ADE7758 Analog Devices, ADE7758 Datasheet - Page 51

• Manufacturer Part Number: ADE7758
• Description: Poly Phase Multifunction Energy Metering IC with Per Phase Information
• Manufacturer: Analog Devices

Step 1: If the values were changed after gain calibration, Step 1,
Step 3, and Step 4 from the gain calibration should be repeated
to configure the LCYCMODE, LINECYC, and MASK registers.
Step 2: Set the test system for I
Step 3: Reset the interrupt status register by reading RSTATUS
(0x1A).
Step 4: Read all xWATHR energy registers (0x01 to 0x03) after
the LENERGY interrupt and store the values.
Step 4a: Read the FREQ (0x10) register if the frequency is
unknown.
Step 5: Set the test system for I
Step 6: Repeat Step 3 and Step 4.
TEST
MIN
, V
, V
READ ALL XVARHR
NOM
STEP 7
XWATTOS FOR ALL
STEP 8
STEP 9
STEP 10
FOR I
REPEAT STEP 3 TO
NOM
AFTER LENERGY
XVARHR, XVAROS
SET UP SYSTEM
WRITE TO ALL
CALIBRATION
CALCULATE
STEP 8 FOR
REGISTERS
, and unity power factor.
, and unity power factor.
FOR STEP 10
XWATTOS
PHASES
TEST
INTERRUPT
PF = 0
Figure 83. Power Offset Calibration Using Line Accumulation
, V
NOM
YES
@
LINECYC AND MASK
STEP 1
STEP 2
STEP 3
STEP 4
REGISTERS AFTER
SET LCYCMODE,
SET UP SYSTEM
FOR I
FOR STEP 10, CALCULATE
XVAROS FOR ALL PHASES
FOR STEP 10, WRITE TO
ALL XVAROS REGISTERS
RESET STATUS
TESTED @ I
REGISTERS
INTERRUPT
REGISTER
READ ALL
XWATTHR
LENERGY
@ PF = 1
TEST
END
Rev. A | Page 51 of 68
, V
NOM
MIN
?
NO
STEP 5
FOR I
SET UP SYSTEM
Step 7: Calculate the value to be written to the xWATTOS
registers according to the following equations.
where Accumulation Time is defined in Equation 43 and
xWATTHRI
xWATTHRI
Step 8: Write to all xWATTOS registers (0x39 to 0x3B).
Step 9: Set the test system for I
(calibrate VAR gain).
Step 10: Repeat Steps 3, 4, and 5.
STEP 6
MIN
PF = 1
Offset
xWATTOS
, V
NOM
@
=
TEST
MIN
xWATTHR
is the value in the energy register at I
is the value in the energy register at I
[
11
FOR STEP 10,
PF = 0
0 :
]
=
I
AccumTime
MIN
×
TEST
I
Offset
I
TEST
MIN
, V
NOM
–
–
×
×
I
xWATTHR
, and zero power factor
TEST
4
CLKIN
×
2
ADE7758
I
TEST
29
MIN
TEST
×
.
, and
I
MIN
(53)
(52)