SI3200-BS Silicon Laboratories Inc, SI3200-BS Datasheet - Page 26

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

Specifications of SI3200-BS

• 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
• Package / Case: 16-SOIC (3.9mm Width)
• Includes: Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si3232
4.4.2. Loop Voltage and Current Monitoring
The Si3232 continuously monitors the TIP and RING
voltages and currents. These values are available to the
user in registers. An internal 8-bit A/D converter
samples the measured voltages and currents from the
analog sense circuitry and translates them into the
digital domain. The A/D updates the samples at an
800 Hz rate. Two derived values, the loop voltage
(V
For ground start operation, the values reported are
V
Table 14 lists the register set associated with the loop
monitoring functions.
The Si3232 also includes the ability to perform loop
diagnostics functions as outlined in "4.18.2. Line Test
and Diagnostics" on page 57.
4.4.3. Power Monitoring and Power Fault Detection
The Si3232 line monitoring functions can be used to
26
RING
Table 15. Register Values for CM Calibration
TIP
– V
Register
and the current flowing in the RING lead.
Name
ZRS
RING
ZZ
(600 Ω Impedance Synthesis)
) and the loop current are also reported.
R6*gain
RBQ6
ITIPN
Q10
(decimal)
Location
Register
Q4
1.74k
Figure 11. Discrete Linefeed Circuit for Power Monitoring
33
34
Q8
(hexadecimal)
Register
ITIPP
Value
0x5
0x1
Q1
Q6
R6
82.5
Preliminary Rev. 0.96
TIP
protect the high-voltage circuitry against excessive
power dissipation and thermal-overload conditions. The
Si3232 also has the ability to prevent thermal overloads
by regulating the total power inside the Si3200 or in
each of the external bipolar transistors (if using a
discrete linefeed circuit). The DSP engine performs all
power
automatically transition the device into the OPEN state
and generate a power alarm interrupt when excessive
power is detected. Table 16 describes the register and
RAM locations used for power monitoring.
4.4.4. Transistor Power Equations
When using the Si3232 along with discrete bipolar
transistors, it is possible to control the total power of the
solution by regulating the power in each discrete
transistor individually. Figure 11 illustrates the basic
transistor-based linefeed circuit for one channel. The
power dissipation of each external transistor is
estimated based on the A/D sample values. The
approximate power equations for each external BJT are
as follows:
P
P
P
P
P
P
RING
Q1
Q2
Q3
Q4
Q5
Q6
≅ V
≅ V
≅ V
≅ V
≅ V
≅ V
82.5
R7
Q2
Q5
(Using Discrete Transistors)
CE1
CE2
CE3
CE4
CE5
CE6
calculations
IRINGP
x I
x I
x I
x I
x I
x I
Q1
Q2
Q3
Q4
Q5
Q6
≅ (|V
≅ (|V
≅ (|V
≅ (|V
≅ (|V
≅ (|V
Q7
TIP
RING
BAT
BAT
BAT
BAT
and
| + 0.75 V) x (I
| – R7 x I
| – R6 x I
| – |V
| – |V
1.74k
| + 0.75 V) x (I
Q3
provides
Q9
RING
TIP
IRINGN
RBQ5
R7*gain
| – R6 x I
Q5
Q6
| – R7 x I
) x (I
) x (I
Q1
the
Q2
Q3
Q4
)
VBAT
Q6
)
)
)
Q5
) x (I
ability
) x (I
Q6
Q5
)
)
to