SI3215-C-FM Silicon Laboratories Inc, SI3215-C-FM Datasheet - Page 24

• Manufacturer Part Number: SI3215-C-FM
• Description: IC SLIC/CODEC 1CH 38QFN
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3215-C-FM

• Package / Case: *
• Function: Subscriber Line Interface Concept (SLIC), CODEC
• Interface: PCM, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3.13 V ~ 5.25 V
• Current - Supply: 88mA
• Power (watts): 700mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Includes: Audio Tone Generation, BORSCHT Functions, FSK Generation, Voice Loopback Test Modes
• 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
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si3215
2.2.1. DC Feed Characteristics
The ProSLIC has programmable constant voltage and
constant current zones as depicted in Figure 14. Open
circuit TIP-to-RING voltage (V
voltage zone and is programmable from 0 V to 94.5 V in
1.5 V steps. The loop current limit (I
constant current zone and is programmable from 20 mA
to 41 mA in 3 mA steps. The ProSLIC has an inherent
dc output resistance (R
The TIP-to-RING voltage (V
a programmable voltage (V
headroom to the positive-most terminal (TIP in forward
polarity states and RING in reverse polarity states) for
carrying audio signals. Table 20 summarizes the
parameters to be initialized before entering an active
state.
24
*Note: The ProSLIC uses registers that are both directly and
Parameter
Figure 14. Simplified DC Current/Voltage Linefeed
V
V
V
I
LIM
(TIP-RING )
CM
OC
Table 20. Programmable Ranges of DC
indirectly mapped. A “direct” register is one that is mapped
directly.
V
Programmable
O C
(V)
Linefeed Characteristics
20 to 41 mA
0 to 94.5 V
0 to 94.5 V
Range
Characteristic
R
Constant
Voltage
O
O
Zone
=160
) of 160 Ω .
Default
20 mA
Value
OC
48 V
3 V
Ω
CM
OC
) is offset from ground by
I
LIM
) defines the constant
) to provide voltage
Constant Current
VOC[5:0]
VCM[5:0]
Register
ILIM[2:0]
Bits
LIM
I
LO O P
Zone
) defines the
(m A)
Register 71
Register 72
Register 73
Location*
Direct
Direct
Direct
Rev. 0.92
2.2.2. Linefeed Architecture
The ProSLIC is a low-voltage CMOS device that uses
either an Si3201 linefeed interface IC or low-cost
external components to control the high voltages
required for subscriber line interfaces. Figure 15 is a
simplified illustration of the linefeed control loop circuit
for TIP or RING and the external components used.
The ProSLIC uses both voltage and current sensing to
control TIP and RING. DC and AC line voltages on TIP
and RING are measured through sense resistors R
and R
Q
base of Q
The ProSLIC measures voltage at various nodes in
order to monitor the linefeed current. R
R
sense circuitry is calibrated on-chip to guarantee
measurement
component
Calibration" on page 29 for details.
2.2.3. Linefeed Operation States
The ProSLIC linefeed has eight states of operation as
shown in Table 21. The state of operation is controlled
using the Linefeed Control register (direct Register 64).
The open state turns off all currents into the external
bipolar transistors and can be used in the presence of
fault conditions on the line and to generate Open Switch
Intervals (OSIs). TIP and RING are effectively tri-stated
with a dc output impedance of about 150 k Ω . The
ProSLIC can also automatically enter the open state if it
detects excessive power being consumed in the
external
Monitoring and Line Fault Detection" on page 27 for
more details.
In the forward active and reverse active states, linefeed
circuitry is on, and the audio signal paths are powered
down.
In the forward and reverse on-hook transmission states,
audio signal paths are powered up to provide data
transmission during an on-hook loop condition.
The TIP Open state turns off all control currents to the
external bipolar devices connected to TIP and provides
an active linefeed on RING for ground start operation.
The RING Open state provides similar operation with
the RING drivers off and TIP active.
The
waveforms onto the line.
BAT
N
to drive TIP and RING. Q
AC
provide access to these measuring points. The
ringing
. The ProSLIC uses linefeed transistors Q
N
bipolar
from the ProSLIC.
tolerances.
state
accuracy
transistors.
drives
DN
with
See
isolates the high-voltage
programmable
See
standard
"2.2.9.
"2.2.5.
DC
, R
Linefeed
external
SE
ringing
Power
P
, and
and
DC