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ADE7566/ADE7569
Preliminary Technical Data
HPF
V2
V P
V N
×1, ×2, ×4,
×8, ×16
{GAIN[7:5]}
PGA2
REFERENCE
ADC
ACTIVE AND REACTIVE
POWER CALCULATION
VOLTAGE RMS (V rms)
CALCULATION
WAVEFORM SAMPLE
REGISTER
VOLTAGE PEAK DETECT
V2
0.5V, 0.25V,
0.125V, 62.5mV,
31.3mV
0V
ANALOG
INPUT
RANGE
0x28F5
VOLTAGE CHANNEL
WAVEFORM
DATA RANGE
LPF1
f –3dB = 63.7Hz
MODE1[6]
ZX DETECTION
ZX SIGNAL
DATA RANGE FOR 60Hz SIGNAL
0x1DD0
0x0000
0x0000
0xE230
0xD70B
ZX SIGNAL
DATA RANGE FOR 50Hz SIGNAL
0x2037
0x0000
0xDFC9
*WHEN DIGITAL INTEGRATOR IS ENABLED, FULL-SCALE OUTPUT DATA IS ATTENUATED
DEPENDING ON THE SIGNAL FREQUENCY BECAUSE THE INTEGRATOR HAS A –20dB/DECADE
FREQUENCY RESPONSE. WHEN DISABLED, THE OUTPUT WILL NOT BE FURTHER ATTENUATED.
Figure 36. ADC and Signal Processing in Voltage Channel
Voltage Channel ADC
Figure 36 shows the ADC and signal processing chain for the
voltage channel. In waveform sampling mode, the ADC outputs
a signed, twos complement, 24-bit data-word at a maximum
of 25.6 kSPS (MCLK/160). The ADC produces an output code
that is approximately between 0x28F5 (+10,485d) and 0xD70B
(?10,485d).
Channel Sampling
The waveform samples of the current ADC and voltage ADC
can also be routed to the waveform registers to be read by the
MCU core. The active, reactive, apparent power, and energy
calculation remain uninterrupted during waveform sampling.
When in waveform sampling mode, one of four output sample
rates can be chosen by using Bits DTRT[1:0] of the WAVMODE
register (see Table 32 ) . The output sample rate can be 25.6 kSPS,
12.8 kSPS, 6.4 kSPS, or 3.2 kSPS. If the WFSM enable bit is set
in the Interrupt Enable Register 3 SFR (MIRQENH, 0xDB), the
8052 core has a pending ADE interrupt. The sampled signals
selected in the WAVMODE register are latched into the
Waveform SFRs when the waveform high byte (WAV1H or
WAV2H) is read.
The ADE interrupt stays active until the WFSM status bit is
cleared (see the Energy Measurement Interrupts section).
di/dt CURRENT SENSOR AND DIGITAL
INTEGRATOR FOR THE ADE7569
A di/dt sensor, a feature available for the AD7569, but not for
the AD7566, detects changes in the magnetic field caused by ac-
currents. Figure 37 shows the principle of a di/dt current sensor.
MAGNETIC FIELD CREATED BY CURRENT
(DIRECTLY PROPORTIONAL TO CURRENT)
+ EMF (ELECTROMOTIVE FORCE)
– INDUCED BY CHANGES IN
MAGNETIC FLUX DENSITY (di/dt)
Figure 37. 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.
Rev. PrA | Page 44 of 136
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