ADE7758ARWZ Analog Devices Inc, ADE7758ARWZ Datasheet - Page 47

• Manufacturer Part Number: ADE7758ARWZ
• Description: IC ENERGY METERING 3PHASE 24SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADE7758ARWZ

• Input Impedance: 380 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 8mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Meter Type: 3 Phase
• Ic Function: Poly Phase Multifunction Energy Metering IC
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOIC
• No. Of Pins: 24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Step 1: Repeat Step 1 and Step 3 from the gain calibration to
configure the ADE7758 pulse output.
Step 2: Clear the xWATTOS and xVAROS registers.
Step3: 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. 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.
END
YES
STEP 7.
REPEAT STEP
3 TO STEP 6
FOR xVAROS
CALIBRATED?
ALL PHASES
VAR OFFSET
Figure 79. Offset Calibration Using Pulse Output
ERROR FOR VARCF
STEP 3
STEP 4
STEP 5
STEP 6
MEASURE PERIOD
PF = 0, INDUCTIVE
USING FREQ[11:0]
FOR LINE PERIOD
FREQ[11:0] FOR A
FOR PHASE A, B,
CALCULATE AND
SET UP SYSTEM
PULSE OUTPUT
MEASUREMENT
MEASUREMENT
FOR I
SELECT PHASE
SET UP VARCF
NO
START
LINE PERIOD
MEASURE %
CONFIGURE
REGISTER
WRITE TO
Rev. D | Page 47 of 72
xVAROS
OR C
MIN
, V
NOM
YES
,
Step 4: Set the test system for I
For Step 6, set the test system for I
factor inductive.
Step 5: Measure the percent error in the pulse output, APCF or
VARCF, from the reference meter using Equation 49.
Step 6: Calculate xWATTOS using Equation 56 (for xVAROS
use Equation 57).
STEP 1
STEP 2
xWATTOS, xVAROS
CLEAR OFFSET
WATT OFFSET
CALIBRATED?
ENABLE CF
REGISTERS
ALL PHASES
OUTPUTS
–
xWATTOS
⎛
⎜
⎝
%APCF
100
%
ERROR
=
STEP 3
STEP 4
STEP 5
STEP 6
FOR PHASE A, B,
CALCULATE AND
SET UP SYSTEM
PULSE OUTPUT
FOR I
NO
×
SET UP APCF
MEASURE %
ERROR FOR
WRITE TO
xWATTOS
APCF
PF = 1
APCF
OR C
MIN
, V
EXPECTED
NOM
MIN
,
, V
MIN
NOM
, V
⎞
⎟
⎠
×
, and unity power factor.
NOM
2
Q
4
, and zero-power
×
APCFNUM
APCFDEN
ADE7758
(56)