ADE9078ACPZ datasheet(51/108 Pages) AD

51 / 108 page

ADE9078

Data Sheet

Rev. 0 | Page 50 of 107

HPF

ZX DETECTION,

LINE PERIOD

CALCULATION

LPF1

PHASE

COMP

HPFDIS

ZX_SRC_SEL

AV_PCF

PHASE A

PHASE B

PHASE C

(VA + VB – VC)/2

HPF

ZX_SRC_SEL

BV_PCF

HPF

PHASE

COMP

ZX_SRC_SEL

CV_PCF

÷ 2

VCONSEL[2:0]

PHASE

COMP

Figure 71. Combined Zero-Crossing Detection

xx_PCF

LPF1

ZX_SRC_SEL

ZX DETECTION

ANGLE MEASUREMENT

ZX OUTPUT ON CF3/ZX PIN

fDSP

CLKIN/24UPDATE

÷32

ZX INDICATION IN STATUS1

ZERO-CROSSING TIMEOUT

PHASE SEQUENCE ERROR DETECTION

RESAMPLING, ENERGY ACCUMULATION

LINE PERIOD

Figure 72. Zero-Crossing Output Rates

Table 21. Zero Crossing Use in Other Functions

Functions Using

Zero Crossing

ZX Transitions

Used

Corresponding

STATUS1 Bits

Selecting Which Phase to

Use for Measurement

Effect if ZX Does Not Occur

ZX Indication in

STATUS1 Register

Negative to

positive and

positive to

negative

ZXIA, ZXIB, ZXIC,

ZXVA, ZXVB,

ZXVC, and

ZXCOMB

Not applicable

The ZXx bit is latched in STATUS1. If it is

cleared, it is not set again. A ZXx interrupt

does not occur.

Zero-Crossing

Timeout

Negative to

positive and

positive to

negative

ZXTOVA,

ZXTOVB, and

ZXTOVC

Not applicable

Zero-crossing timeout is indicated by the

ZXTOVx bits in the STATUS1 register and an

interrupt can be enabled to occur.

Phase Sequence

Error Detection

Depends on

VCONSEL setting

SEQERR

Not applicable

If one to two ZX events are missing, SEQERR

is generated. If all ZX events are missing, the

SEQERR bit is not set.

Energy

Accumulation

Negative to

positive and

positive to

negative

Not applicable

ZX_SEL selects the zero-

crossing output used for

line cycle energy

accumulation and ZX

output pin

Line cycle accumulation does not update.

Line Period

Measurement

Negative to

positive

Not applicable

One line period

measurement per phase

(APERIOD, BPERIOD,

CPERIOD, COMPERIOD)

Coerced to default value of 0x00500000 if

SELFREQ = 0 for a 50 Hz network or

0x0042AAAB if SELFREQ = 1 for a 60 Hz

network.

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