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71M6533- DB Demo Board User’s Manual
are 64 bits long and are accessed with )n$$ (read) and )n=hh=ll (write) in the case of accumulation variables.
Default values are the values assigned by the Demo Code on start-up.
All MPU Input Parameters are loaded by the MPU at startup and should not need adjustment during meter
calibration.
MPU Input Parameters for Metering
XRAM
Word
Address
Default
Value
Name
Description
For each element, if WSUM_X or VARSUM_X of that element ex-
ceeds WCREEP_THR , the sample values for that element are not
zeroed. Otherwise, the accumulators for Wh, VARh, and VAh are
not updated and the instantaneous value of IRMS for that
element is zeroed.
0x00
433199
ITHRSHLDA
LSB ? I0SQSUM ? 2 16
The default value is equivalent to 0.08A. Setting ITHRSHLDA to
zero disables creep control.
Bit 0:
Sets VA calculation mode.
0x01
0
CONFIG
0: V RMS *A RMS
1:
W 2 ? VAR 2
Bit 1: Clears accumulators for Wh, VARh, and VAh. This bit
need not be reset.
When the voltage exceeds this value, bit 5 in the MPU status
word is set, and the MPU might choose to log a warning. Event
0x02
764569660
PK_VTHR
logs are not implemented in Demo Code.
LSB ? V0SQSUM ? 2 16
The default value is equivalent to 20% above 240Vrms.
When the current exceeds this value, bit 6 in the MPU status
word is set, and the MPU might choose to log a warning. Event
logs are not implemented in Demo Code.
0x03
275652520
PK_ITHR
LSB ? I0SQSUM ? 2 16
The default value is equivalent to 20% above 30A RMS .
RTC adjust, squared by temperature, 1ppb*ΔT , in 0.1?C.
0x04
0x05
0x06
0
0
0
Y_CAL_DEG0
Y_CAL_DEG1
Y_CAL_DEG2
RTC adjust, 100ppb. Read only at reset in demo code.
RTC adjust, linear by temperature, 1 0ppb*ΔT, in 0.1?C. Provided
for optional code.
2
Provided for optional code.
This address contains a number that points to the selected pulse
0x07
0
PULSEW_SRC
source for the Wh output. Selectable pulse sources are listed in
This address contains a number that points to the selected pulse
0x08
4
PULSER_SRC
source for the VARh output. Selectable pulse sources are listed
The nominal external RMS voltage that corresponds to 250mV
0x09
6000
VMAX
peak at the ADC input. The meter uses this value to convert
internal quantities to external. LSB=0.1V
The nominal external RMS current that corresponds to 250mV
0x0A
2080
IMAX
peak at the ADC input for channel A. The meter uses this value
to convert internal quantities to external. LSB=0.1A
Page: 28 of 75
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