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| 型號： | SI3216MPPT1-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 47/122頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL W/SI3201 INTERFACE |
| 標(biāo)準(zhǔn)包裝： | 1 |
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Si3216
30
Rev. 1.0
Not
Recommended
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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 24 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 following 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 thermal time
constant of a specific device. For example, the power
alarm threshold and low-pass filter values for Q5 and
Q6 using an 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
from that of Q1, Q2, Q5, and Q6.
Table 23. Measured Real Time Linefeed Interface Characteristics
Parameter
Measurement
Range
Resolution
Register
Bits
Location*
Loop Voltage Sense (VTIP – VRING)
–94.5 to +94.5 V
1.5 V
LVSP,
LVS[6:0]
Direct Register 78
Loop Current Sense
–80 to +80 mA
1.27 mA
LCSP,
LCS[5:0]
Direct Register 79
TIP Voltage Sense
0 to –95.88 V
0.376 V
VTIP[7:0]
Direct Register 80
RING Voltage Sense
0 to –95.88 V
0.376 V
VRING[7:0]
Direct Register 81
Battery Voltage Sense 1 (VBAT)
0 to –95.88 V
0.376 V
VBATS1[7:0]
Direct Register 82
Battery Voltage Sense 2 (VBAT)
0 to –95.88 V
0.376 V
VBATS2[7:0]
Direct Register 83
Transistor 1 Current Sense
0 to 81.35 mA
0.319 mA
IQ1[7:0]
Direct Register 84
Transistor 2 Current Sense
0 to 81.35 mA
0.319 mA
IQ2[7:0]
Direct Register 85
Transistor 3 Current Sense
0 to 9.59 mA
37.6 A
IQ3[7:0]
Direct Register 86
Transistor 4 Current Sense
0 to 9.59 mA
37.6 A
IQ4[7:0]
Direct Register 87
Transistor 5 Current Sense
0 to 80.58 mA
0.316 mA
IQ5[7:0]
Direct Register 88
Transistor 6 Current Sense
0 to 80.58 mA
0.316 mA
IQ6[7:0]
Direct Register 89
*Note: The ProSLIC uses registers that are both directly and indirectly mapped. A direct register is one that is mapped
directly.
thermal LPF register
4096
800
------------------
2
3
=
PPT56
P
MAX
Resolution
-------------------------------
2
7
1.28
0.0304
------------------
2
7
5389
150Dh
==
=
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