ADE7166ASTZF8 Analog Devices Inc, ADE7166ASTZF8 Datasheet - Page 51

• Manufacturer Part Number: ADE7166ASTZF8
• Description: IC ENERGY METER 1PHASE 64LQFP
• Manufacturer: Analog Devices Inc

Specifications of ADE7166ASTZF8

• Applications: Energy Measurement
• Core Processor: 8052
• Program Memory Type: FLASH (8 kB)
• Controller Series: ADE71xx
• Ram Size: 512 x 8
• Interface: I²C, SPI, UART
• Number Of I /o: 20
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 3.13V To 3.46V, 2.4V To 3.7V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CURRENT
Calibration Concerns
Typically, when a meter is being calibrated, the voltage and
current circuits are separated, as shown in Figure 48. This
means that current passes through only the phase or neutral
circuit. Figure 48 shows current being passed through the phase
circuit. This is the preferred option because the ADE7166/
ADE7169 start billing on the input I
circuit CT is connected to I
current sensors are not perfectly matched, it is important to
match current inputs. The ADE7166/ADE7169 provide a gain
calibration register for I
12-bit, signed, twos complement register that provides a gain
resolution of 0.0244%/LSB.
For calibration, a first measurement should be done on I
setting the SEL_I_CH bits to 0b01 in the CALMODE Register
(0x3D). This measurement should be compared to the
measurement on I
SEL_I_CH bits to 0b10 in the CALMODE Register (0x3D). The
gain error between these two measurements can be evaluated using
The two channels I
–Error(%)/(1 + Error (%)) × 2
matching adjustment is be valid for all energy measurements,
active power, reactive power, I
the ADE7166/ADE7169.
Figure 48. Fault Conditions for Inactive Input Greater Than Active Input
TEST
Error
I
PB
( )
%
240V rms
=
V
Measuremen
PB
AGND
PA
R
0
. Measuring I
A
and I
R
F
PB,
CT
CT
IBGAIN (address 0x1C). IBGAIN is a
Measuremen
PB
PA
can then be matched by writing
I t
( )
in the diagram. Because the
rms
12
R
R
C
B
B
B
F
to the IBGAIN register. This
, and apparent power, made by
PB
−
can be forced by setting
Measuremen
0V
PA
V
A
R
C
I t
R
R
on power-up. The phase
F
T
( )
F
F
A
V
V
N
P
C
C
F
F
I t
I
I
( )
I
PA
PB
N
A
PA
by
Rev. A | Page 51 of 144
di/dt CURRENT SENSOR AND DIGITAL
INTEGRATOR FOR THE ADE7569/ADE7169
A di/dt sensor, a feature available for the AD7569/ADE7169 but
not for the AD7566/ADE7166, detects changes in the magnetic
field caused by ac currents. Figure 49 shows the principle of a
di/dt current sensor.
The flux density of a magnetic field induced by a current is
directly proportional to the magnitude of the current. The
changes in the magnetic flux density passing through a conductor
loop generate an electromotive force (EMF) between the two
ends of the loop. The EMF is a voltage signal that is proportional
to the di/dt of the current. The voltage output from the di/dt
current sensor is determined by the mutual inductance between
the current-carrying conductor and the di/dt sensor. The current
signal needs to be recovered from the di/dt signal before it can
be used. An integrator is therefore necessary to restore the
signal to its original form.
The ADE7569/ADE7169 have a built-in digital integrator to
recover the current signal from the di/dt sensor. The digital
integrator on the current channel is switched off by default when
the ADE7569/ADE7169 are powered up. Setting the INTE bit in
the MODE1 register (0x0B) turns on the integrator. Figure 50 to
Figure 53 show the magnitude and phase response of the digital
integrator.
ADE7566/ADE7569/ADE7166/ADE7169
Figure 50. Combined Gain Response of the Digital Integrator and
–10
–20
–30
–40
–50
10
0
Figure 49. Principle of a di/dt Current Sensor
100
Phase Compensator
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
FREQUENCY (Hz)
+ EMF (ELECTROMOTIVE FORCE)
– INDUCED BY CHANGES IN
MAGNETIC FLUX DENSITY (di/dt)
1000