ADE7858 Datasheet, PDF (1/76 Pages) Analog Devices – Poly Phase Multifunction Energy Metering IC with per Phase Active and Reactive Powers

Poly Phase Multifunction Energy Metering IC
with per Phase Active and Reactive Powers
Preliminary Technical Data
ADE7858
FEATURES
Highly accurate; supports EN 50470-1, EN 50470-3,
IEC 62053-21, IEC 62053-22 and IEC 62053-23
Compatible with 3-phase, 3 or 4 wire (delta or wye) and
other 3-phase services
Supplies total (fundamental and harmonic) active/reactive/
apparent energy on each phase and on the overall system
Less than 0.1% error in active and reactive energy over a
dynamic range of 1000 to 1 at 25°C
Less than 0.2% error in active and reactive energy over a
dynamic range of 3000 to 1 at 25°C
Supports current transformer and di/dt current sensors
Less than 0.1% error in voltage and current rms over a
dynamic range of 1000 to 1 at 25°C
Supplies sampled waveform data on all 3 phases
Selectable No-load threshold level for total active, reactive
and apparent powers
Phase angle measurements in both current and voltage
channels with max 0.3° error
Wide supply voltage operation 2.4 to 3.7V
Reference 1.2 V (drift 10 ppm/°C typ) with external
overdrive capability
Single 3.3 V supply
40-Lead Frame Chip Scale (LFCSP) Lead Free Package
Operating temperature -40° to 85°C
Flexible I²C, SPI®, HSDC serial interfaces
GENERAL DESCRIPTION
The ADE7858¹ is a high accuracy, 3-phase electrical energy
measurement IC with serial interfaces and three flexible pulse
outputs. The ADE7858 incorporates second-order Σ-Δ ADCs, a
digital integrator, reference circuitry, and all the signal
processing required to perform total (fundamental and
harmonic) active, reactive and apparent energy measurement,
and rms calculations. A fixed function digital signal processor
(DSP) executes this signal processing.
The ADE7858 is suitable to measure active, reactive, and
apparent energy in various 3-phase configurations, such as
WYE or DELTA services, with both three and four wires. The
ADE7858 provides 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
choice of power information: total active/reactive/apparent
power or sum of current rms values.
The ADE7858 has waveform sample registers that allow access
to all ADC outputs. The device also incorporates power quality
measurements such as short duration low or high voltage
detections, short duration high current variations, line voltage
period measurement and angles between phase voltages and
currents. Two serial interfaces can be used to communicate with
the ADE7858: SPI or I²C while a dedicated high speed interface,
HSDC (High Speed Data Capture) port, can be used in
conjunction with I²C to provide access to the ADC outputs and
real time power information. The ADE7858 has also two
interrupt request pins, IRQ0 and IRQ1 , to indicate that an
enabled interrupt event has occurred.
The ADE7858 is available in 40-lead LFCSP lead free package.
1 _{U.S. patents pending.}
Rev. PrA
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