ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 45

• 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

Voltage rms compensation is done after the square root.
where:
VRMS0 is the rms measurement without offset correction.
VRMS is linear from full-scale to full-scale/20.
To calibrate the offset, two VRMS measurements are required,
for example, at V
full-scale analog input range so the smallest linear VRMS
reading is at V
where VRMS
correction for input V and V , respectively.
If th
not enou
used to correct the VRMS offset.
Current rms compensation is performed before th
where IRMS0 is the rms measurement without offset correction
The current rms calculation is linear from full-scale to full
scale/100.
To c
for example, at I
analog input range so the smallest linear IRMS reading is at
I
where IRMS and IRMS
correction for input I
MAX
alibrate this o
/50.
e range of the 12-bit, twos com
VRMS = VRMS0 + VRMSOS
VRMSOS =
IRMS
IRMSOS =
gh, the voltage channel offset register, CH2OS, can be
2
= IRMS0
1
1
nominal
and VRMS
b
32768
nominal
and I
V
ffset, two IRMS measurem
1
1
/10.
×
2
1
VRMS
1
+ 32768 × IRMSOS
and V
MAX
and I , respectively.
×
2
are rms register values without offset
I
2
/50. I
1
V
are rms register values without o
2
2
2
2
nominal
×
−
2
−
IRMS
V
MAX
V
2
1
/10. V
×
is set at half of the full-scale
I
plement VRMSOS regist
VRMS
2
2
2
2
−
−
nominal
I
I
2
1
1
2
2
×
ents are required,
is set at half of the
IRMS
e square root:
1
2
-
ffset
er is
(64)
(65)
(66
(67)
Rev. A | Page 45 of 60
)
.
Apparent Energy
Apparent energy gain calibration is provided for both meter-to-
meter gain adjustment and for setting the VAh/LSB constant.
VADIV is similar to the CFDEN for the watt hour calibration. It
should be the same across all meters and determines the VAh/LSB
constant. VAGAIN is used to calibrate individual meters.
Apparent energy gain calibration should be performed before
rms offset correction to make most efficient use of the current
test points. Apparent energy gain and watt gain compensation
require testing at I
a lower test current. Apparent energy gain calibration can be
done at the same time as the watt-hour gain calibration using
line cycle accumulation. In this case, LAENERGY and
LVAENERGY, the line cycle accumulation apparent energy
register, are both read following the line cycle accumulation
interrupt. Figure 87 shows a flowchart for calibrating active and
apparent energy simultaneously.
The accumulation time is determined from Equation 37 and the
line period can be determined from the PERIOD register accord-
ing to Equation 38. The VAh represented by the VAENERGY
register is
The VAh/LSB constant can be verified using this equation:
VAENERGY =
VAGAIN = INT
LVAENERGY
INT
VAh = VAENERGY × VAh/LSB constant
VAENERGY
VAh
⎛
⎜
⎜
⎜
⎜
⎝
LSB
VAh
LSB
constant
constant
V
initial
nominal
b
IB(expected)
while rms and watt offset correction require
⎛
⎜
⎜
⎝
×
⎛
⎜
⎜
⎝
=
VADIV
LVAENERGY
LVAENERGY
×
×
VA
I
3600
=
1
B
×
Accumulati
s/h
×
⎛
⎜
⎝
LVAENERGY
1
×
+
Accumulati
IB
IB
VAGAIN
(
(
expected
nominal
2
on
12
time
)
)
⎞
⎟
⎠
on
(s)
−
1
time
3600
⎞
⎟
⎟
⎠
ADE7753
×
2
(s)
12
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎟
⎟
⎠
(69)
(70)
(68)
(71)
(72)