ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 44

• 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
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 = .5 inductive:
Figure 85. Calibrating Phase with an Accurate Source
SET HALF LINE CYCLES FOR ACCUMULATION
CALCULATE PHCAL. SEE EQUATION 59.
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
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
MeterConstant(imp/Wh) = 3.2
V
f
CFNUM = 0
CFDEN = 489
I
LINECYC
PERIOD = 8959
LAENERGY
l
b
TEST
nominal
= 50 Hz
= 10 A
= V
LAENERGY
= 220 V
NOM
IB
, PF = 0.5
= 2000
NO
NO
IB, PF = .5
02875-A-011
IB(expected)
= 9613
= 19186
Rev. A | Page 44 of 60
The error using Equation 56 is
Usin
Note
The phase lead is corrected by 0.08° when the PHCAL register
is set to 11:
VRMS and IRMS Calibration
VRM
digital multiplier.
The square of the rms value is extracted from v
filter. The square root of the output of this low-pass filter
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 si
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 ar
synchronized to the zero crossings of the voltage input.
Figure 86. Synchronizing VRMS and IRMS Readings with Zero Crossings
Error =
Phase Er
g Equation 59, PHCAL is c
PHCAL = INT
Phase Correction (°) =
Phase Correction (°) =
v
that PHCAL is
S and IRMS are calcula
2
) (
t
=
9613 −
ror (°) = −Arcsin
2
V
19186
sin(
SET INTERRUPT ENABLE FOR ZERO
RESET THE INTERRUPT STATUS
RESET THE INTERRUPT STATUS
CROSSING ADDR. 0x0A = 0x0010
⎛
⎜
⎝
19186
READ REGISTER ADDR. 0x0C
READ REGISTER ADDR. 0x0C
ω
a signed twos complement register.
−
t
. 0
2
READ VRMS OR IRMS
)
×
ADDR. 0x17; 0x16
07
INTERRUPT?
2 =
YES
°
2
−
−
×
ted by squaring the input in a
V
(
(
8959
360
. 0
11
PHCAL
⎛
⎜
⎜
⎝
sin(
alculated to be 11
0021
. 0
−
°
0021
0x0D
ω
⎞
⎟
⎠
3
t
+
)
=
0x0D
NO
−
⎞
⎟
⎟
⎠
)
V
0x0D
=
×
gnal. This noise can be
2
−
8960
360
−
. 0
=
V
02875-A-003
07
)
−
°
×
2
2
2
°
×
(t) by a low-pass
=
PERIOD
+
.
cos(
. 0
13
360
08
=
2
°
°
ω
11
t
)
gives
(63)
e