ADE9178 datasheet(44/122 Pages) AD

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Data Sheet

ADE9178

THEORY OF OPERATION

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Rev. A | 44 of 122

Table 22. Zero-Crossing Use in Other Functions

Function Using Zero Crossing

ZX Transition Used

Corresponding STATUSx

Selecting Which Phase to Use

for Measurement

Effect if ZX Does Not Occur

ZX Indication in STATUS0 Register1

Negative to positive

and positive to

negative

ZXAI, ZXBI, ZXCI, ZXAV,

ZXBV, ZXCV, ZXAUX0,

ZXAUX1, ZXAUX2,

ZXAUX3, ZXAUX4,

ZXAUX5, and ZXCOMB of

STATUS0 and STATUS1

registers

N/A2

ZXx bit is latched in STATUS1. If

cleared, it is not set again. ZXx interrupt

does not occur.

Zero-Crossing Timeout

Negative to positive

and positive to

negative

ZXTOAV, ZXTOBV, and

ZXTOCV of STATUS0 and

STATUS1 registers

N/A2

Zero-crossing timeout is indicated by the

ZXTOAV, ZXTOBV, or ZXTOCV bit in

the STATUS0 register and an interrupt

can be enabled to occur.

Phase-Sequence Error Detection

Negative to positive

only

SEQERR of STATUS0 and

STATUS1 registers

N/A2

If one to two ZX events are missing,

SEQERR is generated. If all ZX are

missing then SEQERR bit is not set.

Energy Accumulation

Negative to positive

and positive to

negative

N/A2

ZX_LP_SEL:ZX_SEL[1:0] selects

the zero-crossing output used for

line-cycle energy accumulation and

ZX output pin.

Line-cycle accumulation does not

update. Note, it is not recommended to

use line-cycle accumulation mode (for

more details, see Table 30).

Line Period Measurement

Negative to positive

only

N/A2

Coerced to default value: 0x0050_0000

if ACCMODE.SELFREQ = 0, for

a 50 Hz network, 0x0042_AAAA if

ACCMODE.SELFREQ = 1, for a 60 Hz

network.

RMSONE, DIPONE, SWELLONE

Negative to positive

only

STATUS2 register

ZX_LP_SEL:LP_SEL[3:2] selects

the phase voltage line period used

as the basis for these calculations.

If the selected line period is invalid

because zero crossings are not

detected or the calculation results

in something outside a 40 Hz to

70 Hz range, the line period used

for the calculation is coerced to

the default line period: 0x0050_0000

if ACCMODE:SELFREQ = 0, for

a 50 Hz network, 0x0042_AAAA if

ACCMODE:SELFREQ = 1, for a 60

Hz network. This line period is used

to calculate RMSONE and associated

events.

RMSHALF, DIPHALF, SWELLHALF

Negative to positive

and positive to

negative

STATUS3 register

N/A2

If bits are set to 1 in the

RMSHALF_CONFIG register then the

corresponding RMSHALF register value

is calculated based on the user-

configured half line-cycle period register

(USER_PERIOD_HALF). Otherwise,

if zero crossing is not detected,

the corresponding RMSHALF register

value is not updated. DIPHALF and

SWELLHALF is not detected in such

cases.

Angle Measurements

Negative to positive

only

N/A2

Does not update, keeps last value.

1 The ZX output from ADE9178 has very high jitter, hence it is not intended for external use.

2 N/A means not applicable.

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