ADE7761B

Rev. 0 | Page 7 of 24

Pin No.

Mnemonic

Description

15

FAULT

This logic output goes active high when a fault or missing neutral condition occurs. A fault is defined as a

defined when the chip is powered up with no voltage at the input. The logic output is reset to 0 when a fault or

missing neutral condition is no longer detected. See the Fault Detection section and the Missing Neutral Mode

section.

16

REVP

This logic output goes logic high when negative power is detected, that is, when the phase angle between the

voltage and current signals is greater than 90°. This output is not latched and is reset when positive power is once

again detected. The output goes high or low at the same time that a pulse is issued on CF.

17

DGND

Digital Ground. This pin provides the ground reference for the digital circuitry in the ADE7761B, that is, multiplier,

filters, and digital-to-frequency converters. This pin should be tied to the digital ground plane of the PCB. The

digital ground plane is the ground reference for all digital circuitry, such as counters (mechanical and digital),

MCUs, and indicator LEDs. For good noise suppression, the analog ground plane should be connected to the digital

ground plane only at the DGND pin.

18

CF

Calibration Frequency Logic Output. The CF logic output, active high, gives instantaneous active power information.

This output is used for operational and calibration purposes. See the Digital-to-Frequency Conversion section.

19, 20

F2, F1

Low Frequency Logic Outputs. F1 and F2 supply average active power information. The logic outputs can be

used to directly drive electromechanical counters and 2-phase stepper motors.