SI3200-KS Silicon Laboratories Inc, SI3200-KS Datasheet - Page 24

• Manufacturer Part Number: SI3200-KS
• Description: IC LINEFEED INTRFC 100V 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3200-KS

• Package / Case: 16-SOIC (3.9mm Width)
• Function: Subscriber Line Interface Concept (SLIC), CODEC
• Interface: GCI, PCM, SPI
• Number Of Circuits: 2
• Voltage - Supply: 3.3V, 5V
• Current - Supply: 110µA
• Power (watts): 941mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Includes: Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 0.11 mA, 8.4 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Number Of Channels: 2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si3232
Figure 8 illustrates the linefeed characteristics for a
typical application using an I
a TIP-RING open circuit voltage (V
VOC and VOCTRACK RAM locations are used to
program the TIP-RING voltage, and these two values
are equal provided that V
the battery voltage drops below that point, VOCTRACK
decreases at the same rate as V
sufficient headroom to accommodate both V
levels below V
The equation for calculating the RAM address value for
VOC, VCM, VOCDELTA, VOV, VOVRING, RINGOF,
VOCLTH, and V
function rounds up the result to the next integer.
For example, to program a VOC value of 51 V:
During the on-hook state, the Si3232 is in the constant-
voltage operating area and typically presents a 640 Ω
output impedance (Figure 8). The Si3232 includes a
special modified linefeed scheme that adjusts the
ProSLIC’s output impedance based on the linefeed
voltage level in order to ensure the ability to source
extended loop lengths. When the terminal equipment
transitions to the off-hook state, the linefeed voltage
typically collapses and transitions through the preset
threshold voltage causing the Si3232 to reduce its
output impedance to 320 Ω. The TIP-RING voltage will
then continue decreasing until the preset loop current
limit (I
detection thresholds are programmable, and internal
24
VOC
Figure 9. V
RAM VALUE
2
LIM
=
×
2 CEILING ROUND
CEILING ROUND
) setting is reached. Loop closure and ring trip
×
–20
–40
–60
Ground Start Operation
0
BAT
RING
OCHTH
⎛
⎝
R
.
=
O
= 600 Ω
⎛
⎝
10
vs. I
I
is shown below. The CEILING
RING
BAT
⎛
⎝
RING
desired voltage
--------------------------------------- -
20
(mA)
⎛
⎝
LOOP
> V
R
------------------- -
1.005 V
1.005V
O
51 V
= 320 Ω
Characteristic for
OC
Loop Closure
BAT
30
Threshold
setting of 24 mA and
I
LIM
+ V
⎞
⎠
in order to provide
= 24 mA
OC
×
OV
40
512
--------- -
) of 48 V. The
⎞
⎠
5
×
+ V
⎞
⎠
512
--------- -
OV
5
50
=
CM
Preliminary Rev. 0.96
and V
⎞
⎠
28CEh
. When
CM
debouncing is provided. A high-gain common-mode
loop generates a low impedance from TIP or RING to
ground, effectively reducing the effects of longitudinal
interference.
For ground-start operation, the active lead presents a
640 Ω output impedance during the on-hook state and a
320 Ω output impedance in the off-hook state. The
“open” lead presents a high-impedance feed (>150 kΩ).
Figure 9 illustrates a typical ground-start application
using V
state.
debouncing interval are both programmable.
The modified linefeed scheme also allows the user to
modify the apparent V
boosting the linefeed voltage when the battery voltage
drops below a certain level. Figure 10 illustrates a
typical Si3232 application sourcing a loop from a 48 V
battery. For V
VOCTRACK RAM location will be set to 42 V when
given a programmed value of 42 V for the VOC RAM
location. When a loop closure event occurs, the TIP-
RING voltage decreases linearly until it reaches a
preset voltage threshold that is lower than VOCTRACK
by an amount programmed into the VOCLTH RAM
location. Exceeding this threshold causes the Dual
ProSLIC to increase its “target” V
programmed into the VOCDELTA RAM location to
provide additional overhead for driving the higher-
impedance loop. In the on-hook condition, the TIP-
RING voltage increases linearly until it rises above a
second preprogrammed voltage threshold, which is
higher than VOCTRACK by an amount programmed
into the VOCHTH RAM location. This scheme offers the
ability to drive very long loop lengths while using the
lowest possible battery voltage. Consult the factory for
optimal register and RAM location settings for specific
applications.
Figure 10. V
OC
The
VOCDELTA
using Modified Linefeed Scheme
V
V
VOCTRACK
TIP
= 48 V and I
OC
–
50
40
30
20
10
ring
RING
0
TIP–RING
OV
R
O
(V)
= 600 Ω
ground-detection
and V
LIM
10
OC
vs. I
load line
1930 Ω
= 24 mA in the TIP OPEN
CM
voltage as a means of
LOOP
OC
20
values of 3 V, the
R
O
Characteristics
level by an amount
= 320 Ω
I
threshold
LIM
(mA)
and