=xx, where xx is the
hexadecimal value of the SE0 register.
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*Note: The Si2401 only adjusts its DCE rate from 2400 bps to 1200 bps if it is connecting to a V.22-only (1200 bps only)
modem. Since the V.22bis specification does not outline a fallback procedure, the host should implement a fallback
mechanism consisting of hanging up and connecting at a lower baud rate. Retraining to accommodate changes in
line conditions that occur during a call must be implemented by terminating the call and redialing.
DTE Rate (bps)
Configuration
SIA—Pulse
SIA Format
Bell 212A
Bell 103
Security
V.22bis
307200
115200
19200
38400
V.22
1200
2400
9600
V.21
V.23
V.23
300
Table 9. DTE Rates
*
*
SE0[2:0] (SD)
000
001
010
011
100
101
110
111
Modulation
Table 8. Selectable Configurations
DPSK
DPSK
DTMF
Pulse
QAM
FSK
FSK
FSK
FSK
Rev. 1.1
Frequency (Hz)
1080/1750
1200/2400
1200/2400
1300/2100
1300/1700
1170/2125
1200/2400
1170/2125
Immediately after the ATSE0=xx string is sent, the host
UART must be reprogrammed to the new DTE rate in
order to communicate with the Si2401.
The carriage return character following the ATSE0=xx
string must be sent at the new DTE rate to observe the
“O” response code. See Table 12 on page 20 for the
response code summary.
4.2. Configurations and Data Rates
The Si2401 can be configured to any of the Bell and
CCITT operation modes listed in Table 10. When
configured for V.22bis, the modem connects at
1200 bps if the far end modem is configured for V.22.
This device also supports SIA and other protocols for
the security industry. Table 8 provides the modulation
method, carrier frequencies, data rate, baud rate, and
notes on standard compliance for each modem
configuration of the Si2401. Table 10 shows example
register settings (S07) for some of the modem
configurations.
Carrier
—
—
300 half-duplex
Data Rate
1200/75
600/75
(bps)
1200
2400
1200
Low
300
300
40
Full; plus reversing
Compliance
300 bps only
No retrain
Standard
(Europe)
Full
Full
Full
Full
Full
Full