Maxim-integrated 71M6533-DB Instrukcja Użytkownika Pobierz pdf (Strona 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.

2I0SQSUM LSB

The default value is equivalent to 0.08A. Setting ITHRSHLDA to

zero disables creep control.

0x01

CONFIG

Bit 0: Sets VA calculation mode.

0: V

RMS

VARW 

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.

2V0SQSUM 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.

2I0SQSUM LSB

The default value is equivalent to 20% above 30A

RMS

0x04

Y_CAL_DEG0

RTC adjust, 100ppb. Read only at reset in demo code.

0x05

Y_CAL_DEG1

RTC adjust, linear by temperature, 10ppb*ΔT, in 0.1˚C. Provided

for optional code.

0x06

Y_CAL_DEG2

RTC adjust, squared by temperature, 1ppb*ΔT

, in 0.1˚C.

Provided for optional code.

0x07

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

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

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