Poly Phase Multifunction Energy Metering IC with per Phase Active and Reactive Powers

The ADE7854 / ADE7858 / ADE7868 / ADE7878 are high accuracy, 3-phase electrical energy measurement ICs with serial interfaces and three flexible pulse outputs. The ADE78xx devices incorporate second-order sigma-delta (Σ-∆) analog-to-digital converters (ADCs), a digital integrator, reference circuitry, and all of the signal processing required to perform total (fundamental and harmonic) active, reactive (ADE7878, ADE7868, and ADE7858), and apparent energy measurement and rms calculations, as well as fundamental-only active and reactive energy measurement (ADE7878) and rms calculations. A fixed function digital signal processor (DSP) executes this signal processing. The DSP program is stored in the internal ROM memory.

The ADE7854 / ADE7858 / ADE7868 / ADE7878 are suitable for measuring active, reactive, and apparent energy in various 3-phase configurations, such as wye or delta services, with both three and four wires. The ADE78xx 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 choice of power information: total active, reactive, and apparent powers, or the sum of the current rms values, and fundamental active and reactive powers.

The ADE7854 / ADE7858 / ADE7868 / ADE7878 contain waveform sample registers that allow access to all ADC outputs. The devices also incorporate 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, SPI and I2C, can be used to communicate with the ADE78xx. 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 ADE7854 / ADE7858 / ADE7868 / ADE7878 also have two interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled interrupt event has occurred. For the ADE7868 / ADE7878, three specially designed low power modes ensure the continuity of energy accumulation when the ADE7868 / ADE7878 is in a tampering situation.

APPLICATIONS

* Energy metering systems

* 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), and other 3-phase services

* Supplies total (fundamental and harmonic) active, reactive (ADE7878, ADE7868, and ADE7858 only), and apparent energy, and fundamental active/reactive energy (ADE7878 only) 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 TA = 25°C

* Less than 0.2% error in active and reactive energy over a dynamic range of 3000 to 1 at TA = 25°C

* Supports current transformer and di/dt current sensors

* Dedicated ADC channel for neutral current input (ADE7868 and ADE7878 only)

* Less than 0.1% error in voltage and current rms over a dynamic range of 1000 to 1 at TA = 25°C