Si3232
38
Preliminary Rev. 0.96
4.6.1. Internal Sinusoidal Ringing
A sinusoidal ringing waveform is generated by using an
on-chip digital tone generator. The tone generator used
to generate ringing tones is a two-pole resonator with a
programmable frequency and amplitude. Since ringing
frequencies are low compared to the audio band
signaling frequencies, the sinusoid is generated at a
1 kHz rate. The ringing generator is programmed via the
RINGFREQ,
RINGAMP,
locations. The equations are as follows:
and
RINGPHAS
RAM
For example, to generate a 60 V
rms
(87 V
PK
), 20 Hz
ringing signal, the equations are as follows:
Table 23. Register and RAM Locations used for Ringing Generation
Parameter
Register/RAM
Mnemonic
Register/RAM
Bits
Programmable
Range
Resolution
(LSB Size)
Ringing Waveform
RINGCON
TRAP
Sinusoid/Trapezoid
N/A
Ringing Active Timer Enable
RINGCON
TAEN
Enabled/Disabled
N/A
Ringing Inactive Timer Enable
RINGCON
TIEN
Enabled/Disabled
N/A
Ringing Oscillator Enable Monitor
RINGCON
RINGEN
Enabled/Disabled
N/A
Ringing Oscillator Active Timer
RINGTALO/
RINGTAHI
RINGTA[15:0]
0 to 8.19 s
125 ms
Ringing Oscillator Inactive Timer
RINGTILO/
RINGTIHI
RINGTI[15:0]
0 to 8.19 s
125 ms
Linefeed Control (Initiates Ringing
State)
LINEFEED
LF[2:0]
000 to 111
N/A
On-Hook Line Voltage
VOC
VOC[15:0]
0 to 63.3 V
1.005 V
(4.907 mV)
Ringing Voltage Offset
RINGOF
RINGOF[15:0]
0 to 63.3 V
1.005 V
(4.907 mV)
Ringing Frequency
RINGFRHI/
RINGFRLO
RINGFRHI[14:3]/
RINGFRLO[14:3]
4 to 100 Hz
Ringing Amplitude
RINGAMP
RINGAMP[15:0]
0 to 160.173 V
628 mV
(4.907 mV)
Ringing Initial Phase
Sinusoidal
Trapezoid
RINGPHAS
RINGPHAS[15:0]
N/A
0 to 1.024 s
N/A
31.25
μ
s
Ringing Overhead Voltage
VOVRING
VOVRING[15:0]
0 to 63.3 V
1.005 V
(4.907 mV)
Ringing Speedup Timer
SPEEDUPR
SPEEDUPR[15:0]
0 to 40.96 s
1.25 ms
coeff
1000 Hz
----------------------
cos
=
RINGFREQ
coeff
2
23
×
=
RINGAMP
1
4
--
1
coeff
+
-----–
2
15
(
)
×
Desired V
160.173 V
-----------------------------------
×
=
RINGPHAS
0
=
coeff
1000 Hz
----------------------
.
99211
=
cos
=
RINGFREQ
.
99211
2
23
(
)
×
8322461
0x7EFD9D
=
=
=
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