SI3211PPTX-EVB Silicon Laboratories Inc, SI3211PPTX-EVB Datasheet - Page 32
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SI3211PPTX-EVB
Manufacturer Part Number
SI3211PPTX-EVB
Description
BOARD EVAL W/DISCRETE INTERFACE
Manufacturer
Silicon Laboratories Inc
Series
ProSLIC®r
Specifications of SI3211PPTX-EVB
Main Purpose
Interface, Analog Front End (AFE)
Utilized Ic / Part
Si3211
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Si3210/Si3211
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. Real-time 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 real-time 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 25 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). This feature protects the external transistors from fault conditions and, combined with the loop
voltage and current monitors, allows diagnosis of 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 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 = 3 seconds for SOT223 packages and = 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.
32
*Note: The ProSLIC uses registers that are both directly and indirectly mapped.
Loop Voltage Sense (V
Battery Voltage Sense 1 (V
Battery Voltage Sense 2 (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
A “direct” register is one that is mapped directly.
RING Voltage Sense
Loop Current Sense
TIP Voltage Sense
Parameter
Table 24. Measured Real-Time Linefeed Interface Characteristics
TIP
– V
BAT
BAT
RING
)
)
)
Thermal LPF register
–78.75 to +78.5 mA
–94.5 to +94.5 V
Measurement
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
Rev. 1.5
=
Resolution
------------------
800
0.319 mA
0.319 mA
0.316 mA
0.316 mA
4096
1.25 mA
0.376 V
0.376 V
0.376 V
0.376 V
37.6 µA
37.6 µA
1.5 V
2
3
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,
LVSP,
Bits
Direct Register 78
Direct Register 79
Direct Register 81
Direct Register 82
Direct Register 83
Direct Register 80
Direct Register 84
Direct Register 85
Direct Register 86
Direct Register 87
Direct Register 88
Direct Register 89
Location*
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