ADE7753ARS Analog Devices Inc, ADE7753ARS Datasheet - Page 40

• Manufacturer Part Number: ADE7753ARS
• Description: IC ENERGY METERING DETEC 20-SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7753ARS

• Rohs Status: RoHS non-compliant
• 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-ADE7753ZEB - BOARD EVALUATION AD7753

ADE7753
Equation 47 describes the relationship between the expected
LAENERGY value and the LAENERGY measured in the test
condition:
WGAIN = INT
Figure 81. Calibrating Watt Gain Using an Accurate Source
SET HALF LINECYCLES FOR ACCUMULATION
WRITE CFDEN VALUE TO CFDEN REGISTER
CALCULATE CFDEN VALUE FOR DESIGN
CALCULATE WGAIN. SEE EQUATION 47.
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
READ LINE ACCUMULATION ENERGY
WRITE WGAIN VALUE TO THE WGAIN
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
LAENERGY
REGISTER: ADDR. 0x12
LAENERGY
ADDR. 0x15 = CFDEN
= I
INTERRUPT?
INTERRUPT?
ADDR. 0x04
YES
YES
b
, V
TEST
= V
IB
IB
(
(
NOM
expected
nominal
, PF = 1
NO
NO
)
)
02875-A-007
−
1
⎞
⎟
⎟
⎠
×
2
12
⎞
⎟
⎟
⎠
(47)
Rev. A | Page 40 of 60
The nominal LAENERGY reading, LAENERGY
LAENERGY reading with the test current applied. The expected
LAENERGY reading is calculated from the following equation:
where CF
tion time is calculated from Equation 37, and the line period is
determined from the PERIOD register according to Equation 38.
For this example:
Meter Constant:
Test Current:
Line Voltage:
Line Frequency:
Half Line Cycles:
CF Numerator:
CF Denominator:
Energy Reading at Base Current:
Period Register Reading:
Clock Frequency:
CF
LAENERGY
WGAIN is calculated to be 480 using Equation 47.
Note that WGAIN is a signed twos complement register.
expected
LAENERGY
INT
CF
LAENERGY
INT
LAENERGY
INT
WGAIN = INT
INT
. 3
200
IB(expected)
is calculated to be 1.9556 Hz according to Equation 34.
⎛
⎜
⎜
⎜
⎜
⎝
⎛
⎜
⎜
⎜
⎜
⎝
⎛
⎜
⎜
⎜
⎜
⎝
(
IB(expected)
19186
. 1
CF
CF
imp/Wh
9556
expected
IB
IB
(Hz) =
3600
(
(
.
expected
expected
) 4
(Hz) is calculated from Equation 34, accumula-
IB(expected)
IB(expected)
IB(expected)
×
is calculated to be 19186 using Equation 48.
CFNUM
=
CFDEN
×
2000
⎛
⎜ ⎜
⎝
19186
s/h
220
⎛
⎜
⎝
19186
17174
)
)
×
×
2 /
=
V
=
=
LINECYC
Accumulati
CFNUM
×
×
CFDEN
+
+
10
8959
MeterConstant(imp/Wh) = 3.2
I
V
f
LINECYC
CFNUM = 0
CFDEN = 489
LAENERGY
PERIOD = 8959
CLKIN = 3.579545 MHz
489
−
1
l
b
1
nominal
= 50 Hz
= 10 A
1
×
1
A
⎞
⎟
⎠
+
WDIV
×
×
×
1
8
2
+
IB
= 220 V
(cos(
+
12
/(
on
1
1
. 3
2 /
⎞
⎟ ⎟
⎠
IB
×
Time
579545
=
WDIV
×
= 2000
ϕ
IB (nominal)
480
)
PERIOD
= 1.9556 Hz
(s)
×
⎞
⎟
⎟
⎟
⎟
⎠
IB(nominal)
10
= 17174
6
×
(48)
)
/ 8
⎞
⎟
⎟
⎟
⎟
⎠
1
CLKIN
, is the
=
⎞
⎟
⎟
⎟
⎟
⎠