ADE7763ARSZ Analog Devices Inc, ADE7763ARSZ Datasheet - Page 30

• Manufacturer Part Number: ADE7763ARSZ
• Description: IC ENERGY METERING 1PHASE 20SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7763ARSZ

• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 3mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP (0.200", 5.30mm Width)
• Meter Type: Single Phase
• Ic Function: Single-Phase Active And Apparent Energy Metering IC
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADE7763ZEB - BOARD EVALUATION FOR ADE7763
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADE7763
LINE CYCLE ENERGY ACCUMULATION MODE
In line cycle energy accumulation mode, the energy accumu-
lation of the ADE7763 can be synchronized to the Channel 2
zero crossing so that active energy accumulates over an integral
number of half line cycles. The advantage of summing the active
energy over an integral number of line cycles is that the
sinusoidal component in the active energy is reduced to 0. This
eliminates ripple in the energy calculation. Energy is calculated
more accurately and in a shorter time because the integration
period is shortened. By using the line cycle energy accumulation
mode, the energy calibration can be greatly simplified, and the
time required to calibrate the meter can be significantly reduced.
The ADE7763 is placed in line cycle energy accumulation mode
by setting Bit 7 (CYCMODE) in the mode register. In line cycle
energy accumulation mode, the ADE7763 accumulates the
active power signal in the LAENERGY register (Address 0x04)
for an integral number of line cycles, as shown in Figure 61. The
number of half line cycles is specified in the LINECYC register
(Address 0x1C). The ADE7763 can accumulate active power for
up to 65,535 half line cycles. Because the active power is
integrated on an integral number of line cycles, the CYCEND
flag in the interrupt status register is set (Bit 2) at the end of a
line cycle energy accumulation cycle. If the CYCEND enable bit
in the interrupt enable register is enabled, the IRQ output also
will go active low. Therefore, the IRQ line can also be used to
signal the completion of the line cycle energy accumulation.
Another calibration cycle can start as long as the CYCMODE
bit in the mode register is set.
From Equations 13 and 18,
where:
n is an integer.
T is the line cycle period.
Since the sinusoidal component is integrated over an integral
number of line cycles, its value is always 0. Therefore,
E
E
E t
(
( )
=
t
)
∫
=
0
=
VIdt
nT
nT
∫
0
VInT
VI
+
dt
0
−
⎧
⎪
⎪ ⎪
⎨
⎪
⎪
⎪
⎩
1
+
VI
⎛
⎜
⎝
8
f
9 .
⎞
⎟
⎠
2
⎫
⎪
⎪ ⎪
⎬
⎪
⎪
⎪
⎭
×
nT
∫
0
cos(
2
π
t f
)
dt
(20)
(21)
(22)
Rev. B | Page 30 of 56
Note that in this mode, the 16-bit LINECYC 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 of 65,535 half line cycles. At 60 Hz line
frequency, this translates to a total duration of 65,535/
120 Hz = 546 seconds.
POSITIVE-ONLY ACCUMULATION MODE
In positive-only accumulation mode, the energy accumulation
is only done for positive power, ignoring any occurrence of
negative power above or below the no-load threshold, as shown
in Figure 62. The CF pulse also reflects this accumulation
method when in this mode. Positive-only accumulation mode is
activated by setting the MSB of the mode register (MODE[15]).
The default setting for this mode is off. Transitions in the
direction of power flow, going from negative to positive or
positive to negative, set the IRQ pin to active low if the PPOS
and PNEG bits are set in the interrupt enable register. The
corresponding PPOS and PNEG bits in the interrupt status
register show which transition has occurred—see the register
descriptions in
NO-LOAD THRESHOLD
The ADE7763 includes a no-load threshold feature on the active
energy that eliminates any creep effects in the meter. This is
accomplished because energy does not accumulate if the
multiplier output is below the no-load threshold. This threshold
is 0.001% of the full-scale output frequency of the multiplier.
Compare this value to the IEC1036 specification, which states
that the meter must start up with a load equal to or less than
0.4% I
output frequency of the multiplier.
ACTIVE ENERGY
Figure 62. Energy Accumulation in Positive-Only Accumulation Mode
ACTIVE POWER
THRESHOLD
THRESHOLD
b
. This standard translates to 0.0167% of the full-scale
NO-LOAD
NO-LOAD
IRQ
Table 9
PPOS
.
INTERRUPT STATUS REGISTERS
PNEG
PPOS
PNEG
PPOS
PNEG