Polyphase Multifunction
Energy Metering IC
Data Sheet
ADE7854A/ADE7858A/ADE7868A/ADE7878A
The ADE7878A can also perform fundamental-only active and
reactive energy measurement and rms calculations. A fixed function
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
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.
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
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.
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
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.
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
IRQ0
IRQ1
,
The devices have two interrupt request pins,
and
Single 3.3 V supply
to indicate that an enabled interrupt event has occurred. For
40-lead, Pb-free lead frame chip scale package (LFCSP)
Operating temperature: −40°C to +85°C
Flexible I2C, SPI, and HSDC serial interfaces
the ADE7868A/ADE7878A, three specially designed low power
modes ensure the continuity of energy accumulation when the
ADE7868A/ADE7878A are in a tampering situation.
GENERAL DESCRIPTION
Table 1 lists each device and its functions. These devices are
available in 40-lead, Pb-free LFCSP packages.
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-Δ 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.
Table 1. Device Comparison
Tamper
I RMS,
Fundamental Detect and
V RMS,
WATT and
Low Power
Modes
Part No.
WATT VAR and VA di/dt VAR
ADE7854A Yes
ADE7858A Yes
ADE7868A Yes
ADE7878A Yes
No Yes
Yes Yes
Yes Yes
Yes Yes
Yes No
Yes No
Yes No
Yes Yes
No
No
Yes
Yes
Rev. D
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