SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 89

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

Specifications of SI2457-D-FT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

S Register
(Decimal)
10
12
14
24
30
38
40
Wait for dial tone delay timer. This timer starts when
Sleep inactivity time—This is the time the modem
Carrier loss timer—The time a remote modem carrier
must be lost before the ISOmodem disconnects. Set-
ting this timer to 255 disables the timer, and the
modem does not time out and disconnect. If S10 is
less than S9, even a momentary loss of carrier causes
a disconnect. Use for V.22bis and lower data rates.
Escape code guard timer—Minimum guard time
before and after +++ to recognize a valid escape
sequence.
the W command is executed in the dial string.
operates in normal power mode with no activity on the
UART, parallel port, SPI port, or telephone line before
entering the low-power sleep mode and waking on
ring. The modem remains in the normal power mode,
regardless of activity, if the timer is set to 0.
Disconnect activity timer—Sets the length of time that
the modem stays online before disconnecting with no
activity on the UART, parallel port, SPI port, or tele-
phone line (ring, hookswitch flash, or Caller ID). This
feature is disabled if set to 0.
Hang up delay time—Maximum delay between receipt
of the ATH0 command and hang up. If time out occurs
before all data can be sent, the NO CARRIER (3)
result code is sent. An OK response is sent if all data
are transmitted prior to time out. This register applies
to V.42 mode only. S38=255 disables time out, and the
modem only disconnects if data are successfully sent
or carrier lost.
Data Pattern - Data pattern generated during &T4 and
&T5 transmit tests.
0 – All spaces (0s)
1 – All marks (1s)
2 – Random data
Table 45. S-Register Descriptions (Continued)
Function
Definition
Rev. 1.3
(Decimal)
Default
14
50
12
20
0
0
0
10–255
Range
1–255
0–255
0–255
0–255
0–255
0–2
0.02 second
0.1 second
AN93
seconds
seconds
seconds
minutes
Units
–
89