SI2457-C-FT Silicon Laboratories Inc, SI2457-C-FT Datasheet - Page 25

• Manufacturer Part Number: SI2457-C-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-C-FT

• Package / Case: 24-TSSOP
• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel, UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Operating Frequency: 4.92 MHz
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Supply Current: 26 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

+ESA Options
+ESA = A
+ESA = A,B
+ESA = A,B,C
+ESA = A,B,C,E
+ESA = A,B,C,E,F
+ESA = A,B,C,E,F,
G
+FCLASS = X
+FRM = X
+FTM = X
Command
Table 11. Basic AT Command Set (Command Defaults in Bold) (Continued)
Synchronous access mode control options
A
B
mode
C
ing
D
E
F
G
Class 1 Mode Enable for V.29 fast connect.
X
0
1
Class 1 Receive Carrier for V.29 fast connect.
X
2
95
96
Class 1 Transmit Carrier for V.29 fast connect.
X
2
53
54
95
96
Specifies action taken if an underrun condition occurs during transparent sub-mode.
framed sub-mode.
0 Modem transmits abort on underrun in middle of frame.
1 Modem transmits flag on underrun in middle of frame and notifies host of underrun
0 Modem transmits 8-bit SYN sequences on idle.
0 Modem transmits 8-bit HDLC flags on idle.
Specifies action taken if an underrun or overrun condition occurs after a non-flag dur-
Specifies V.34 half duplex operation.
Specifies CRC polynomial used while in framed sub-mode.
Specifies NRZI encoding and decoding.
0 NRZI encoding and decoding disabled.
Specifies SYN.
255
Specifies action taken if an underrun condition occurs after a flag during framed sub-
This parameter should not be used.
0 CRC generation checking disable.
1 16-bit CRC generation and checking is performed by the modem.
or
overrun.
Mode
Off
Enables support for Class 1 mode for use in the V.29 fast connect mode.
Mode
Transmit V.21 (980 Hz) tone for longer than 100 ms, then send answer tone
V.29 short synchronous.
V.29 full synchronous.
Mode
Transmit V.21 (980 Hz) tone.
Same as &T4, but transmit V.29 7200 bps. Data pattern set by S40 register. AT +
Same as &T4, but transmit V.29 9600 bps. Data pattern set by S40 register. AT +
V.29 short synchronous.
V.29 full synchronous.
FCLASS = 0 must be sent to restore the ISOmodem® to normal operation after
test.
(2100/2225 Hz) for 200 ms.
FCLASS = 0 must be sent to restore the ISOmodem to normal operation after
test.
Preliminary Rev. 0.7
Si2457/34/15/04-Si3008
Action
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