ADE7758ARWZRL【PDF 44/72 页】IC ENERGY METERING 3PHASE 24SOIC

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ADE7758

START

STEP 1

ENABLE APCF AND

VARCF PULSE

OUTPUTS

STEP 1A

SELECT VA FOR

VARCF OUTPUT

STEP 2

CLEAR GAIN REGISTERS:

xWG, xVAG, xVARG

Data Sheet

SELECT VAR

FOR VARCF

OUTPUT

YES

ALL

PHASES VA

AND WATT

GAIN CAL?

NO

STEP 3

SET UP PULSE

OUTPUT FOR

PHASE A, B, OR C

YES

ALL PHASES

VAR GAIN

CALIBRATED?

NO

NO

CFNUM/VARCFNUM

SET TO CALCULATE

VALUES?

YES

STEP 3

STEP 4

STEP 5

END

SET UP PULSE

OUTPUT FOR

PHASE A, B, OR C

SET CFNUM/VARCFNUM

AND CFDEN/VARCFDEN

TO CALCULATED VALUES

SET UP SYSTEM

FOR I TEST , V NOM

PF = 1

STEP 6

SELECT PHASE A,

B, OR C FOR LINE

PERIOD

MEASUREMENT

MEASURE %

ERROR FOR APCF

AND VARCF

STEP 7

NO

VARCFNUM/

VARCFDEN

SET TO CALCULATED

VALUES?

YES

CALCULATE AND

WRITE TO

xWG, xVAG

STEP 4

SET

VARCFNUM/VARCFDEN TO

CALCULATED VALUES

STEP 5

SET UP SYSTEM

FOR I TEST , V NOM

PF = 0, INDUCTIVE

STEP 6

MEASURE %

ERROR FOR

VARCF

STEP 7

CALCULATE AND

WRITE TO xVARG

CALCULATE

VARh/LSB

CONSTANT

Figure 78. Gain Calibration Using Pulse Output

CALCULATE Wh/LSB

AND VAh/LSB

CONSTANTS

Step 1: Enable the pulse output by setting Bit 2 of the OPMODE

register (0x13) to Logic 0. This bit enables both the APCF and

VARCF pulses.

Step 1a: VAR and VA share the VARCF pulse output.

WAVMODE[7], Address (0x15), should be set to choose

between VAR or VA pulses on the output. Setting the bit to

the COMPMODE register (0x16). Setting Bit 2 to Logic 1 and

Bit 3 and Bit 4 to Logic 0 allows only Phase A to be included in

the pulse outputs. Select Phase A, Phase B, or Phase C for a line

period measurement with the FREQSEL[1:0] bits in the MMODE

register (0x14). For example, clearing Bit 1 and Bit 0 selects

Phase A for line period measurement.

Logic 1 selects VA. The default is Logic 0 or VARCF pulse

output.

Step 2: Ensure the xWG/xVARG/xVAG are zero.

Step 3: Disable the Phase B and Phase C contribution to the APCF

and VARCF pulses. This is done by the TERMSEL[2:4] bits of

Rev. E | Page 44 of 72

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