ADE7758 Analog Devices, ADE7758 Datasheet - Page 43

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

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 Logic
1 selects VA. The default is Logic 0 or VARCF pulse output.
Step 2: Ensure the xWG/xVARG/xVAG are set to Logic 0.
END
YES
VARCFNUM/VARCFDEN TO
STEP 4
CALCULATED VALUES
CALIBRATED?
SELECT VAR
ALL PHASES
FOR VARCF
VAR GAIN
OUTPUT
SET
NO
START
NO
SET TO CALCULATED
STEP 3
PHASE A, B, OR C
SET UP PULSE
OUTPUT FOR
VARCFNUM/
VARCFDEN
VALUES?
Figure 77. Gain Calibration Using Pulse Output
Rev. A | Page 43 of 68
YES
STEP 5
STEP 6
STEP 7
CALCULATE AND
WRITE TO XVARG
SET UP SYSTEM
FOR I
MEASURE %
ERROR FOR
CALCULATE
STEP 4
TO CALCULATED VALUES
kVARh/LSB
CONSTANT
SET CFNUM/VARCFNUM
AND CFDEN/VARCFDEN
VARCF
PF = 0
TEST
YES
, V
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 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.
Step 4: Set APCFNUM(0x45) and APCFDEN(0x46) to the
calculated value to perform a coarse adjustment on the
imp/kWh ratio. For VAR/VA calibration, VARCFNUM (0x47)
and VARCFDEN(0x48) should be set to the calculated value.
The pulse output frequency with one phase at full-scale inputs
STEP 1A
STEP 1
STEP 2
SET GAIN REGISTERS: XWG,
ENABLE CF AND
SELECT VA FOR
VARCF OUTPUT
NOM
XVAG, XVARG TO LOGIC 0
VARCF PULSE
PHASES VA
GAIN CAL?
OUTPUTS
AND WATT
ALL
NO
SET TO CALCULATE
STEP 3
CFNUM/VARCFNUM
PHASE A, B, OR C
NO
SET UP PULSE
OUTPUT FOR
VALUES?
YES
CALCULATE Wh/LSB
STEP 5
STEP 6
STEP 7
ERROR FOR APCF
CALCULATE AND
SET UP SYSTEM
FOR I
AND VAh/LSB
MEASURE %
CONSTANTS
AND VARCF
XWG, XVAG
WRITE TO
PF = 1
TEST
, V
NOM
ADE7758