ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 46

• Manufacturer Part Number: ADE7753ARSZ
• Description: IC ENERGY METERING 1PHASE 20SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7753ARSZ

• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 3mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP (0.200", 5.30mm Width)
• Meter Type: Single Phase
• Ic Function: Single-Phase Multifunction Metering IC
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADE7753ZEB - BOARD EVALUATION AD7753
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADE7753
Reactive Energy
Reactive energy is only available in line accumulation mode in
the ADE7753. The accumulated reactive energy over LINECYC
number of half line cycles is stored in the LVARENERGY register.
In the ADE7753, a low-pass filter at 2 Hz on the current channel
is implemented for the reactive power calculation. This provides
the 90 degree phase shift needed to calculate the reactive power.
This filter introduces 1/f attenuation in the reactive energy
accumulated. Compensation for this attenuation can be done
externally in a microcontroller. The microcontroller can use the
LVARENERGY register in order to produce a pulse output
similar to the CF pulse for reactive energy.
SET HALF LINE CYCLES FOR ACCUMULATION
WRITE CFDEN VALUE TO CFDEN REGISTER
CALCULATE CFDEN VALUE FOR DESIGN
CALCULATE VAGAIN. SEE EQUATION 69.
CALCULATE WGAIN. SEE EQUATION 47.
ENABLE LINE CYCLE ACCUMULATION
ACCUMULATION ADDR. 0x09 = 0x0080
READ LINE ACCUMULATION ENERGY
SET I
IN LINECYC REGISTER ADDR. 0x1C
APPARAENT ENERGY: ADDR. 0x07
RESET THE INTERRUPT STATUS
RESET THE INTERRUPT STATUS
INTERRUPT ADDR. 0x0A = 0x04
READ REGISTER ADDR. = 0x0C
READ REGISTER ADDR. = 0x0C
ACTIVE ENERGY: ADDR. 0x04
SET MODE FOR LINE CYCLE
TEST
ADDR. 0x15 = CFDEN
= I
INTERRUPT?
INTERRUPT?
YES
YES
b
, V
Figure 87. Active/Apparent Gain Calibration
TEST
= V
NOM
Rev. A | Page 46 of 60
, PF = 1
NO
NO
To create a VAR pulse, an impulse/VARh constant must be
determined. The 1/f attenuation correction factor is determined
by comparing the nominal reactive energy accumulation rate to
the expected value. The attenuation correction factor is multi-
plied by the contents of the LVARENERGY register, with the
ADE7753 in line accumulation mode.
WRITE WGAIN VALUE TO ADDR. 0x12
WRITE VGAIN VALUE TO ADDR. 0x1A
02875-A-004