ADE7166 datasheet(58/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 58 of 148

0xDB) is set, the 8052 core has a pending ADE interrupt. The

ADE interrupt stays active until the CYCEND status bit is

cleared—see Energy measurement interrupts section. Another

calibration cycle will start as soon as the CYCEND flag is set. If

the LWATTHR register is not read before a new CYCEND flag

is set, the LWATTHR register will be overwritten by a new

value.

When a new half line cycles is written in LINECYC register, the

LWATTHR register is reset and a new accumulation start at the

next zero-crossing. The number of half line cycles is then

counted until LINCYC is reached . This implementation

provides a valid measurement at the first CYCEND interrupt

after writing to the LINCYC register – see Figure 43. The line

active energy accumulation uses the same signal path as the

active energy accumulation. The LSB size of these two registers

is equivalent.

LINECYC

VALUE

CYCEND IRQ

LWATTHR REGISTER

Figure 43. Energy Accumulation when LINECYC changed

From Equations 13 and 18,

E(t) =

∫

⎪

⎭

⎪⎪

⎪

⎬

⎫

⎪

⎩

⎪⎪

⎪

⎨

⎧

⎟

⎠

⎞

⎜

⎝

⎛

−

cos

(2πft)dt

(20)

where:

n is an integer.

T is the line cycle period.

Since the sinusoidal component is integrated over an integer

number of line cycles, its value is always 0. Therefore,

E =

∫

VIdt

+ 0

(21)

E(t) = VInT

(22)

WDIV[7:0]

WATTOS[15:0]

WGAIN[11:0]

LPF1

LWATTHR [23:0]

ACCUMULATE ACTIVE

ENERGY IN INTERNAL

THE LWATTHR REGISTER

AT THE END OF LINCYC

HALF LINE CYCLES

OUTPUT

FROM

LPF2

FROM VOLTAGE

CHANNEL

ADC

LINCYC [15:0]

ZERO CROSS

DETECTION

CALIBRATION

CONTROL

DIGITAL TO FREQUENCY

CONVERTER

Figure 44. Line Cycle Active Energy Accumulation

Note that in this mode, the 16-bit LINCYC register can hold a

maximum value of 65,535. In other words, the line energy

accumulation mode can be used to accumulate active energy for

a maximum duration over 65,535 half line cycles. At 60 Hz line

frequency, it translates to a total duration of 65,535/120 Hz =

546 seconds.

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