SI3220DC0-EVB Silicon Laboratories Inc, SI3220DC0-EVB Datasheet - Page 55
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SI3220DC0-EVB
Manufacturer Part Number
SI3220DC0-EVB
Description
DAUGHTER CARD W/SI3200 INTERFACE
Manufacturer
Silicon Laboratories Inc
Series
ProSLIC®r
Datasheet
1.SI3200-G-FSR.pdf
(112 pages)
Specifications of SI3220DC0-EVB
Main Purpose
Interface, Analog Front End (AFE)
Utilized Ic / Part
Si3220
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
- Current page: 55 of 112
- Download datasheet (2Mb)
3.15.1. Ringtrip Timeout Counter
The Dual ProSLIC incorporates a ringtrip timeout
counter, RTCOUNT, that will monitor the status of the
ringing control. When exiting ringing, the Dual ProSLIC
will allow the ringtrip timeout counter a sufficient amount
of time (RTCOUNT x 1.25 ms/LSB) for the mode to
switch to On-hook Transmission or Active. The mode
that is being exited to is governed by whether the
command to exit ringing is a ringing active timer
expiration (on-hook transmission) or ringtrip/manual
ILOOP
Processor
Signal
Input
LFS
Figure 27. Ring Trip Detect Processing Circuitry
Full Wave
Rectifier
Digital
LPF
RTPER
Digital
LPF
AC Ring Trip
DC Ring Trip
Threshold
Threshold
RTDCTH
RTACTH
Rev. 1.3
_
+
+
_
mode change (active mode). The ringtrip timeout
counter ensures ringing is exited within its time setting
(RTCOUNT x 1.25 ms/LSB, typically 200 ms).
3.15.2. Ringtrip Debounce Interval
The ac and dc ring trip debounce intervals can be
calculated based on the following equations:
RTACDB = t
RTDCDB = t
Si3220/25 Si3200/02
Debounce
Filter_AC
RTACDB
debounce
debounce
Debounce
Filter_DC
RTDCDB
(1600/RTPER)
(1600/RTPER)
Interrupt
RTRIPE
Logic
RTP
RTRIPS
55
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