ADE7758ARWRL datasheet(51/68 Pages) AD

51 / 68 page

ADE7758

Rev. A | Page 51 of 68

STEP 1

SET LCYCMODE,

LINECYC AND MASK

REGISTERS

STEP 2

SET UP SYSTEM

FOR ITEST, VNOM

@ PF = 1

STEP 3

RESET STATUS

STEP 4

READ ALL

XWATTHR

REGISTERS AFTER

LENERGY

INTERRUPT

STEP 5

SET UP SYSTEM

FOR IMIN, VNOM @

PF = 1

END

FOR STEP 10

READ ALL XVARHR

AFTER LENERGY

INTERRUPT

FOR STEP 10, CALCULATE

XVAROS FOR ALL PHASES

YES

TESTED @ IMIN?

STEP 7

CALCULATE

XWATTOS FOR ALL

PHASES

FOR STEP 10, WRITE TO

ALL XVAROS REGISTERS

FOR STEP 10,

PF = 0

STEP 8

WRITE TO ALL

XWATTOS

REGISTERS

STEP 9

SET UP SYSTEM

FOR ITEST, VNOM @

PF = 0

STEP 10

REPEAT STEP 3 TO

STEP 8 FOR

XVARHR, XVAROS

CALIBRATION

STEP 6

Figure 83. Power Offset Calibration Using Line Accumulation

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 ITEST, VNOM, and unity power factor.

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 IMIN, VNOM, and unity power factor.

Step 6: Repeat Step 3 and Step 4.

Step 7: Calculate the value to be written to the xWATTOS

registers according to the following equations.

TEST

MIN

TEST

xWATTHR

Offset

TEST

MIN

–

(52)

[]

CLKIN

AccumTime

Offset

xWATTOS

(53)

where Accumulation Time is defined in Equation 43 and

xWATTHRITEST is the value in the energy register at ITEST, and

xWATTHRIMIN is the value in the energy register at IMIN.

Step 8: Write to all xWATTOS registers (0x39 to 0x3B).

Step 9: Set the test system for ITEST, VNOM, and zero power factor

(calibrate VAR gain).

Step 10: Repeat Steps 3, 4, and 5.

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