ADE7756*

Features:

High Accuracy, Supports IEC 687/1036
Less than 0.1% Error over a Dynamic Range of 1000 to 1
An On-Chip User Programmable Threshold for Line Voltage SAG Detection and PSU Supervisory
The ADE7756 Supplies Sampled Waveform Data (20 Bits) and Active Energy (40 Bits)
Digital Power, Phase and Input Offset Calibration
An On-Chip Temperature Sensor (3C Typical after Calibration)
An SPI-Compatible Serial Interface
A Pulse Output with Programmable Frequency
An Interrupt Request Pin (IRQ) and Status Register
        Provide Early Warning of Register Overflow and Other Conditions
Proprietary ADCs and DSP Provide High Accuracy
over Large Variations in Environmental Conditions and Time
Single 5 V Supply, Low Power (25 mW Typical)


Pinout




Specifications

AV_DD to AGND  . . . . . . . . . . . . . . . . . . . . . .   0.3  V to +7 V
DV_DD to DGND  . . . . . . . . . . . . . . . . . . . . . .   0.3 V to +7 V
DV_DD to AVDD  . . . . . . . . . . . . . . . . . . . . . .0.3 V to +0.3 V
Analog Input Voltage to AGND
V_1P, V_1N, V_2P and V_2N  . . . . . . . . . . . . . . . . .    6 V to +6 V
Reference Input Voltage to AGND  . 0.3 V to AV_DD + 0.3 V
Digital Input Voltage to DGND  . . .  0.3 V to DV_DD + 0.3 V
Digital Output Voltage to DGND  . . .0.3 V to DV_DD + 0.3 V
Operating Temperature Range
Industrial (A, B Versions)  . . . . . . . . . . . .  40°C to +85°C
Storage Temperature Range  . . . . . . . .  65°C to +150°C


Description

The ADE7756 is a high-accuracy electrical power measurement IC with a serial interface and a pulse output. The ADE7756 incorporates two second-order sigma-delta ADCs, reference circuitry, temperature sensor, and all the signal processing required to perform active power and energy measurement.

The ADE7756 contains a sampled Waveform register and an Active Energy register capable of holding at least five seconds of accumulated power at full load. Data is read from the ADE7756 via the serial interface. It also provides a pulse output (CF) with a frequency that is proportional to the active power.In addition to real power information, the ADE7756 also provides system calibration features, i.e., channel offset correction, phase calibration, and power calibration.A zero crossing output (ZX) produces an output that is synchronized to the zero crossing point of the line voltage. This output can
be used to extract timing or frequency information from the line. The signal is also used internally to the chip in the calibration mode. This permits faster and more accurate calibration of the real power calculation. This signal is also useful for synchronization of relay switching with a voltage zero crossing, thus improving the relay life by reducing the risk of arcing.