SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 36

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• 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: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
36
+ESA =
A,B,C,D,E,F,G
+FCLASS = X Class 1 Mode Enable.
+FRM = X
+FTM = X
Command
Synchronous access mode control options
A – Specifies action taken if an underrun condition occurs during transparent sub-mode
B – Specifies action taken if an underrun condition occurs after a flag during framed sub-
mode
C – Specifies action taken if an underrun or overrun condition occurs after a non-flag during
framed sub-mode
D – Specifies V.34 half duplex operation. This parameter should not be used.
E – Specifies CRC polynomial used while in framed sub-mode
F – Specifies NRZI encoding and decoding
G – Defines 8-bit SYN
X
0
1
256
Class 1 Receive Carrier.
X
2
95
96
200
Class 1 Transmit Carrier.
X
2
53
54
95
96
201
202
0 = Modem transmits 8-bit SYN sequences (see +ESA[G]) on idle.
0 = Modem transmits 8-bit HDLC flags on idle.
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 or
overrun.
0 = CRC generation checking disable
1 = 16-bit CRC generation and checking is performed by the modem
0 = NRZI encoding and decoding disabled
255 = Fixed at 255 (marks)
Mode
Off
Enables support for V.29 Fast Connect mode.
SMS mode
Mode
Detect V.21 (980 Hz) tone for longer than 100 ms, then send answer tone
V.29 short synchronous.
V.29 full synchronous.
Returns to data mode prepared to receive an SMS message.
Mode
Transmit V.21 (980 Hz) tone and detect (2100/2225 Hz). Stop transmit 980 Hz when
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.
Returns to data mode prepared to transmit an SMS protocol 1 message.
Returns to data mode prepared to transmit an SMS protocol 2 message.
(2100/2225 Hz is detected.
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.
Table 18. Basic AT Command Set (Continued)
Rev. 0.9
Action