ADE7758 datasheet(4/68 Pages) AD

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ADE7758

Rev. A | Page 4 of 68

GENERAL DESCRIPTION

(Continued from Page 1)

The ADE7758 has a waveform sample register that allows access

to the ADC outputs. The part also incorporates a detection circuit

for short duration low or high voltage variations. The voltage

threshold levels and the duration (number of half-line cycles) of

the variation are user programmable. A zero-crossing detection

is synchronized with the zero-crossing point of the line voltage

of any of the three phases. This information can be used to

measure the period of any one of the three voltage inputs. It is

also used internally to the chip in the line cycle energy accu-

mulation mode. This mode permits faster and more accurate

calibration by synchronizing the energy accumulation with an

integer number of line cycles.

Data is read from the ADE7758 via the SPI serial interface. The

interrupt request output (IRQ) is an open-drain, active low

logic output. The IRQ output goes active low when one or more

interrupt events have occurred in the ADE7758. A status register

indicates the nature of the interrupt. The ADE7758 is available

in a 24-lead SOIC package.

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