Maxim Integrated 71M6533-DB - Manual (Page 28)

71M6533- DB Demo Board User’s Manual
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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
0x00 433199 ITHRSHLDA
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.
16 2 I0SQSUM
 
LSB
The default value is equivalent to 0.08A. Setting ITHRSHLDA to
zero disables creep control.
0x01 0 CONFIG
Bit 0: Sets VA calculation mode.
0: V
RMS
*A
RMS
1:
2 2 VAR W

Bit 1: Clears accumulators for Wh, VARh, and VAh. This bit
need not be reset.
0x02 764569660 PK_VTHR
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
logs are not implemented in Demo Code.
16 2 V0SQSUM
 
LSB
The default value is equivalent to 20% above 240Vrms.
0x03 275652520 PK_ITHR
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.
16 2 I0SQSUM
 
LSB
The default value is equivalent to 20% above 30A
RMS
.
0x04 0 Y_CAL_DEG0 RTC adjust, 100ppb. Read only at reset in demo code.
0x05 0 Y_CAL_DEG1
RTC adjust, linear by temperature, 1 0ppb*ΔT, in 0.1˚C. Provided
for optional code.
0x06 0 Y_CAL_DEG2
RTC adjust, squared by temperature, 1ppb*ΔT 2 , in 0.1˚C.
Provided for optional code.
0x07 0 PULSEW_SRC
This address contains a number that points to the selected pulse
source for the Wh output. Selectable pulse sources are listed in
Table 1-5.
0x08 4 PULSER_SRC
This address contains a number that points to the selected pulse
source for the VARh output. Selectable pulse sources are listed
in Table 1-5.
0x09 6000 VMAX
The nominal external RMS voltage that corresponds to 250mV
peak at the ADC input. The meter uses this value to convert
internal quantities to external. LSB=0.1V
0x0A 2080 IMAX
The nominal external RMS current that corresponds to 250mV
peak at the ADC input for channel A. The meter uses this value
to convert internal quantities to external. LSB=0.1A