MAXQ3180-RAN+ datasheet(51/101 Pages) MAXIM

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Low-Power, Multifunction, Polyphase AFE

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Energy Units Conversion Coefficient (ENR_CC) (0x01A) (continued)

DESCRIPTION

RAW

VIRTUAL

Reactive energy, phase C, positive direction, fundamental only

C.ERFPOS

Reactive energy, phase C, reverse direction, fundamental only

C.ERFNEG

ENRQF.C*

Reactive energy, total, fundamental only

—

ENRQF.T

Apparent energy, phase A, fundamental only

A.ESF

ENRSF.A

Apparent energy, phase B, fundamental only

B.ESF

ENRSF.B

Apparent energy, phase C, fundamental only

C.ESF

ENRSF.C

Apparent energy, total, fundamental only

—

ENRSF.T

To avoid significant conversion loss, ENR_LSB should be chosen such that ENR_CC is > 1000. Calculate the value

of ENR_CC according to the following formula:

Virtual Registers

The virtual registers are calculated values derived from one or more real registers. They are calculated at the time

they are requested, and thus could involve additional time to return a value. Most virtual registers are 8 bytes in

length and are delivered least significant byte first.

Power

Real Power, Phase X = A/B/C/T (PWRP.X) (A: 0x801, B: 0x802, C: 0x804, T: 0x807)

This signed register contains the real instantaneous power delivered into phase A/B/C or total. Power is calculated

from the instantaneous energy measurement according to the following equation:

The register is 8 bytes long, but the most significant 2 bytes are not used. See the PWR_CC register description for

more details.

Note that the sign bit is bit 47 for all 8-byte signed virtual registers.

PWRP X

XACT

PWR CC

×× 216

ENR CC

ENR LSB

××

216

These registers represent the algebraic sum of the positive and reverse energy in the two “raw” registers noted. Thus, the energy

accumulated in these virtual registers represents the net energy.

Byte 7 (MSByte unused)

Byte 6 (unused)

Byte 5

Byte 4

Byte 3

Byte 2

Byte 1

Byte 0 (LSByte)

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