SI3230MPPQX-EVB Silicon Laboratories Inc, SI3230MPPQX-EVB Datasheet - Page 20

• Manufacturer Part Number: SI3230MPPQX-EVB
• Description: BOARD EVAL W/DISCRETE INTERFACE
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3230MPPQX-EVB

• Main Purpose: Interface, Analog Front End (AFE)
• Utilized Ic / Part: Si3230
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Si3230
2.1.5. Power Monitoring and Line Fault Detection
In addition to reporting voltages and currents, the
ProSLIC continuously monitors the power dissipated in
each external bipolar transistor. Realtime output power
of any one of the six linefeed transistors can be read by
setting the Power Monitor Pointer (direct Register 76) to
point to the desired transistor and then reading the Line
Power Output Monitor (direct Register 77).
The realtime power measurements are low-pass filtered
and compared to a maximum power threshold.
Maximum power thresholds and filter time constants are
software programmable and should be set for each
transistor pair based on the characteristics of the
transistors used. Table 22 describes the registers
associated with this function. If the power in any
external transistor exceeds the programmed threshold,
a power alarm event is triggered. The ProSLIC sets the
Power Alarm register bit, generates an interrupt (if
enabled), and automatically enters the Open state (if
AOPN = 1).
transistors from fault conditions and, combined with the
loop voltage and current monitors, allows diagnosis of
20
*Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
Battery Voltage Sense 1 (V
Battery Voltage Sense 2 (V
Loop Voltage Sense (V
Transistor 1 Current Sense
Transistor 2 Current Sense
Transistor 3 Current Sense
Transistor 4 Current Sense
Transistor 5 Current Sense
Transistor 6 Current Sense
directly.
RING Voltage Sense
Loop Current Sense
TIP Voltage Sense
Parameter
This
V
RING
Table 21. Measured Realtime Linefeed Interface Characteristics
)
feature
TIP
BAT
BAT
protects
–
)
)
–78.75 to +78.5 mA
–94.5 to +94.5 V
Measurement
the
0 to 81.35 mA
0 to 81.35 mA
0 to 80.58 mA
0 to 80.58 mA
0 to –95.88 V
0 to –95.88 V
0 to –95.88 V
0 to –95.88 V
0 to 9.59 mA
0 to 9.59 mA
Range
Preliminary Rev. 0.96
external
the type of fault condition present on the line.
The value of each thermal low-pass filter pole is set
according to the equation:
where τ is the thermal time constant of the transistor
package, 4096 is the full range of the 12-bit register, and
800 is the sample rate in hertz. Generally τ = 3 seconds
for SOT223 packages and τ = 0.16 seconds for SOT23,
but check with the manufacturer for the package
thermal constant of a specific device. For example, the
power alarm threshold and low-pass filter values for Q5
and Q6 using a SOT223 package transistor are
computed as follows:
Thus, indirect Register 34 should be set to 150Dh.
Note: The power monitor resolution for Q3 and Q4 is different
PT56
Resolution
0.319 mA
0.319 mA
0.316 mA
0.316 mA
1.25 mA
0.376 V
0.376 V
0.376 V
0.376 V
37.6 µA
37.6 µA
from that of Q1, Q2, Q5, and Q6.
1.5 V
=
------------------------------ -
Resolution
thermal LPF register
P
MAX
VBATS1[7:0]
VBATS2[7:0]
VRING[7:0]
VTIP[7:0]
×
Register
LCS[5:0]
LVS[6:0]
IQ1[7:0]
IQ2[7:0]
IQ3[7:0]
IQ4[7:0]
IQ5[7:0]
IQ6[7:0]
LCSP,
2
LVSP,
Bits
7
=
----------------- -
0.0304
1.28
=
------------------
800 τ
×
4096
Direct Register 78
Direct Register 79
Direct Register 80
Direct Register 81
Direct Register 82
Direct Register 83
Direct Register 84
Direct Register 85
Direct Register 86
Direct Register 87
Direct Register 88
Direct Register 89
2
7
×
=
Location*
×
5389
2
3
=
150D