MAXQ3180-RAN+ datasheet(89/101 Pages) MAXIM

89 / 101 page

Low-Power, Multifunction, Polyphase AFE

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Fundamental Energy

Fundamental Energy Overflow Flags, Phase X = A/B/C (X.EFOVER)

(A: 0x147, B: 0x233, C: 0x31F)

These bits indicate an overflow condition has occurred on a fundamental frequency energy accumulator. An over-

flow condition is not an error condition. Rather, it simply indicates that the value in the energy accumulator could be

smaller than the previous reading due to the overflow in the counter. To obtain the actual energy usage since the

previous reading, 0x100000000 must be added to the difference. These bits, once set, can be cleared only by the

host.

Energy, Fundamental, Real Positive, Phase X = A/B/C (X.EAFPOS)

(A: 0x1FC, B: 0x2E8, C: 0x3D4)

On every DSP cycle, the contents of the X.ACTF register are tested, and if positive, are added to this register. When

this register overflows, the APFOV bit in the X.EFOVER register is set.

BIT

NAME

FUNCTION

7:5

—

Reserved.

SFOV

When set, indicates an overflow condition on the apparent fundamental-mode energy accumulator.

RNFOV

When set, indicates an overflow condition on the reactive negative fundamental-mode energy accumulator.

RPFOV

When set, indicates an overflow condition on the reactive positive fundamental-mode energy accumulator.

ANFOV

When set, indicates an overflow condition on the real negative fundamental-mode energy accumulator.

APFOV

When set, indicates an overflow condition on the real positive fundamental-mode energy accumulator.

Bit:

Name:

—

SFOV

RNFOV

RPFOV

ANFOV

APFOV

Reset:

Bit:

Name:

Real Energy Byte 3

Bit:

Name:

Real Energy Byte 2

Bit:

Name:

Real Energy Byte 1

Bit:

Name:

Real Energy Byte 0

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