SI3201-KS Silicon Laboratories Inc, SI3201-KS Datasheet - Page 40

• Manufacturer Part Number: SI3201-KS
• Description: IC LINEFEED INTRFC SI321X 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3201-KS

• Package / Case: 16-SOIC (3.9mm Width) Exposed Pad, 16-eSOIC, 16-HSOIC
• Function: CODEC
• Interface: PCM, Serial, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3.13 V ~ 5.25 V
• Current - Supply: 88mA
• Power (watts): 800mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Includes: BORSCHT Functions, Ring Trip Detection
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 88 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si3210/Si3211
2.3.2. Oscillator Frequency and Amplitude
Each of the two tone generators contains a two-pole
resonate
frequency and amplitude, which are programmed via
indirect registers OSC1, OSC1X, OSC1Y, OSC2,
OSC2X, and OSC2Y. The sample rate for the two
oscillators is 8000 Hz. The equations are as follows:
where f
where desired Vrms is the amplitude to be generated;
n = 1 or 2 for oscillator 1 or oscillator 2, respectively.
For example, in order to generate a DTMF digit of 8, the
two required tones are 852 Hz and 1336 Hz. Assuming
the generation of half-scale values (ignoring twist) is
desired, the following values are calculated:
40
OSC1X
OSCnX
n
OSC1
is the frequency to be generated;
=
=
oscillator
Counter
1
-- -
4
coeff
Modulo
1
-- -
4
16-Bit
*Tone Generator 1 Only
n = "1" or "2" for Tone Generator 1 and 2, respectively
8 kHz
OATn
Clock
OITn
coeff


=
OSCn = coeff
0.21556
-------------------- -
1.78434
1
1 coeff
----------------------- -
1
0.78434 2
n
+
–
=
OATnE
= cos(2f
OITnE
coeff
cos
OSCnY = 0,
circuit




2852
---------------- -
Expire
Expire

8000

OAT
OIT
15
2
OnE

15
2

Figure 20. Simplified Tone Generator Diagram
15
n
n
–
with
=
/8000 Hz),


x (2
–
1
25701
Cross
1
=

Logic
Zero


Logic
Logic
15
0.78434

INT
INT
0.5
a
);
Desired V
------------------------------------ -
=
OZn
1.11 V
=
6465h
programmable
1424
Zero Cross
OSSn
Logic
Load
OnAE
OnAP
OnIE
OnIP
rms
=
rms
590h
REL*
Rev. 1.45
Register
Enable
Load
Resonance
The above computed values would be written to the
corresponding registers to initialize the oscillators. Once
the oscillators are initialized, the oscillator control
registers can be accessed to enable the oscillators and
direct their outputs.
2.3.3. Tone Generator Cadence Programming
Each of the two tone generators contains two timers,
one for setting the active period and one for setting the
inactive period. The oscillator signal is generated during
the active period and suspended during the inactive
period. Both the active and inactive periods can be
programmed from 0 to 8 seconds in 125 µs steps. The
active period time interval is set using OAT1 (direct
registers 36 and 37) for tone generator 1 and OAT2
(direct registers 40 and 41) for tone generator 2.
To enable automatic cadence for tone generator 1,
define the OAT1 and OIT1 registers and then set the
O1TAE bit (direct Register 32, bit 4) and O1TIE bit
(direct Register 32, bit 3). This enables each of the
timers to control the state of the Oscillator Enable bit,
O1E (direct Register 32, bit 2). The 16-bit counter will
begin counting until the active timer expires, at which
Two-Pole
Oscillator
8 kHz
Clock
OSC2X
OSCnX
OSCnY
OSCn
OSC2 = 0.49819 (2
=
coeff
1
-- -
4

2
0.50181
-------------------- -
1.49819
=
cos
OSC1Y = 0
OSC2Y = 0
Routing


Signal

21336
------------------- -
8000

15
2
15
) = 16324 = 3FC4h
–
OnSO


1

=

0.5
0.49819
to TX Path
to RX Path
=
2370
=
942h