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ADE7868AACPZ-RL Datasheet PDF : 96 Pages
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Data Sheet
Polyphase Multifunction
Energy Metering IC
ADE7854A/ADE7858A/ADE7868A/ADE7878A
FEATURES
Highly accurate; supports EN 50470-1, EN 50470-3,
IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
Compatible with 3-phase, 3- or 4-wire (delta or wye) meters,
and other 3-phase services
Supplies total (fundamental and harmonic) active, reactive,
and apparent energy and fundamental active/reactive
energy on each phase and on the overall system
0.1% error (typical) in active and reactive energy over a
dynamic range of 1000 to 1 at TA = 25°C
0.2% error (typical) in active and reactive energy over a
dynamic range of 3000 to 1 at TA = 25°C
Averaged rms measurements available in low ripple rms
registers
Supports current transformer and di/dt current sensors
Dedicated ADC channel for neutral current input
Estimated neutral current measurement by calculating the
rms of the sum of the phase currents in all 3 phases
0.1% error (typical) in voltage and current rms over a
dynamic range of 1000 to 1 at TA = 25°C
Supplies sampled waveform data on all 3 phases and on
neutral current
Selectable no load thresholds for total and fundamental
active and reactive powers, as well as for apparent powers
Highly accurate low power battery mode phase current
monitoring for antitampering detection
Battery supply input for missing neutral operation
Phase angle measurements in current and voltage channels
Calibration frequency (CF) output directly drives LED and
opto-isolators
Reference: 1.2 V (drift of ±5 ppm/°C typical) with external
overdrive capability
Single 3.3 V supply
40-lead, Pb-free lead frame chip scale package (LFCSP)
Operating temperature: −40°C to +85°C
Flexible I2C, SPI, and HSDC serial interfaces
GENERAL DESCRIPTION
The ADE7854A/ADE7858A/ADE7868A/ADE7878A are high
accuracy, 3-phase electrical energy measurement ICs with serial
interfaces and three flexible pulse outputs. The devices incorporate
second-order Σ-∆ analog-to-digital converters (ADCs), a digital
integrator, reference circuitry, and all signal processing required
to perform total (fundamental and harmonic) active, reactive
(ADE7858A, ADE7868A, and ADE7878A), and apparent energy
measurement and rms calculations.
The ADE7878A can also perform fundamental-only active and
reactive energy measurement and rms calculations. A fixed function
digital signal processor (DSP) executes the signal processing. The
DSP program is stored in the internal ROM memory.
The ADE7854A/ADE7858A/ADE7868A/ADE7878A can
measure active, reactive, and apparent energy in various 3-phase
configurations, such as wye or delta services, with both three and
four wires. Aside from regular rms measurements, which are
updated every 8 kHz, these devices measure low ripple rms values,
which are averaged internally and updated every 1.024 sec. The
devices provide system calibration features for each phase, that
is, rms offset correction, phase calibration, and gain calibration.
The CF1, CF2, and CF3 logic outputs provide a wide selection
of power information. All four devices provide total active and
apparent powers, as well as the sum of the current rms values;
the ADE7858A, ADE7868A, and ADE7878A also provide total
reactive powers; whereas the ADE7878A provides fundamental
active and reactive powers.
The ADE7854A/ADE7858A/ADE7868A/ADE7878A contain
waveform sampling registers that allow access to all ADC outputs.
The devices also incorporate power quality measurements, such
as short duration low or high voltage detection, short duration
high current variation, line voltage period measurement, and
angles between phase voltages and currents.
Two serial interfaces, serial peripheral interface (SPI) and I2C,
can communicate with the devices. A dedicated high speed
interface, the high speed data capture (HSDC) port, can be used
in conjunction with I2C to provide access to the ADC outputs
and real-time power information.
The devices have two interrupt request pins, IRQ0 and IRQ1,
to indicate that an enabled interrupt event has occurred. For the
ADE7868A/ADE7878A, three specially designed low power
modes ensure the continuity of energy accumulation when the
ADE7868A/ADE7878A are in a tampering situation.
Table 1 lists each device and its functions. These devices are
available in 40-lead, Pb-free LFCSP packages.
Table 1. Device Comparison
Part No.
I RMS,
V RMS,
WATT VAR and VA
ADE7854A Yes No Yes
ADE7858A Yes Yes Yes
ADE7868A Yes Yes Yes
ADE7878A Yes Yes Yes
Tamper
Fundamental Detect and
WATT and Low Power
di/dt VAR
Modes
Yes No
No
Yes No
No
Yes No
Yes
Yes Yes
Yes
Rev. C
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