ADE7763ARS Analog Devices Inc, ADE7763ARS Datasheet - Page 42

• Manufacturer Part Number: ADE7763ARS
• Description: IC ENERGY METER 1PHASE 20SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7763ARS

• 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
• For Use With: EVAL-ADE7763ZEB - BOARD EVALUATION FOR ADE7763
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ADE7763
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 that the smallest linear VRMS
reading is at V
where VRMS
correction for input V
If the range of the 12-bit, twos complement VRMSOS register is
not enough, use the voltage channel offset register, CH2OS, to
correct the VRMS offset.
Current rms compensation is performed before the square root:
where IRMS0 is the rms measurement witho
The current rms c lc
scale/100.
To calibrate this offset, two IRMS measuremen
for example, at I
analog input range so that the smallest linear IRM
I
MAX
Figure 77. Synchronizing VRMS and IRMS Readings with Zero Crossings
/50.
VRMS = VRMS0 + VRMSOS
VRMSOS =
IRMS
2
= IRMS0
1
SET INTERRUPT ENABLE FOR ZERO
nominal
and VRMS
RESET THE INTERRUPT STATUS
RESET THE INTERRUPT STATUS
CROSSING ADDR. 0x0A = 0x0010
b
nominal
READ REGISTER ADDR. 0x0C
READ REGISTER ADDR. 0x0C
V
and I
a ula
1
/10.
READ VRMS OR IRMS
×
2
ADDR. 0x17; 0x16
+ 32768 × IRMSOS
1
VRMS
and V
MAX
and V
INTERRUPT?
tio is linear fro
YES
2
/50. I
n
are rms register values without offset
V
nominal
2
2
2
, respectively.
−
−
MAX
V
V
/10. V
2
1
is set
×
NO
VRMS
nominal
m full scale to full
at alf of the full-scale
h
1
ut offset correction.
is set at half of the
ts are required,
S reading is at
(60)
(61)
(62)
Rev. A | Page 42 of 56
whe
correction for input I
App
Apparent energy gain calibration is provided for both meter-to-
meter gain adjustment and for settin
VADIV is similar to the CFDEN for the watt-hour calibra
should be the same across all meters and determines the VAh/LSB
constant. VAGAIN is
App
rms
test points. Apparent energy gain and watt gain compensation
requ
a lower test current. Apparent energy gain calibration can be
done simultaneously with the wa
using line cycle accumulation. In this case, LAENERGY and
LVAENERGY, the
registers, are both read following the line cycle accumulation
interrupt. Figure 78 shows a flowchart for calibrating active and
appa
The accumulation time is determined from Equation 33, and
the line period can be determined from the period register
according to Equation 34. The VAh represented by the
VAENERGY register is
The VAh/LSB constant can be verified using this equation:
re IRMS
arent energy gain calibrat
offset correction to make
arent Energy
ire testing at I
IRMSOS =
VAENERGY =
rent energy simultaneously.
VAGAIN = INT
LVAENERGY
INT
VAh = VAENERGY × VAh/LSB constant
VAENERGY
VAh
⎛
⎜
⎜
⎜
⎜
⎝
LSB
VAh
LSB
1
and IRMS
constant
constant
32768
V
initial
IB(expected)
b
line cycle accumulation apparent energy
nominal
, while rm
1
⎛
⎜
⎜
⎝
1
used to calibrate individual meters.
⎛
⎜
⎜
⎝
and I
×
×
2
LVAENERGY
LVAENERGY
=
VADIV
×
are rms regis r values without offset
×
I
VA
=
I
1
3600
2
2
1
B
, respectively.
s and watt offset correction equire
×
the most efficient use of the c rent
×
ion should be performed bef
IRMS
Accumulati
s/h
×
tt-hour gain calibration
⎛ +
⎜
⎝
LVAENERGY
1
×
I
g the VAh/LSB constant.
2
2
IB
te
IB
Accumulati
2
2
(
(
VAGAIN
expected
nominal
−
−
I
I
2
2
1
on
12
2
2
)
)
×
time
−
IRMS
1
on
⎞
⎟
⎠
⎞
⎟
⎟
⎠
(
×
s
time
)
2
1
3600
12
2
⎞
⎟
⎟
⎠
(
r
tion. It
s
ur
ore
)
⎞
⎟
⎟
⎟
⎟
⎠
(63)
(64)
(65
(6
(67)
(68)
6)
)