ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 28

• Manufacturer Part Number: ADE7753ARSZ
• Description: IC ENERGY METERING 1PHASE 20SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7753ARSZ

• 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 Multifunction 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-ADE7753ZEB - BOARD EVALUATION AD7753
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADE7753
Figure 63 shows the signal processing chain for the active power
calculation in the ADE7753. As explained, the active power is
calculated by low-pass filtering the instantaneous power signal.
Note that when reading the waveform samples from the output
of LPF2, the gain of the active energy can be adjusted by using
the multiplier and watt gain register (WGAIN[11:0]). The gain
is adjusted by writing a twos complement 12-bit word to the
watt gain register. Equation 11 shows how the gain adjustment
is related to the contents of the watt gain register:
For example, when 0x7FF is written to the watt gain register, the
power output is scaled up by 50%. 0x7FF = 2047d, 2047/2
0.5. Similarly, 0x800 = –2048d (signed twos complement) and
power output is scaled by –50%. Each LSB scales the power
output by 0.0244%. Figure 64 shows the maximum code (in
hex) output range for the active power signal (LPF2). Note that
the output range changes depending on the contents of the watt
gain register. The minimum output range is given when the watt
gain register contents are equal to 0x800, and the maximum
range is given by writing 0x7FF to the watt gain register. This
can be used to calibrate the active power (or energy) calculation
in the ADE7753.
Output
WGAIN
=
CURRENT
CHANNEL
CHANNEL
VOLTAGE
⎛
⎜ ⎜
⎝
Active
Power
T
×
⎧
⎨
⎩
1
ACTIVE POWER
+
LPF2
CLKIN
WGAIN
SIGNAL
4
TIME (nT)
2
12
Figure 63. ADE7753 Active Energy Calculation
APOS[15:0]
+
⎫
⎬
⎭
⎞
⎟ ⎟
⎠
+
WAVEFORM
REGISTER
12
VALUES
WGAIN[11:0]
=
Rev. A | Page 28 of 60
(11)
WDIV[7:0]
%
ENERGY CALCULATION
As stated earlier, power is defined as the rate of energy flow.
This relationship can be expressed mathematically in Equation 12.
where:
P is power.
E is energy.
Conversely, energy is given as the integral of power.
48
23
P =
E
AENERGY [23:0]
= Pdt
∫
dE
0xECCCD
dt
0xF999A
0xCCCD
0xF3333
0x13333
0x00000
OUTPUTS FROM THE LPF2 ARE
ACCUMULATED (INTEGRATED) IN
THE INTERNAL ACTIVE ENERGY REGISTER
Figure 64. Active Power Calculation Output Range
0x6666
0
0x000
CALIBRATION RANGE
UPPER 24 BITS ARE
ACCESSIBLE THROUGH
AENERGY[23:0] REGISTER
ACTIVE POWER
{WGAIN[11:0]}
0x7FF
0x800
02875-0-063
0
POSITIVE
POWER
NEGATIVE
POWER
02875-0-062
(12)
(13)