Si3210/Si3211/Si3212
Table 29. Associated Registers for Ring Trip Detection
Register
Parameter
Location
Ring Trip Interrupt Pending
Ring Trip Interrupt Enable
Ring Trip Detect Debounce Interval
Ring Trip Threshold
RTIP
RTIE
Direct Register 19
Direct Register 22
Direct Register 70
Indirect Register 29
Indirect Register 36
Direct Register 68
RTDI[6:0]
RPTP[5:0]
NRTP[12:0]
RTP
Ring Trip Filter Coefficient
Ring Trip Detect Status (monitor only)
Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through
31).
Table 30. Recommended Ring Trip Values for Ringing
Ringing
NRTP
RPTP
RTDI
Frequency
Hz
16.667
20
decimal
64
hex
decimal
34 mA
34 mA
34 mA
34 mA
34 mA
34 mA
hex
decimal
15.4 ms
12.3 ms
8.96 ms
7.5 ms
5 ms
hex
0F
0B
09
07
05
05
0200
0320
0380
0400
06A8
0800
3600
3600
3600
3600
3600
3600
100
112
30
40
128
213
256
50
60
4.8 ms
Pulse Metering Generation
Desired VRMS
1
4
--
----------------------------------------------
PLSX =
----------------------- (215 – 1)
1 – coeff
There is an additional tone generator suitable for
generating tones above the audio frequency. This
oscillator is provided for the generation of billing tones
which are typically 12 kHz or 16 kHz. The generator
follows the same algorithm as described in "Tone
Full Scale VRMS
1 + coeff
where full scale V
= 0.85 V
for a matched load.
RMS
RMS
The initial phase of the pulse metering signal is set to 0
internally so there is no register to serve this purpose.
Generation" on page 30 with the exception that the The pulse metering generator timers and associated
sample rate for computation is 64 kHz instead of 8 kHz. pulse metering timer registers are similar to that of the
The equations are as follows:
tone generators. These timers count 8 kHz sample
periods like the other tones even though the sinusoid is
generated at 64 kHz.
2πf
-------------------------
coeff = cos
64000 Hz
PLSCO = coeff (215 – 1)
Preliminary Rev. 1.11
37
ETC [ ETC ]
