ADE7763ARSZRL Analog Devices Inc, ADE7763ARSZRL Datasheet - Page 41
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ADE7763ARSZRL
Manufacturer Part Number
ADE7763ARSZRL
Description
IC ENERGY METERING 1PHASE 20SSOP
Manufacturer
Analog Devices Inc
Datasheet
1.ADE7763ARSZRL.pdf
(56 pages)
Specifications of ADE7763ARSZRL
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
Compliant
Other names
ADE7763ARSZRL
ADE7763ARSZRLTR
ADE7763ARSZRLTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ADE7763ARSZRL
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Calibrating Phase with an Accurate Source Example
With an accurate source, line cycle accumulation is a good
method of calibrating phase error. The value of LAENERGY
must be obtained at two power factors, PF = 1 and PF = 0.5
inductive.
For this example:
Meter Constant:
Line Voltage:
Line Frequency:
CF Numerator:
CF Denominator:
Base Current:
Half Line Cycles Used at Base Current:
PERIOD Register:
Expected Line Accumulation at Unity Power Factor (from Watt
Gain section):
Active Energy Reading at PF = 0.5 inductive:
Figure 76. Calibrating Phase with an Accurate Source
SET HALF LINE CYCLES FOR ACCUMULATION
CALCULATE PHCAL. SEE EQUATION 55.
ENABLE LINE CYCLE ACCUMULATION
ACCUMULATION ADDR. 0x09 = 0x0080
READ LINE ACCUMULATION ENERGY
WRITE PHCAL VALUE TO THE PHCAL
SET I
IN LINECYC REGISTER ADDR. 0x1C
RESET THE INTERRUPT STATUS
RESET THE INTERRUPT STATUS
INTERRUPT ADDR. 0x0A = 0x04
READ REGISTER ADDR. 0x0C
READ REGISTER ADDR. 0x0C
SET MODE FOR LINE CYCLE
TEST
REGISTER: ADDR. 0x10
= I
INTERRUPT?
INTERRUPT?
b
ADDR. 0x04
YES
YES
, V
TEST
MeterConstant (imp/Wh) = 3.2
V
f
CFNUM = 0
CFDEN = 489
I
LINECYC
PERIOD = 8959
LAENERGY
LAENERGY
L
b
nominal
= 50 Hz
= 10 A
= V
NOM
= 220 V
, PF = 0.5
IB
NO
NO
= 2000
IB(expected)
IB, PF = 0.5
= 9613
= 19186
Rev. B | Page 41 of 56
The error using Equation 52 is
Using Equation 55, PHCAL is 11.
Note that PHCAL is a signed, twos complement register.
The phase lead is corrected by 0.08 degrees when the PHCAL
register is set to 11:
VRMS and IRMS Calibration
VRMS and IRMS are calculated by squaring the input in a
digital multiplier.
The square of the rms value is extracted from v
filter. The square root of the output of this low-pass filter gives
the rms value. An offset correction is provided to cancel noise
and offset contributions from the input.
There is ripple noise from the 2ω term because the low-pass
filter does not completely attenuate the signal. This noise can be
minimized by synchronizing the rms register readings with the
zero crossing of the voltage signal. The IRQ output can be
configured to indicate the zero crossing of the voltage signal.
This flowchart demonstrates how VRMS and IRMS readings
are synchronized to the zero crossings of the voltage input.
Error =
Phase Error (°) = −Arcsin
PHCAL = INT
Phase Correction (°) = −
Phase Correction (°) = −
v
2
) (
t
=
9613
2
V
19186
sin(
−
⎛
⎜
⎝
19186
−
ω
. 0
t
2
)
07
×
2
°
×
2
(
(
=
11
PHCAL
V
8959
360
⎛
⎜ ⎜
⎝
. 0
. 0
sin(
−
0021
0021
°
0x0D
3
⎞
⎟
⎠
ω
+
t
−
)
⎞
⎟ ⎟
⎠
0x0D
)
=
0x0D
=
×
V
−
8960
360
2
. 0
=
−
)
07
×
°
2
−
V
( t ) by a low-pass
°
2
=
PERIOD
2
ADE7763
+
. 0
×
360
13
08
cos(
°
°
=
2
11
ω
t
(59)
)