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參數(shù)資料
型號: 71M6543GH-IGTR/F
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP100
封裝: LEAD FREE, LQFP-100
文件頁數(shù): 33/157頁
文件大小: 2178K
代理商: 71M6543GH-IGTR/F
71M6543F/H and 71M6543G/GH Data Sheet
128
2008–2011 Teridian Semiconductor Corporation
v1.2
the source for pulse generation in APULSEW and APULSER to generate pulses. Irrespective of the
EXT_PULSE status, the output pulse rate controlled by APULSEW and APULSER is implemented by the CE
only. By setting EXT_PULSE = 1, the MPU is providing the source for pulse generation. If EXT_PULSE is 0,
W0SUM_X and VAR0SUM_X are the default pulse generation sources. In this case, creep cannot be
controlled since it is an MPU function.
The maximum pulse rate is 3*FS = 7.5 kHz.
See 2.3.6.2 VPULSE and WPULSE (page 27) for details on how to adjust the timing of the output pulses.
The maximum time jitter is 1/6 of the multiplexer cycle period (nominally 67 s) and is independent of the
number of pulses measured. Thus, if the pulse generator is monitored for one second, the peak jitter is
67 ppm. After 10 seconds, the peak jitter is 6.7 ppm. The average jitter is always zero. If it is attempted
to drive either pulse generator faster than its maximum rate, it simply outputs at its maximum rate without
exhibiting any rollover characteristics. The actual pulse rate, using WSUM as an example, is:
Hz
X
F
WSUM
WRATE
RATE
S
46
2
=
,
where FS = sampling frequency (2184.53 Hz), X = Pulse speed factor derived from the CE variables
PULSE_SLOW (CE RAM 0x20[0]) and PULSE_FAST (CE RAM 0x20[1]).
Table 85: CE Pulse Generation Parameters
CE
Address
Name
Default
Description
0x21
WRATE
227
Kh = VMAX*IMAX*K / (WRATE*NACC*X) Wh/pulse
where:
K = 76.3594 when used with local sensors (CT or shunt)
K = 54.5793 when used with 71M6xx3 remote sensors
0x22
KVAR
6444
Scale factor for VAR measurement.
0x23
SUM_PRE
2184
Number of samples per accumulation interval, as specified in
SUM_SAMPS[12:0], I/O RAM 0x2107[4:0], 0x2108[7:0] (NACC).
0x45
APULSEW
0
Wh pulse (WPULSE) generator input to be updated by the MPU
when using external pulse generation. The output pulse rate is:
APULSEW * FS * 2
-32 * WRATE * X * 2-14.
This input is buffered and can be updated by the MPU during a
conversion interval. The change takes effect at the beginning of
the next interval.
0x46
WPULSE_CTR
0
Counter for WPULSE output.
0x47
WPULSE_ FRAC
0
Unsigned numerator, containing a fraction of a pulse. The value
in this register always counts up towards the next pulse.
0x48
WSUM_ ACCUM
0
Roll-over accumulator for WPULSE.
0x49
APULSER
0
VARh (VPULSE) pulse generator input.
0x4A
VPULSE_CTR
0
Counter for VPULSE output.
0x4B
VPULSE_ FRAC
0
Unsigned numerator, containing a fraction of a pulse. The value
in this register always counts up towards the next pulse.
0x4C
VSUM_ACCUM
0
Roll-over accumulator for VPULSE.
Other CE Parameters
Table 86 shows the QUANT CE parameters used for suppression of noise due to scaling and truncation
effects. The equations for calculating the LSB weight of each QUANT parameter are provided at the
bottom of Table 86.
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