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ADE7880
Current Channel Sampling
The waveform samples of the current channel are taken at the
output of HPF and stored in the 24-bit signed registers, IAWV,
IBWV, ICWV, and INWV at a rate of 8 kSPS. All power and rms
calculations remain uninterrupted during this process. Bit 17
(DREADY) in the STATUS0 register is set when the IAWV, IBWV,
ICWV, and INWV registers are available to be read using the I 2 C
or SPI serial port. Setting Bit 17 (DREADY) in the MASK0
register enables an interrupt to be set when the DREADY flag is
set. See the Digital Signal Processor section for more details on
Bit DREADY.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE7880 work on 32-, 16-, or 8-bit words.
When the IAWV, IBWV, ICWV, and INWV 24-bit signed
registers are read from the ADE7880 , they are transmitted sign
extended to 32 bits. See Figure 44 for details.
Data Sheet
allows for using a different current sensor to measure the neutral
current (for example a current transformer) from the current
sensors used to measure the phase currents (for example di/dt
sensors). The digital integrators are managed by Bit 0 (INTEN) of
the CONFIG register and by Bit 3 (ININTEN) of the CONFIG3
register. Bit 0 (INTEN) of the CONFIG register manages the
integrators in the phase current channels. Bit 3 (ININTEN) of the
CONFIG3 register manages the integrator in the neutral current
channel. When the INTEN bit is 0 (default), all integrators in the
phase current channels are disabled. When INTEN bit is 1, the
integrators in the phase currents datapaths are enabled. When the
ININTEN bit is 0 (default), the integrator in the neutral current
channel is disabled. When the ININTEN bit is 1, the integrator in
the neutral current channel is enabled.
response of the digital integrator.
31
24 23 22
24-BIT SIGNED NUMBER
0
Note that the integrator has a ?20 dB/dec attenuation and
approximately ?90° phase shift. When combined with a di/dt
sensor, the resulting magnitude and phase response should be a
BITS[31:24] ARE
EQUAL TO BIT 23
BIT 23 IS A SIGN BIT
flat gain over the frequency band of interest. However, the di/dt
sensor has a 20 dB/dec gain associated with it and generates sig-
Figure 44. 24-Bit IxWV Register Transmitted as 32-Bit Signed Word
The ADE7880 contains a high speed data capture (HSDC) port
that is specially designed to provide fast access to the waveform
sample registers. See the HSDC Interface section for more details.
di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR
The di/dt sensor detects changes in the magnetic field caused by
the ac current. Figure 45 shows the principle of a di/dt current
sensor.
nificant high frequency noise. At least a second order antialiasing
filter is needed to avoid noise aliasing back in the band of
interest when the ADC is sampling (see the Antialiasing Filter
section).
50
0
–50
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
0.01
0
0.1
1 10
FREQUENCY (Hz)
100
1000
–50
+ EMF (ELECTROMOTIVE FORCE)
– INDUCED BY CHANGES IN
MAGNETIC FLUX DENSITY (di/dt)
Figure 45. Principle of a di/dt Current Sensor
–100
0
500
1000
1500 2000 2500
FREQUENCY (Hz)
3000
3500
4000
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 propor-
tional to the di/dt of the current. The voltage output from the
di/dt current sensor is determined by the mutual inductance
Figure 46. Combined Gain and Phase Response of the
Digital Integrator
The DICOEFF 24-bit signed register is used in the digital
integrator algorithm. At power-up or after a reset, its value is
0x000000. Before turning on the integrator, this register must be
initialized with 0xFFF8000. DICOEFF is not used when the
integrator is turned off and can remain at 0x000000 in that case.
between the current carrying conductor and the di/dt sensor.
Due to the di/dt sensor, the current signal needs to be filtered
before it can be used for power measurement. On each phase and
neutral current datapath, there are built-in digital integrators to
recover the current signal from the di/dt sensor. The digital
integrators placed on the phase currents data paths are independent
of the digital integrator placed in the neutral current data path. This
Rev. A | Page 28 of 104
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