SI2493-D-FS Silicon Laboratories Inc, SI2493-D-FS Datasheet - Page 163

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

Specifications of SI2493-D-FS

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

The ISOmodem has an internal analog-to-digital converter used to monitor the loop voltage when on-hook and
loop current when off-hook to check for parallel devices going off-hook. The host measures loop voltage or current
by reading U79 [4:0] (LVCS). To set the ISOmodem to monitor loop voltage in the on-hook state, the host issues
the following commands:
To set the ISOmodem to monitor loop current, the host issues the following commands:
Register Bit(s)
U70
U70
U76
U76
U76
U76
U77
U77
U78
U78
U79
U83
U84
U85
Command
Command
AT:R79
AT:R79
Table 102. Intrusion Detection
ATH1
15:12
15:14
15:9
15:0
15:0
15:0
7:5
4:0
7:0
4:0
10
11
2
8
PPDM
OHSR
NOLN
Name
LVCS
FACL
NLIU
LIUS
PPD
DCL
ACL
HOI
IST
IB
IS
Rev. 1.3
Function
Function
Host reads the loop voltage
from the LVCS Register U79
bits 4:0 while the modem is
on-hook.
To go off-hook
Host reads loop current from
the LVCS Register U79 bits
4:0 while the modem is off-
hook.
Function
Parallel Phone Detect
Mask
Parallel Phone Detect
Off-Hook Sample Rate
Force ACL
Differential Current
Level
Intrusion Settling Time
Hang-Up On Intrusion
Intrusion Blocking
Line Voltage/Current
Sense
No Line Threshold %V1
Line-in-use Threshold
%V1
Line-in-use/No Line
Threshold %V2
Absolute Current Level
Intrusion Suspend
AN93
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