SI3211 ETC, SI3211 Datasheet - Page 34

• Manufacturer Part Number: SI3211
• Description: PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION
• Manufacturer: ETC

Si 3210/ Si3 211/S i32 12
When
LF[2:0] = 100 (direct Register 64), the ProSLIC will go
into the ringing state and start the first ring. At the
expiration of RAT, the ProSLIC will turn off the ringing
waveform and will go to the on-hook transmission state.
At the expiration of RIT, ringing will again be initiated.
This process will continue as long as the two timers are
enabled and the Linefeed Control register is set to the
ringing state.
Sinusoidal Ringing
To configure the ProSLIC for sinusoidal ringing, the
frequency and amplitude are initialized by writing to the
following indirect registers: RCO, RNGX, and RNGY.
The equations for RCO, RNGX, RNGY are as follows:
where
34
Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
Common Mode Bias Adjust During Ringing
Linefeed Control (Initiates Ringing State)
Ringing Oscillator Inactive Timer
Ringing Oscillator Active Timer
the
Ringing Voltage Offset Enable
Ringing Inactive Timer Enable
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through
31).
Ringing Active Timer Enable
Ringing Oscillator Enable
Ringing dc voltage offset
High Battery Voltage
Ringing initial phase
ringing
Ringing Waveform
Ringing frequency
Ringing amplitude
coeff
Parameter
RCO
state
=
=
cos
coeff


---------------------- -
1000 Hz
is invoked
Table 28. Registers for Ringing Generation
2 f
2
15


by
Preliminary Rev. 1.11
Ringing State = 100b
sinewave and period
Range/ Description
Sets initial phase for
writing
Sine/Trapezoid
15 to 100 Hz
0 to –94.5 V
0 to 94.5 V
0 to 94.5 V
0 to 22.5 V
0 to 8 sec
0 to 8 sec
trapezoid
Enabled/
Enabled/
Enabled/
Enabled/
Disabled
Disabled
Disabled
Disabled
for
and f = desired ringing frequency in hertz.
In selecting a ringing amplitude, the peak TIP-to-RING
ringing voltage must be greater than the selected on-
hook line voltage setting (VOC, direct Register 72). For
example, to generate a 70 V
equations are as follows:
RNGX
RNGX
RCO
=
1
-- -
4
coeff
=
=
RNGX[15:0]
RNGY[15:0]
VBATH[5:0]
ROFF[15:0]
VCMR[3:0]
RCO[15:0]
RAT[15:0]
1
-- -
4
1 coeff
----------------------- - 2
1
RIT[15:0]
Register
0.99211
LF[2:0]
TSWS
–
+
RTAE
RVO
RTIE
ROE
Bits
=
coeff
0.00789
--------------------- 2
1.99211
cos
RNGY
RNGY


---------------------- -
1000 Hz
2
2
15
15
PK
15
Desired V
----------------------------------------------------------------------- -
20
Direct Registers 48 and
Direct Registers 50 and
=
=
=
20 Hz ringing signal, the
Indirect Register 19
Indirect Register 20
Indirect Register 21
Indirect Register 22
Indirect Register 40
0
0
32509
Direct Register 34
Direct Register 34
Direct Register 34
Direct Register 34
Direct Register 34
Direct Register 74
Direct Register 64


70
------
96
=
=
0.99211
Location
376
=
PK
96 V
49
51
7EFDh
=
0 to 94.5 V
0177h